IDT72V51346 - Integrated Device Technology, Inc.

2003 Integrated Device Technology, Inc.

JUNE 2003

IDT and the IDT logo are registered trademarks of Integrated Device Technology, Inc

COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES

3.3V MULTI-QUEUE FLOW-CONTROL DEVICES

(8 QUEUES) 36 BIT WIDE CONFIGURATION

589,824 bits

1,179,648 bits

2,359,296 bits

IDT72V51336

IDT72V51346

IDT72V51356

FEATURES:

••

•Choose from among the following memory density options:

IDT72V51336 



Total Available Memory = 589,824 bits

IDT72V51346 



Total Available Memory = 1,179,648 bits

IDT72V51356 



Total Available Memory = 2,359,296 bits

••

•Configurable from 1 to 8 Queues

••

•Queues may be configured at master reset from the pool of

Total Available Memory in blocks of 256 x 36

••

•Independent Read and Write access per queue

••

•User programmable via serial port

••

•Default multi-queue device configurations

-IDT72V51336: 2,048 x 36 x 8Q

-IDT72V51346: 4,096 x 36 x 8Q

-IDT72V51356: 8,192 x 36 x 8Q

••

•100% Bus Utilization, Read and Write on every clock cycle

••

•166 MHz High speed operation (6ns cycle time)

••

•3.7ns access time

••

•Individual, Active queue flags (OV, FF, PAE, PAF, PR)

••

•8 bit parallel flag status on both read and write ports

••

•Provides continuous PAE and PAF status of up to 8 Queues

••

•Global Bus Matching - (All Queues have same Input Bus Width

and Output Bus Width)

••

•User Selectable Bus Matching Options:

- x36in to x36out

- x18in to x36out

- x9in to x36out

- x36in to x18out

- x36in to x9out

••

•FWFT mode of operation on read port

••

•Packet mode operation

••

•Partial Reset, clears data in single Queue

••

•Expansion of up to 8 multi-queue devices in parallel is available

••

•JTAG Functionality (Boundary Scan)

••

•Available in a 256-pin PBGA, 1mm pitch, 17mm x 17mm

••

•HIGH Performance submicron CMOS technology

••

•Industrial temperature range (-40°C to +85°C) is available

MULTI-QUEUE FLOW-CONTROL DEVICE

FSTR

WEN

PAF

WRADD 6

WCLK

PAFn

x9, x18, x36

DATA IN

REN

PAE

RDADD

ESTR

RCLK

PAEn/PRn

x9, x18, x36

DATA OUT

WRITE CONTROL

Din Qout

READ CONTROL

WRITE FLAGS

READ FLAGS

5936 drw01

WADEN RADEN

FUNCTIONAL BLOCK DIAGRAM

IDT72V51336/72V51346/72V51356 3.3V, MULTI-QUEUE FLOW-CONTROL DEVICES

(8 QUEUES) 36 BIT WIDE CONFIGURATION 589,824, 1,179,648 and 2,359,296 bits

COMMERCIAL AND INDUSTRIAL

TEMPERATURE RANGES

DESCRIPTION:

The IDT72V51336/72V51346/72V51356 multi-queue flow-control de-

vices are single chip within which anywhere between 1 and 8 discrete FIFO

queues can be setup. All queues within the device have a common data input

bus, (write port) and a common data output bus, (read port). Data written into

the write port is directed to a respective queue via an internal de-multiplex

operation, addressed by the user. Data read from the read port is accessed

from a respective queue via an internal multiplex operation, addressed by

the user. Data writes and reads can be performed at high speeds up to

166MHz, with access times of 3.7ns. Data write and read operations are totally

independent of each other, a queue maybe selected on the write port and

a different queue on the read port or both ports may select the same queue

simultaneously.

The device provides Full flag and Output Valid flag status for the queue

selected for write and read operations respectively. Also a Programmable

Almost Full and Programmable Almost Empty flag for each queue is provided.

Two 8 bit programmable flag busses are available, providing status of all

queues, including queues not selected for write or read operations, these flag

busses provide an individual flag per queue.

Bus Matching is available on this device, either port can be 9 bits, 18 bits

or 36 bits wide provided that at least one port is 36 bits wide. When Bus

Matching is used the device ensures the logical transfer of data throughput

in a Little Endian manner.

A packet mode of operation is also provided when the device is configured

for 36 bit input and 36 bit output port sizes. The Packet mode provides the user

with a flag output indicating when at least one (or more) packets of data within a

queue is available for reading. The Packet Ready provides the user with a means

by which to mark the start and end of packets of data being passed through the

queues. The multi-queue device then provides the user with an internally

generated packet ready status per queue.

The user has full flexibility configuring queues within the device, being able

to program the total number of queues between 1 and 8, the individual queue

depths being independent of each other. The programmable flag positions are

also user programmable. All programming is done via a dedicated serial port.

If the user does not wish to program the multi-queue device, a default option is

available that configures the device in a predetermined manner.

Both Master Reset and Partial Reset pins are provided on this device. A Master

Reset latches in all configuration setup pins and must be performed before

programming of the device can take place. A Partial Reset will reset the read and

write pointers of an individual queue, provided that the queue is selected on both

the write port and read port at the time of partial reset.

A JTAG test port is provided, here the multi-queue flow-control device has a

fully functional Boundary Scan feature, compliant with IEEE 1149.1 Standard

Test Access Port and Boundary Scan Architecture.

See Figure 1, Multi-Queue Flow-Control Device Block Diagram for an outline

of the functional blocks within the device.

COMMERCIAL AND INDUSTRIAL

TEMPERATURE RANGES

IDT72V51336/72V51346/72V51356 3.3V, MULTI-QUEUE FLOW-CONTROL DEVICES

(8 QUEUES) 36 BIT WIDE CONFIGURATION 589,824, 1,179,648 and 2,359,296 bits

x9, x18, x36

Qout

OUTPUT

Q0 - Q35

WRADD

WADEN

INPUT

DEMUX

WCLK WEN

Write Control

Logic

Din

Write Pointers

Active Q

Flags

PAF

General Flag

Monitor

FSTR

PAFn

FSYNC

PAF

Reset

Logic

Serial

Multi-Queue

Programming

PAE/ PAF

Offset

TMS

TDI

TDO

TCK

TRST

PRS

MRS

SCLK

SENI

RCLK

REN

Read Control

Logic

Read Pointers

Active Q

Flags

PAE

General Flag

Monitor ESTR

ESYNC

RDADD

RADEN

FXO

FXI

EXI

EXO

5936 drw02

x9, x18, x36

ID0

ID1

ID2

Device ID

3 Bit

PKT

Packet Mode

Logic

JTAG

Logic

D35 = TEOP

D34 = TSOP

Q35 = REOP

Q34 = RSOP

PRn/PAEn

SENO

DFM

MAST

PAE

Upto 8

FIFO

Queues

0.5 Mbit

1.1 Mbit

2.3 Mbit

Dual Port

Memory

OUTPUT

MUX

D0 - D35

Figure 1. Multi-Queue Flow-Control Device Block Diagram

IDT72V51336/72V51346/72V51356 3.3V, MULTI-QUEUE FLOW-CONTROL DEVICES

(8 QUEUES) 36 BIT WIDE CONFIGURATION 589,824, 1,179,648 and 2,359,296 bits

COMMERCIAL AND INDUSTRIAL

TEMPERATURE RANGES

D14

D13 D12 D10 Q9D7 Q6D4 Q3D1 ID1TCK TDO Q12 Q14 Q15

D15

D16 D11 D9 Q8D6 Q5D3 Q2D0 ID0TMS TDI Q11 Q13 Q19

D17

D18 D19 D8 Q7

D5 Q4D2 Q1

TRST Q0

GND ID2 Q10 Q17 Q18

D20

D21 D22 VCC VCC

VCC VCCVCC VCC

VCC VCC

VCC VCC Q16 Q21 Q20

D23

D24 D25 VCC VCC

VCC VCCVCC VCCVCC VCCGND GND Q24 Q23 Q22

D26

D27 D28 VCC VCCVCC VCCGND GNDGND GNDGND GND Q27 Q26 Q25

D29

D30 D31 VCC VCCVCC VCCGND GNDGND GNDGND GND Q30 Q29 Q28

D32

D33 D34 VCC VCC

GND GNDGND GNDGND GNDGND GND Q33 Q32 Q31

GND

GND D35 VCC VCCGND GNDGND GNDGND GNDGND GND PKT Q35 Q34

GND

GND VCC VCCVCC VCC

GND GNDGND GNDGND GND GND MAST FM

DFM DF VCC VCCVCC VCCGND GNDGND GNDGND GND BM IW OW

SENO

SENI SO VCC VCCVCC VCCVCC VCCVCC VCCGND GND OE RDADD0 RDADD1

WRADD1

WRADD0 SCLK VCC VCCVCC VCCVCC VCCVCC VCCVCC VCC RDADD2 RDADD3 GND

GND

GND WRADD2 WADEN PAE3PAF3PAE6PAF6PAE7PAF7PAE

FF OV RDADD4 RDADD5 RDADD6

WRADD4

WRADD3 FSYNC FSTR PAE2PAF2PAE5PAF5 DNCPAF4 DNC

PAF PR RADEN ESTR ESYNC

WRADD5

FXI FXO PAF0PAE1PAF1PAE4

WEN REN

WCLK RCLK

PRS MRS PAE0

12 3 4 135126117108 9 14 15 16

5936 drw03

A1 BALL PAD CORNER

EXO EXI

GND

PIN CONFIGURATION

PBGA (BB256-1, order code: BB)

TOP VIEW

NOTE:

1. DNC - Do Not Connect.

COMMERCIAL AND INDUSTRIAL

TEMPERATURE RANGES

IDT72V51336/72V51346/72V51356 3.3V, MULTI-QUEUE FLOW-CONTROL DEVICES

(8 QUEUES) 36 BIT WIDE CONFIGURATION 589,824, 1,179,648 and 2,359,296 bits

DETAILED DESCRIPTION

MULTI-QUEUE STRUCTURE

The IDT multi-queue flow-control device has a single data input port and

single data output port with up to 8 FIFO queues in parallel buffering between

the two ports. The user can setup between 1 and 8 Queues within the device.

These queues can be configured to utilize the total available memory, providing

the user with full flexibility and ability to configure the queues to be various depths,

independent of one another.

MEMORY ORGANIZATION/ ALLOCATION

The memory is organized into what is known as “blocks”, each block being

256 x36 bits. When the user is configuring the number of queues and individual

queue sizes the user must allocate the memory to respective queues, in units

of blocks, that is, a single queue can be made up from 0 to m blocks, where m

is the total number of blocks available within a device. Also the total size of any

given queue must be in increments of 256 x36. For the IDT72V51336/

72V51346 and IDT72V51356 the Total Available Memory is 64, 128 and 256

blocks respectively (a block being 256 x36). Queues can be built from these

blocks to make any size queue desired and any number of queues desired.

BUS WIDTHS

The input port is common to all queues within the device, as is the output port.

The device provides the user with Bus Matching options such that the input port

and output port can be either x9, x18 or x36 bits wide provided that at least one

of the ports is x36 bits wide, the read and write port widths being set

independently of one another. Because the ports are common to all queues the

width of the queues is not individually set, so that the input width of all queues

are equal and the output width of all queues are equal.

WRITING TO & READING FROM THE MULTI-QUEUE

Data being written into the device via the input port is directed to a discrete

queue via the write queue select address inputs. Conversely, data being read

from the device read port is read from a queue selected via the read queue select

address inputs. Data can be simultaneously written into and read from the same

queue or different queues. Once a queue is selected for data writes or reads,

the writing and reading operation is performed in the same manner as

conventional IDT synchronous FIFO, utilizing clocks and enables, there is a

single clock and enable per port. When a specific queue is addressed on the

write port, data placed on the data inputs is written to that queue sequentially

based on the rising edge of a write clock provided setup and hold times are met.

Conversely, data is read on to the output port after an access time from a rising

edge on a read clock.

The operation of the write port is comparable to the function of a conventional

FIFO operating in standard IDT mode. Write operations can be performed on

the write port provided that the queue currently selected is not full, a full flag output

provides status of the selected queue. The operation of the read port is

comparable to the function of a conventional FIFO operating in FWFT mode.

When a queue is selected on the output port, the next word in that queue will

automatically fall through to the output register. All subsequent words from that

queue require an enabled read cycle. Data cannot be read from a selected

queue if that queue is empty, the read port provides an Output Valid flag indicating

when data read out is valid. If the user switches to a queue that is empty, the

last word from the previous queue will remain on the output register.

As mentioned, the write port has a full flag, providing full status of the selected

queue. Along with the full flag a dedicated almost full flag is provided, this almost

full flag is similar to the almost full flag of a conventional IDT FIFO. The device

provides a user programmable almost full flag for all 8 queues and when a

respective queue is selected on the write port, the almost full flag provides status

for that queue. Conversely, the read port has an output valid flag, providing

status of the data being read from the queue selected on the read port. As well

as the output valid flag the device provides a dedicated almost empty flag. This

almost empty flag is similar to the almost empty flag of a conventional IDT FIFO.

The device provides a user programmable almost empty flag for all 4 queues

and when a respective queue is selected on the read port, the almost empty flag

provides status for that queue.

PROGRAMMABLE FLAG BUSSES

In addition to these dedicated flags, full & almost full on the write port and output

valid & almost empty on the read port, there are two flag status busses. An almost

full flag status bus is provided, this bus is 8 bits wide. Also, an almost empty flag

status bus is provided, again this bus is 8 bits wide. The purpose of these flag

busses is to provide the user with a means by which to monitor the data levels

within queues that may not be selected on the write or read port. As mentioned,

the device provides almost full and almost empty registers (programmable by

the user) for each of the 8 queues in the device.

The 4 bit PAEn and 4 bit PAFn busses provide a discrete status of the Almost

Empty and Almost Full conditions of all 8 queue's. If the device is programmed

for less than 8 queue's, then there will be a corresponding number of active

outputs on the PAEn and PAFn busses.

The flag busses can provide a continuous status of all queues. If devices are

connected in expansion mode the individual flag busses can be left in a discrete

form, providing constant status of all queues, or the busses of individual devices

can be connected together to produce a single bus of 8 bits. The device can

then operate in a "Polled" or "Direct" mode.

When operating in polled mode the flag bus provides status of each device

sequentially, that is, on each rising edge of a clock the flag bus is updated to show

the status of each device in order. The rising edge of the write clock will update

the Almost Full bus and a rising edge on the read clock will update the Almost

Empty bus.

When operating in direct mode the device driving the flag bus is selected by

the user. The user addresses the device that will take control of a respective

flag bus, these PAFn and PAEn flag busses operating independently of one

another. Addressing of the Almost Full flag bus is done via the write port and

addressing of the Almost Empty flag bus is done via the read port.

PACKET MODE

The multi-queue flow-control device also offers a “Packet Mode” operation.

Packet Mode is user selectable and requires the device to be configured with

both write and read ports as 36 bits wide. In packet mode, users can define

the length of packets or frame by using the two most significant bits of the 36-

bit word. Bit 34 is used to mark the Start of Packet (SOP) and bit 35 is used to

mark the End of Packet (EOP) as shown in Table 5). When writing data into

a given queue, the first word being written is marked, by the user setting bit 34

as the “Start of Packet” (SOP) and the last word written is marked as the “End

of Packet” (EOP) with all words written between the Start of Packet (SOP)

marker (bit 34) and the End of packet (EOP) packet marker (bit 35) constituting

the entire packet. A packet can be any length the user desires, up to the total

available memory in the multi-queue flow-control device. The device monitors

the SOP (bit 34) and looks for the word that contains the EOP (bit 35). The read

port is supplied with an additional status flag, “Packet Ready”. The Packet

Ready (PR) flag in conjunction with Output Valid (OV) indicates when at least

one packet is available to read. When in packet mode the almost empty flag

status, provides packet ready flag status for individual queues.

IDT72V51336/72V51346/72V51356 3.3V, MULTI-QUEUE FLOW-CONTROL DEVICES

(8 QUEUES) 36 BIT WIDE CONFIGURATION 589,824, 1,179,648 and 2,359,296 bits

COMMERCIAL AND INDUSTRIAL

TEMPERATURE RANGES

EXPANSION

Expansion of multi-queue devices is also possible, up to 8 devices can be

connected in a parallel fashion providing the possibility of both depth expansion

or queue expansion. Depth Expansion means expanding the depths of

individual queues. Queue expansion means increasing the total number of

queues available. Depth expansion is possible by virtue of the fact that more

memory blocks within a multi-queue device can be allocated to increase the

depth of a queue. For example, depth expansion of 8 devices provides the

possibility of 8 queues of 64K x36 deep, each queue being setup within a single

device utilizing all memory blocks available to produce a single queue. This is

the deepest queue that can setup within a device.

For queue expansion of the 8 queue device, a maximum number of 64 (8 x 8)

queues may be setup, each queue being 2K x36 deep, if less queues are setup,

then more memory blocks will be available to increase queue depths if desired.

When connecting multi-queue devices in expansion mode all respective input

pins (data & control) and output pins (data & flags), should be “connected”

together between individual devices.

COMMERCIAL AND INDUSTRIAL

TEMPERATURE RANGES

IDT72V51336/72V51346/72V51356 3.3V, MULTI-QUEUE FLOW-CONTROL DEVICES

(8 QUEUES) 36 BIT WIDE CONFIGURATION 589,824, 1,179,648 and 2,359,296 bits

BM Bus Matching LVTTL This pin is setup before Master Reset and must not toggle during any device operation. This pin is used

INPUT along with IW and OW to setup the multi-queue flow-control device bus width. Please refer to Table 3

for details.

D[35:0] Data Input Bus LVTTL These are the 36 data input pins. Data is written into the device via these input pins on the rising edge

Din INPUT of WCLK provided that WEN is LOW. Note, that in Packet mode D32-D35 may be used as packet

markers, please see packet ready functional discussion for more detail. Due to bus matching not all inputs

may be used, any unused inputs should be tied LOW.

DF(1) Default Flag LVTTL If the user requires default programming of the multi-queue device, this pin must be setup before Master

INPUT Reset and must not toggle during any device operation. The state of this input at master reset determines

the value of the PAE/PAF flag offsets. If DF is LOW the value is 8, if DF is HIGH the value is 128.

DFM(1) Default Mode LVTTL The multi-queue device requires programming after master reset. The user can do this serially via the

INPUT serial port, or the user can use the default method. If DFM is LOW at master reset then serial mode will be

selected, if HIGH then default mode is selected.

ESTR PAEn Flag Bus LVTTL If direct operation of the PAEn bus has been selected, the ESTR input is used in conjunction with RCLK

Strobe INPUT and the RDADD bus to select a device for its queues to be placed on to the PAEn bus outputs. A device

addressed via the RDADD bus is selected on the rising edge of RCLK provided that ESTR is HIGH. If

Polled operations has been selected, ESTR should be tied inactive, LOW. Note, that a PAEn flag bus

selection cannot be made, (ESTR must NOT go active) until programming of the part has been completed

and SENO has gone LOW.

ESYNC PAEn Bus Sync LVTTL ESYNC is an output from the multi-queue device that provides a synchronizing pulse for the PAEn bus

OUTPUT during Polled operation of the PAEn bus. During Polled operation each devices queue status flags are

loaded on to the PAEn bus outputs sequentially based on RCLK. The first RCLK rising edge loads device 1

on to PAEn, the second RCLK rising edge loads device 2 and so on. During the RCLK cycle that a selected

device is placed on to the PAEn bus, the ESYNC output will be HIGH.

EXI PAEn/PRn Bus LVTTL The EXI input is used when multi-queue devices are connected in expansion mode and Polled PAEn/

Expansion In INPUT PRn bus operation has been selected . EXI of device ‘N’ connects directly to EXO of device ‘N-1’. The

EXI receives a token from the previous device in a chain. In single device mode the EXI input must be

tied LOW if the PAEn/PRn bus is operated in direct mode. If the PAEn/PRn bus is operated in polled mode

the EXI input must be connected to the EXO output of the same device. In expansion mode the EXI of

the first device should be tied LOW, when direct mode is selected.

EXO PAEn/PRn Bus LVTTL EXO is an output that is used when multi-queue devices are connected in expansion mode and Polled

Expansion Out OUTPUT PAEn/PRn bus operation has been selected . EXO of device ‘N’ connects directly to EXI of device ‘N+1’.

This pin pulses HIGH when device N places its PAE status on to the PAEn/PRn bus with respect to RCLK.

This pulse (token) is then passed on to the next device in the chain ‘N+1’ and on the next RCLK rising

edge the first quadrant of device N+1 will be loaded on to the PAEn/PRn bus. This continues through the

chain and EXO of the last device is then looped back to EXI of the first device. The ESYNC output of each

device in the chain provides synchronization to the user of this looping event.

FF Full Flag LVTTL This pin provides the full flag output for the active queue, that is, the queue selected on the input port

OUTPUT for write operations, (selected via WCLK, WRADD bus and WADEN). On the WCLK cycle after a queue

selection, this flag will show the status of the newly selected queue. Data can be written to this queue on

the next cycle provided FF is HIGH. This flag has High-Impedance capability, this is important during

expansion of devices, when the FF flag output of up to 8 devices may be connected together on a common

line. The device with a queue selected takes control of the FF bus, all other devices place their FF output

into High-Impedance. When a queue selection is made on the write port this output will switch from

High-Impedance control on the next WCLK cycle. This flag is synchronized to WCLK.

FM(1) Flag Mode LVTTL This pin is setup before a master reset and must not toggle during any device operation. The state of the

INPUT FM pin during Master Reset will determine whether the PAFn and PAEn flag busses operate in either

Polled or Direct mode. If this pin is HIGH the mode is Polled, if LOW then it will be Direct.

FSTR PAFn Flag Bus LVTTL If direct operation of the PAFn bus has been selected, the FSTR input is used in conjunction with WCLK

Strobe INPUT and the WRADD bus to select a device for its queues to be placed on to the PAFn bus outputs. A device

addressed via the WRADD bus is selected on the rising edge of WCLK provided that FSTR is HIGH. If

Polled operations has been selected, FSTR should be tied inactive, LOW. Note, that a PAFn flag bus

PIN DESCRIPTIONS

Symbol Name I/O TYPE Description

IDT72V51336/72V51346/72V51356 3.3V, MULTI-QUEUE FLOW-CONTROL DEVICES

(8 QUEUES) 36 BIT WIDE CONFIGURATION 589,824, 1,179,648 and 2,359,296 bits

COMMERCIAL AND INDUSTRIAL

TEMPERATURE RANGES

PIN DESCRIPTIONS (CONTINUED)

FSTR PAFn Flag Bus LVTTL selection cannot be made, (FSTR must NOT go active) until programming of the part has been completed

(Continued) Strobe INPUT and SENO has gone LOW.

FSYNC PAFn Bus Sync LVTTL FSYNC is an output from the multi-queue device that provides a synchronizing pulse for the PAFn bus

OUTPUT during Polled operation of the PAFn bus. During Polled operation each quadrant of queue status flags is

loaded on to the PAFn bus outputs sequentially based on WCLK. The first WCLK rising edge loads device1

on to the PAFn bus outputs, the second WCLK rising edge loads device 2 and so on. During the WCLK

cycle that a selected device is placed on to the PAFn bus, the FSYNC output will be HIGH.

FXI PAFn Bus LVTTL The FXI input is used when multi-queue devices are connected in expansion mode and Polled PAFn

Expansion In INPUT bus operation has been selected . FXI of device ‘N’ connects directly to FXO of device ‘N-1’. The FXI

receives a token from the previous device in a chain. In single device mode the FXI input must be tied

LOW if the PAFn bus is operated in direct mode. If the PAFn bus is operated in polled mode the FXI input

must be connected to the FXO output of the same device. In expansion mode the FXI of the first device

should be tied LOW, when direct mode is selected.

FXO PAFn Bus LVTTL FXO is an output that is used when multi-queue devices are connected in expansion mode and Polled

Expansion Out OUTPUT PAFn bus operation has been selected . FXO of device ‘N’ connects directly to FXI of device ‘N+1’. This

pin pulses HIGH when device N places its PAF status on to the PAFn bus with respect to WCLK. This pulse

(token) is then passed on to the next device in the chain ‘N+1’ and on the next WCLK rising edge the first

quadrant of device N+1 will be loaded on to the PAFn bus. This continues through the chain and FXO

of the last device is then looped back to FXI of the first device. The FSYNC output of each device in the

chain provides synchronization to the user of this looping event.

ID[2:0](1) Device ID Pins LVTTL For the 8Q multi-queue device the WRADD address bus is 6 bits and RDADD address bus is 7 bits wide.

INPUT When a queue selection takes place the 3 MSb’s of this address bus are used to address the specific device

(the LSb’s are used to address the queue within that device). During write/read operations the 3 MSb’s

of the address are compared to the device ID pins. The first device in a chain of multi-queue’s (connected

in expansion mode), may be setup as ‘000’, the second as ‘001’ and so on through to device 8 which is

‘111’, however the ID does not have to match the device order. In single device mode these pins should

be setup as ‘000’ and the 3 MSb’s of the WRADD and RDADD address busses should be tied LOW. The

ID[2:0] inputs setup a respective devices ID during master reset. These ID pins must not toggle during

any device operation. Note, the device selected as the ‘Master’ does not have to have the ID of ‘000’.

IW(1) Input Width LVTTL This pin is used in conjunction with OW and BM to setup the input and output bus widths to be a combination

INPUT of x9, x18 or x36, (providing that one port is x36).

MAST(1) Master Device LVTTL The state of this input at Master Reset determines whether a given device (within a chain of devices), is the

INPUT Master device or a Slave. If this pin is HIGH, the device is the master, if it is LOW then it is a Slave. The master

device is the first to take control of all outputs after a master reset, all slave devices go to High-Impedance,

preventing bus contention. If a multi-queue device is being used in single device mode, this pin must

be set HIGH.

MRS Master Reset LVTTL A master reset is performed by taking MRS from HIGH to LOW, to HIGH. Device programming is required

INPUT after master reset.

OE Output Enable LVTTL The Output enable signal is an Asynchronous signal used to provide three-state control of the multi-queue

INPUT data output bus, Qout. If a device has been configured as a “Master” device, the Qout data outputs will

be in a Low Impedance condition if the OE input is LOW. If OE is HIGH then the Qout data outputs will be

in High Impedance. If a device is configured a “Slave” device, then the Qout data outputs will always be

in High Impedance until that device has been selected on the Read Port, at which point OE provides three-

state of that respective device.

OV Output Valid Flag LVTTL This output flag provides output valid status for the data word present on the multi-queue flow-control

OUTPUT device data output port, Qout. This flag is therefore, 2-stage delayed to match the data output path delay.

That is, there is a 2 RCLK cycle delay from the time a given queue is selected for reads, to the time the

OV flag represents the data in that respective queue. When a selected queue on the read port is read to

empty, the OV flag will go HIGH, indicating that data on the output bus is not valid. The OV flag also has

High-Impedance capability, required when multiple devices are used and the OV flags are tied together.

Symbol Name I/O TYPE Description

COMMERCIAL AND INDUSTRIAL

TEMPERATURE RANGES

IDT72V51336/72V51346/72V51356 3.3V, MULTI-QUEUE FLOW-CONTROL DEVICES

(8 QUEUES) 36 BIT WIDE CONFIGURATION 589,824, 1,179,648 and 2,359,296 bits

OW(1) Output Width LVTTL This pin is setup during Master Reset and must not toggle during any device operation. This pin is used

INPUT in conjunction with IW and BM to setup the data input and output bus widths to be a combination of x9,

x18 or x36, (providing that one port is x36).

PAE Programmable LVTTL This pin provides the Almost-Empty flag status for the queue that has been selected on the output port

Almost-Empty Flag OUTPUT for read operations, (selected via RCLK, RDADD and RADEN). This pin is LOW when the selected

queue almost-empty. This flag output may be duplicated on one of the PAEn bus lines. This flag

is synchronized to RCLK.

PAEn/PRn Programmable LVTTL On the 8Q device the PAEn/ PRn bus is 8 bits wide. During a Master Reset this bus is setup for either

Almost-Empty Flag OUTPUT Almost Empty mode or Packet mode. This output bus provides PAE/ PRn status of all 8 queues, within

Bus/Packet Ready a selected device. During queue read/write operations these outputs provide programmable empty

Flag Bus flag status or packet ready status, in either director polled mode. The mode of flag operation is determined

during master reset via the state of the FM input. This flag bus is capable of High-Impedance state, this

is important during expansion of multi-queue devices. During direct operation the PAEn/ PRn bus is

to show the PAE/PR status of queues within a selected device. Selection is made using RCLK, ESTR and

RDADD. During Polled operation the PAEn/ PRn bus is loaded with the PAE/ PRn status of multi-queue

flow-control devices sequentially based on the rising edge of RCLK. PAE or PR operation is determined

by the state of PKT during master reset.

PAF Programmable LVTTL This pin provides the Almost-Full flag status for the queue that has been selected on the input port for

Almost-Full Flag OUTPUT for write operations, (selected via WCLK, WRADD and WADEN). This pin is LOW when the selected

queue is almost-full. This flag output may be duplicated on one of the PAFn bus lines. This flag is

synchronized to WCLK.

PAFn Programmable LVTTL On the 8Q device the PAFn bus is 8 bits wide. This output bus provides PAF status of all 8 queues, within

Almost-Full Flag Bus OUTPUT a selected device. During queue read/write operations these outputs provide programmable full flag

status, in either direct or polled mode. The mode of flag operation is determined during master reset via

the state of the FM input. This flag bus is capable of High-Impedance state, this is important during

expansion of multi-queue devices. During direct operation the PAFn bus is updated to show the PAF

status of a queues within a selected device. Selection is made using WCLK, FSTR, WRADD and WADEN.

During Polled operation the PAFn bus is loaded with the PAF status of multi-queue flow-control devices

sequentially based on the rising edge of WCLK.

PKT(1) Packet Mode LVTTL The state of this pin during a Master Reset will determine whether the part is operating in Packet mode

INPUT providing both a Packet Ready (PR) output and a Programmable Almost Empty (PAE) discrete output,

or standard mode, providing a (PAE) output only. If this pin is HIGH during Master Reset the part will

operate in packet mode, if it is LOW then almost empty mode. If packet mode has been selected the read

port flag bus becomes packet ready flag bus, PRn and the discrete packet ready flag, PR is functional.

If almost empty operation has been selected then the flag bus provides almost empty status, PAEn and

the discrete almost empty flag, PAE is functional, the PR flag is inactive and should not be connected. Packet

Ready utilizes user marked locations to identify start and end of packets being written into the device.

Packet Mode can only be selected if both the input port width and output port width are 36 bits.

PR Packet Ready Flag LVTTL If packet mode has been selected this flag output provides Packet Ready status of the queue selected

OUTPUT for read operations. During a master reset the state of the PKT input determines whether Packet mode

of operation will be used. If Packet mode is selected, then the condition of the PR flag and OV signal are

asserted indicated a packet is ready for reading. The user must mark the start of a packet and the end

of a packet when writing data into a queue. Using these Start Of Packet (SOP) and End Of Packet (EOP)

markers, the multi-queue device sets PR LOW if one or more “complete” packets are available in the queue.

A complete packet(s) must be written before the user is allowed to switch queues.

PRS Partial Reset LVTTL A Partial Reset can be performed on a single queue selected within the multi-queue device. Before a Partial

INPUT Reset can be performed on a queue, that queue must be selected on both the write port and read port

2 clock cycles before the reset is performed. A Partial Reset is then performed by taking PRS LOW for

one WCLK cycle and one RCLK cycle. The Partial Reset will only reset the read and write pointers to

the first memory location, none of the devices configuration will be changed.

PIN DESCRIPTIONS (CONTINUED)

Symbol Name I/O TYPE Description

IDT72V51336/72V51346/72V51356 3.3V, MULTI-QUEUE FLOW-CONTROL DEVICES

(8 QUEUES) 36 BIT WIDE CONFIGURATION 589,824, 1,179,648 and 2,359,296 bits

COMMERCIAL AND INDUSTRIAL

TEMPERATURE RANGES

PIN DESCRIPTIONS (CONTINUED)

Symbol Name I/O TYPE Description

Q[35:0] Data Output Bus LVTTL These are the 36 data output pins. Data is read out of the device via these output pins on the rising

Qout OUTPUT edge of RCLK provided that REN is LOW, OE is LOW and the queue is selected. Note, that in Packet

mode Q32-Q35 may be used as packet markers, please see packet ready functional discussion for

more detail. Due to bus matching not all outputs may be used, any unused outputs should not be

connected.

RADEN Read Address LVTTL The RADEN input is used in conjunction with RCLK and the RDADD address bus to select a queue to

Enable INPUT be read from. A queue addressed via the RDADD bus is selected on the rising edge of RCLK provided

that RADEN is HIGH. RADEN should be asserted (HIGH) only during a queue change cycle(s). RADEN

should not be permanently tied HIGH. RADEN cannot be HIGH for the same RCLK cycle as ESTR.

Note, that a read queue selection cannot be made, (RADEN must NOT go active) until programming

of the part has been completed and SENO has gone LOW.

RCLK Read Clock LVTTL When enabled by REN, the rising edge of RCLK reads data from the selected queue via the output

INPUT bus Qout. The queue to be read is selected via the RDADD address bus and a rising edge of RCLK

while RADEN is HIGH. A rising edge of RCLK in conjunction with ESTR and RDADD will also select the

device to be placed on the PAEn/PRn bus during direct flag operation. During polled flag operation the

PAEn/PRn bus is cycled with respect to RCLK and the ESYNC signal is synchronized to RCLK. The PAE,

PR and OV outputs are all synchronized to RCLK. During device expansion the EXO and EXI signals

are based on RCLK. RCLK must be continuous and free-running.

RDADD Read Address Bus LVTTL For the 8Q device the RDADD bus is 7 bits. The RDADD bus is a dual purpose address bus. The first

[6:0] INPUT function of RDADD is to select a queue to be read from. The least significant 3 bits of the bus, RDADD[2:0]

are used to address 1 of 8 possible queues within a multi-queue device. Address pin, RDADD[3] provides

the user with a Null-Q address. If the user does not wish to address one of the 8 queues, a Null-Q can

be addressed using this pin. The Null-Q operation is discussed in more detail later. The most significant

3 bits, RDADD[6:4] are used to select 1 of 8 possible multi-queue devices that may be connected in

expansion mode. These 3 MSb’s will address a device with the matching ID code. The address present

on the RDADD bus will be selected on a rising edge of RCLK provided that RADEN is HIGH, (note, that

data can be placed on to the Qout bus, read from the previously selected queue on this RCLK edge). On

the next rising RCLK edge after a read queue select, a data word from the previous queue will be placed

onto the outputs, Qout, regardless of the REN input. Two RCLK rising edges after read queue select, data

will be placed on to the Qout outputs from the newly selected queue, regardless of REN due to the first

word fall through effect.

The second function of the RDADD bus is to select the device of queues to be loaded on to the PAEn/

PRn bus during strobed flag mode. The most significant 3 bits, RDADD[6:4] are again used to select 1

of 8 possible multi-queue devices that may be connected in expansion mode. Address bits RDADD[3:0]

are don’t care during device selection. The device address present on the RDADD bus will be selected

on the rising edge of RCLK provided that ESTR is HIGH, (note, that data can be placed on to the Qout

bus, read from the previously selected queue on this RCLK edge). Please refer to Table 2 for details

on RDADD bus.

REN Read Enable LVTTL The REN input enables read operations from a selected queue based on a rising edge of RCLK. A queue

INPUT to be read from can be selected via RCLK, RADEN and the RDADD address bus regardless of the

state of REN. Data from a newly selected queue will be available on the Qout output bus on the second

RCLK cycle after queue selection regardless of REN due to the FWFT operation. A read enable is not

required to cycle the PAEn/PRn bus (in polled mode) or to select the device , (in direct mode).

SCLK Serial Clock LVTTL If serial programming of the multi-queue device has been selected during master reset, the SCLK input

INPUT clocks the serial data through the multi-queue device. Data setup on the SI input is loaded into the device

on the rising edge of SCLK provided that SENI is enabled, LOW. When expansion of devices is performed

the SCLK of all devices should be connected to the same source.

SENI Serial Input Enable LVTTL During serial programming of a multi-queue device, data loaded onto the SI input will be clocked into the

INPUT part (via a rising edge of SCLK), provided the SENI input of that device is LOW. If multiple devices are

cascaded, the SENI input should be connected to the SENO output of the previous device. So when serial

loading of a given device is complete, its SENO output goes LOW, allowing the next device in the chain

to be programmed (SENO will follow SENI of a given device once that device is programmed). The SENI

input of the master device (or single device), should be controlled by the user.

COMMERCIAL AND INDUSTRIAL

TEMPERATURE RANGES

IDT72V51336/72V51346/72V51356 3.3V, MULTI-QUEUE FLOW-CONTROL DEVICES

(8 QUEUES) 36 BIT WIDE CONFIGURATION 589,824, 1,179,648 and 2,359,296 bits

PIN DESCRIPTIONS (CONTINUED)

Symbol Name I/O TYPE Description

SENO Serial Output Enable LVTTL This output is used to indicate that serial programming or default programming of the multi-queue device

OUTPUT has been completed. SENO follows SENI once programming of a device is complete. Therefore, SENO

will go LOW after programming provided SENI is LOW, once SENI is taken HIGH again, SENO will also

go HIGH. When the SENO output goes LOW, the device is ready to begin normal read/write operations.

If multiple devices are cascaded and serial programming of the devices will be used, the SENO output

should be connected to the SENI input of the next device in the chain. When serial programming of the

first device is complete, SENO will go LOW, thereby taking the SENI input of the next device LOW and

so on throughout the chain. When a given device in the chain is fully programmed the SENO output

essentially follows the SENI input. The user should monitor the SENO output of the final device in the chain.

When this output goes LOW, serial loading of all devices has been completed.

SI Serial In LVTTL During serial programming this pin is loaded with the serial data that will configure the multi-queue devices

INPUT Data present on SI will be loaded on a rising edge of SCLK provided that SENI is LOW. In expansion

mode the serial data input is loaded into the first device in a chain. When that device is loaded and its

SENO has gone LOW, the data present on SI will be directly output to the SO output. The SO pin of

the first device connects to the SI pin of the second and so on. The multi-queue device setup registers are

shift registers.

SO Serial Out LVTTL This output is used in expansion mode and allows serial data to be passed through devices in the chain

OUTPUT to complete programming of all devices. The SI of a device connects to SO of the previous device in the

chain. The SO of the final device in a chain should not be connected.

TCK(2) JTAG Clock LVTTL Clock input for JTAG function. One of four terminals required by IEEE Standard 1149.1-1990. Test

INPUT operations of the device are synchronous to TCK. Data from TMS and TDI are sampled on the rising edge

of TCK and outputs change on the falling edge of TCK. If the JTAG function is not used this signal needs

to be tied to GND.

TDI(2) JTAG Test Data LVTTL One of four terminals required by IEEE Standard 1149.1-1990. During the JTAG boundary scan

Input INPUT operation,test data serially loaded via the TDI on the rising edge of TCK to either the Instruction Register,

ID Register and Bypass Register. An internal pull-up resistor forces TDI HIGH if left unconnected.

TDO(2) JTAG Test Data LVTTL One of four terminals required by IEEE Standard 1149.1-1990. During the JTAG boundary scan

Output OUTPUT operation, test data serially loaded output via the TDO on the falling edge of TCK from either the Instruction

SHIFT-DR and SHIFT-IR controller states.

TMS(2) JTAG Mode Select LVTTL TMS is a serial input pin. One of four terminals required by IEEE Standard 1149.1-1990. TMS directs the

INPUT device through its TAP controller states. An internal pull-up resistor forces TMS HIGH if left unconnected.

TRST(2) JTAG Reset LVTTL TRST is an asynchronous reset pin for the JTAG controller. The JTAG TAP controller does not automatically

INPUT reset upon power-up, thus it must be reset by either this signal or by setting TMS= HIGH for five TCK cycles.

If the TAP controller is not properly reset then the outputs will always be in high-impedance. If the JTAG

function is used but the user does not want to use TRST, then TRST can be tied with MRS to ensure

proper queue operation. If the JTAG function is not used then this signal needs to be tied to GND. An

internal pull-up resistor forces TRST HIGH if left unconnected.

WADEN Write Address Enable LVTTL The WADEN input is used in conjunction with WCLK and the WRADD address bus to select a queue to

INPUT be written in to. A queue addressed via the WRADD bus is selected on the rising edge of WCLK provided

that WADEN is HIGH. WADEN should be asserted (HIGH) only during a queue change cycle(s). WADEN

should not be permanently tied HIGH. WADEN cannot be HIGH for the same WCLK cycle as FSTR. Note,

that a write queue selection cannot be made, (WADEN must NOT go active) until programming of the

part has been completed and SENO has gone LOW.

WCLK Write Clock LVTTL When enabled by WEN, the rising edge of WCLK writes data into the selected queue via the input bus,

INPUT Din. The queue to be written to is selected via the WRADD address bus and a rising edge of WCLK

while WADEN is HIGH. A rising edge of WCLK in conjunction with FSTR and WRADD will also select

the device to be placed on the PAFn bus during direct flag operation. During polled flag operation the

PAFn bus is cycled with respect to WCLK and the FSYNC signal is synchronized to WCLK. The PAFn,

PAF and FF outputs are all synchronized to WCLK. During device expansion the FXO and FXI signals

are based on WCLK. The WCLK must be continuous and free-running.

IDT72V51336/72V51346/72V51356 3.3V, MULTI-QUEUE FLOW-CONTROL DEVICES

(8 QUEUES) 36 BIT WIDE CONFIGURATION 589,824, 1,179,648 and 2,359,296 bits

COMMERCIAL AND INDUSTRIAL

TEMPERATURE RANGES

PIN DESCRIPTIONS (CONTINUED)

Symbol Name I/O TYPE Description

NOTES:

1. Inputs should not change after Master Reset.

2. These pins are for the JTAG port. Please refer to pages 52-56 and Figures 31-33.

WEN Write Enable LVTTL The WEN input enables write operations to a selected queue based on a rising edge of WCLK. A queue

INPUT to be written to can be selected via WCLK, WADEN and the WRADD address bus regardless of the

state of WEN. Data present on Din can be written to a newly selected queue on the second WCLK cycle

after queue selection provided that WEN is LOW. A write enable is not required to cycle the PAFn bus

(in polled mode) or to select the device , (in direct mode).

WRADD Write Address Bus LVTTL For the 8Q device the WRADD bus is 6 bits. The WRADD bus is a dual purpose address bus. The first

[5:0] INPUT function of WRADD is to select a queue to be written to. The least significant 3 bits of the bus, WRADD[2:0]

are used to address 1 of 8 possible queues within a multi-queue device. The most significant 3 bits,

WRADD[5:3] are used to select 1 of 8 possible multi-queue devices that may be connected in expansion

mode. These 3 MSb’s will address a device with the matching ID code. The address present on the WRADD

bus will be selected on a rising edge of WCLK provided that WADEN is HIGH, (note, that data present on

the Din bus can be written into the previously selected queue on this WCLK edge and on the next rising

WCLK also, providing that WEN is LOW). Two WCLK rising edges after write queue elect, data can be

written into the newly selected queue.

The second function of the WRADD bus is to select the device of queues to be loaded on to the PAFn bus

during strobed flag mode. The most significant 3 bits, WRADD[5:3] are again used to select 1 of 8 possible

multi-queue devices that may be connected in expansion mode. Address bits WRADD[2:0] are don’t care

during device selection. The device address present on the WRADD bus will be selected on the rising

edge of WCLK provided that FSTR is HIGH, (note, that data can be written into the previously selected

queue on this WCLK edge). Please refer to Table 1 for details on the WRADD bus.

VCC +3.3V Supply Power These are VCC power supply pins and must all be connected to a +3.3V supply rail.

GND Ground Pin Ground These are Ground pins and must all be connected to the GND supply rail.

COMMERCIAL AND INDUSTRIAL

TEMPERATURE RANGES

IDT72V51336/72V51346/72V51356 3.3V, MULTI-QUEUE FLOW-CONTROL DEVICES

(8 QUEUES) 36 BIT WIDE CONFIGURATION 589,824, 1,179,648 and 2,359,296 bits

Symbol Rating Com'l & Ind'l Unit

VTERM Terminal Voltage –0.5 to +4.5 V

with respect to GND

TSTG Storage Temperature –55 to +125 °C

IOUT DC Output Current –50 to +50 mA

DC ELECTRICAL CHARACTERISTICS

(Commercial: VCC = 3.3V ± 0.15V, TA = 0°C to +70°C;Industrial: VCC = 3.3V ± 0.15V, TA = 40°C to +85°C; JEDEC JESD8-A compliant)

Symbol Parameter Min. Max. Unit

ILI(1) Input Leakage Current –10 10 µA

ILO(2) Output Leakage Current –10 10 µA

VOH Output Logic “1” Voltage, IOH = –8 mA 2. 4 — V

VOL Output Logic “0” Voltage, IOL = 8 mA — 0. 4 V

ICC1(3,4,5) Active Power Supply Current — 100 mA

ICC2(3,6) Standby Current — 25 mA

ABSOLUTE MAXIMUM RATINGS

RECOMMENDED DC OPERATING

CONDITIONS

NOTES:

1. Measurements with 0.4 ≤ VIN ≤ VCC.

2. OE ≥ VIH, 0.4 ≤ VOUT ≤ VCC.

3. Tested with outputs open (IOUT = 0).

4. RCLK and WCLK toggle at 20 MHz and data inputs switch at 10 MHz.

5. Typical ICC1 = 16 + 3.14*fS + 0.02*CL*fS (in mA) with VCC = 3.3V, tA = 25°C, fS = WCLK frequency = RCLK frequency (in MHz, using TTL levels), data switching at fS/2,

CL = capacitive load (in pF).

6. RCLK and WCLK, toggle at 20 MHz.

The following inputs should be pulled to GND: WRADD, RDADD, WADEN, RADEN, FSTR, ESTR, SCLK, SI, EXI, FXI and all Data Inputs.

The following inputs should be pulled to VCC: WEN, REN, SENI, PRS, MRS, TDI, TMS and TRST.

All other inputs are don't care, and should be pulled HIGH or LOW.

NOTE:

1 . Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS may cause

permanent damage to the device. This is a stress rating only and functional operation

of the device at these or any other conditions above those indicated in the operational

sections of this specification is not implied. Exposure to absolute maximum rating

conditions for extended periods may affect reliability. NOTE:

1. VCC = 3.3V ± 0.15V, JEDEC JESD8-A compliant.

NOTES:

1. With output deselected, (OE ≥ VIH).

2. Characterized values, not currently tested.

CAPACITANCE (TA = +25°C, f = 1.0MHz)

Symbol Parameter(1) Conditions Max. Unit

CIN(2) Input VIN = 0V 10 pF

Capacitance

COUT(1,2) Output VOUT = 0V 10 pF

Capacitance

Symbol Parameter Min. Typ. Max. Unit

VCC(1) Supply Voltage (Com'l/Ind'l) 3.15 3.3 3.45 V

GND Supply Voltage (Com'l/Ind'l) 0 0 0 V

VIH Input High Voltage (Com'l/Ind'l) 2.0 — VCC+0.3 V

VIL Input Low Voltage (Com'l/Ind'l) — — 0.8 V

TAOperating Temperature Commercial 0 — +70 °C

TAOperating Temperature Industrial -40 — +85 °C

IDT72V51336/72V51346/72V51356 3.3V, MULTI-QUEUE FLOW-CONTROL DEVICES

(8 QUEUES) 36 BIT WIDE CONFIGURATION 589,824, 1,179,648 and 2,359,296 bits

COMMERCIAL AND INDUSTRIAL

TEMPERATURE RANGES

Input Pulse Levels GND to 3.0V

Input Rise/Fall Times 1.5ns

Input Timing Reference Levels 1.5V

Output Reference Levels 1.5V

Output Load See Figure 2a & 2b

AC TEST CONDITIONS

Figure 2a. AC Test Load Figure 2b. Lumped Capacitive Load, Typical Derating

5936 drw04

Ω

VCC/2

I/O Z

= 50

Ω

5936 drw04a

20 30 50 80 100 200

acitance

)

(Typical, ns)

AC TEST LOADS

OUTPUT ENABLE & DISABLE TIMING

VIH

VIL

OE &

OLZ

100mV

OHZ

100mV

Output

Normally

LOW

Output

Normally

HIGH

VOL

VOH

5936 drw04b

Output

Enable

Output

Disable

COMMERCIAL AND INDUSTRIAL

TEMPERATURE RANGES

IDT72V51336/72V51346/72V51356 3.3V, MULTI-QUEUE FLOW-CONTROL DEVICES

(8 QUEUES) 36 BIT WIDE CONFIGURATION 589,824, 1,179,648 and 2,359,296 bits

AC ELECTRICAL CHARACTERISTICS

(Commercial: VCC = 3.3V ± 0.15V, TA = 0°C to +70°C;Industrial: VCC = 3.3V ± 0.15V, TA = 40°C to +85°C; JEDEC JESD8-A compliant)

Commercial Com'l & Ind'l(1)

IDT72V51336L6 IDT72V51336L7-5

IDT72V51346L6 IDT72V51346L7-5

IDT72V51356L6 IDT72V51356L7-5

Symbol Parameter Min. Max. Min. Max. Unit

fSClock Cycle Frequency (WCLK & RCLK) — 166 — 133 MH z

tAData Access Time 0.6 3.7 0.6 4 ns

tCLK Clock Cycle Time 6 — 7.5 — ns

tCLKH Clock High Time 2. 7 — 3 .5 — ns

tCLKL Clock Low Time 2. 7 — 3. 5 — ns

tDS Data Setup Time 2 — 2.0 — ns

tDH Data Hold Time 0.5 — 0.5 — ns

tENS Enable Setup Time 2 — 2.0 — ns

tENH Enable Hold Time 0.5 — 0.5 — ns

tRS Reset Pulse Width 10 — 1 0 — ns

tRSS Reset Setup Time 15 — 15 — ns

tRSR Reset Recovery Time 10 — 10 — ns

tPRSS Partial Reset Setup 2.0 — 2.5 — ns

tPRSH Partial Reset Hold 0.5 — 0.5 — ns

tOLZ (OE-Qn)(2) Output Enable to Output in Low-Impedance 0.6 3.7 0.6 4 ns

tOHZ(2) Output Enable to Output in High-Impedance 0.6 3.7 0.6 4 ns

tOE Output Enable to Data Output Valid 0.6 3.7 0.6 4 ns

fCClock Cycle Frequency (SCLK) — 10 — 10 M Hz

tSCLK Serial Clock Cycle 100 — 100 — ns

tSCKH Serial Clock High 45 — 45 — n s

tSCKL Serial Clock Low 45 — 45 — n s

tSDS Serial Data In Setup 20 — 20 — ns

tSDH Serial Data In Hold 1. 2 — 1.2 — ns

tSENS Serial Enable Setup 20 — 20 — ns

tSENH Serial Enable Hold 1.2 — 1.2 — ns

tSDO SCLK to Serial Data Out — 2 0 — 20 ns

tSENO SCLK to Serial Enable Out — 2 0 — 20 ns

tSDOP Serial Data Out Propagation Delay 1.5 3.7 1.5 4 ns

tSENOP Serial Enable Propagation Delay 1.5 3.7 1.5 4 ns

tPCWQ Programming Complete to Write Queue Selection 20 — 20 — ns

tPCRQ Programming Complete to Read Queue Selection 20 — 20 ns

tAS Address Setup 2.5 — 3.0 — ns

tAH Address Hold 1 — 1 — ns

tWFF Write Clock to Full Flag — 3.7 — 5 ns

tROV Read Clock to Output Valid — 3.7 — 5 ns

tSTS Strobe Setup 2 — 2 — ns

tSTH Strobe Hold 0.5 — 0.5 — ns

tQS Queue Setup 2 — 2.5 — ns

tQH Queue Hold 0.5 — 0.5 — ns

tWAF WCLK to PAF flag 0 . 6 3 . 7 0.6 4 ns

tRAE RCLK to PAE flag 0.6 3.7 0. 6 4 n s

tPAF Write Clock to Synchronous Almost-Full Flag Bus 0.6 3.7 0.6 4 ns

tPAE Read Clock to Synchronous Almost-Empty Flag Bus 0. 6 3. 7 0.6 4 ns

NOTES:

1. Industrial temperature range product for the 7-5ns is available as a standard device. All other speed grades are available by special order.

2. Values guaranteed by design, not currently tested.

IDT72V51336/72V51346/72V51356 3.3V, MULTI-QUEUE FLOW-CONTROL DEVICES

(8 QUEUES) 36 BIT WIDE CONFIGURATION 589,824, 1,179,648 and 2,359,296 bits

COMMERCIAL AND INDUSTRIAL

TEMPERATURE RANGES

AC ELECTRICAL CHARACTERISTICS (CONTINUED)

(Commercial: VCC = 3.3V ± 0.15V, TA = 0°C to +70°C;Industrial: VCC = 3.3V ± 0.15V, TA = 40°C to +85°C; JEDEC JESD8-A compliant)

Commercial Com'l & Ind'l(1)

IDT72V51336L6 IDT72V51336L7-5

IDT72V51346L6 IDT72V51346L7-5

IDT72V51356L6 IDT72V51356L7-5

Symbol Parameter Min. Max. Min. Max. Unit

NOTES:

1. Industrial temperature range product for the 7-5ns is available as a standard device. All other speed grades are available by special order.

2. Values guaranteed by design, not currently tested.

tPAELZ(2) RCLK to PAE Flag Bus to Low-Impedance 0. 6 3. 7 0.6 4 n s

tPAEHZ(2) RCLK to PAE Flag Bus to High-Impedance 0. 6 3. 7 0 .6 4 ns

tPAFLZ(2) WCLK to PAF Flag Bus to Low-Impedance 0.6 3 .7 0. 6 4 n s

tPAFHZ(2) WCLK to PAF Flag Bus to High-Impedance 0. 6 3. 7 0. 6 4 n s

tFFHZ(2) WCLK to Full Flag to High-Impedance 0.6 3.7 0.6 4 ns

tFFLZ(2) WCLK to Full Flag to Low-Impedance 0.6 3.7 0.6 4 ns

tOVLZ(2) RCLK to Output Valid Flag to Low-Impedance 0.6 3.7 0.6 4 ns

tOVHZ(2) RCLK to Output Valid Flag to High-Impedance 0.6 3.7 0.6 4 ns

tFSYNC WCLK to PAF Bus Sync to Output 0.6 3. 7 0.6 4 ns

tFXO WCLK to PAF Bus Expansion to Output 0. 6 3. 7 0.6 4 n s

tESYNC RCLK to PAE Bus Sync to Output 0.6 3.7 0.6 4 ns

tEXO RCLK to PAE Bus Expansion to Output 0. 6 3 . 7 0. 6 4 n s

tPR RCLK to Packet Ready Flag 0. 6 3. 7 0 .6 4 ns

tSKEW1 SKEW time between RCLK and WCLK for FF and OV 4.5 — 5.75 — ns

tSKEW2 SKEW time between RCLK and WCLK for PAF and PAE 6 — 7.5 — ns

tSKEW3 SKEW time between RCLK and WCLK for PAF[0:7] and PAE[0:7] 6 — 7.5 — ns

tSKEW4 SKEW time between RCLK and WCLK for PR and OV 6 — 7.5 — ns

tSKEW5 SKEW time between RCLK and WCLK for OV when in Packet Mode 1 0 — 1 2 — ns

tXIS Expansion Input Setup 1.0 — 1.3 — ns

tXIH Expansion Input Hold 0.5 — 0.5 — ns

COMMERCIAL AND INDUSTRIAL

TEMPERATURE RANGES

IDT72V51336/72V51346/72V51356 3.3V, MULTI-QUEUE FLOW-CONTROL DEVICES

(8 QUEUES) 36 BIT WIDE CONFIGURATION 589,824, 1,179,648 and 2,359,296 bits

FUNCTIONAL DESCRIPTION

MASTER RESET

A Master Reset is performed by toggling the MRS input from HIGH to LOW

to HIGH. During a master reset all internal multi-queue device setup and control

registers are initialized and require programming either serially by the user via

the serial port, or using the default settings. During a master reset the state of

the following inputs determine the functionality of the part, these pins should be

held HIGH or LOW.

PKT – Packet Mode

FM – Flag bus Mode

IW, OW, BM – Bus Matching options

MAST – Master Device

ID0, 1, 2 – Device ID

DFM – Programming mode, serial or default

DF – Offset value for PAE and PAF

Once a master reset has taken place, the device must be programmed either

serially or via the default method before any read/write operations can begin.

See Figure 4, Master Reset for relevant timing.

PARTIAL RESET

A Partial Reset is a means by which the user can reset both the read and write

pointers of a single queue that has been setup within a multi-queue device.

Before a partial reset can take place on a queue, the respective queue must be

selected on both the read port and write port a minimum of 2 RCLK and 2 WCLK

cycles before the PRS goes LOW. The partial reset is then performed by toggling

the PRS input from HIGH to LOW to HIGH, maintaining the LOW state for at least

one WCLK and one RCLK cycle. Once a partial reset has taken place a minimum

of 3 WCLK and 3 RCLK cycles must occur before enabled writes or reads can

occur.

A Partial Reset only resets the read and write pointers of a given queue, a

partial reset will not effect the overall configuration and setup of the multi-queue

device and its queues.

See Figure 5, Partial Reset for relevant timing.

SERIAL PROGRAMMING

The multi-queue flow-control device is a fully programmable device, provid-

ing the user with flexibility in how queues are configured in terms of the number

of queues, depth of each queue and position of the PAF/PAE flags within

respective queues. All user programming is done via the serial port after a master

reset has taken place. Internally the multi-queue device has setup registers

which must be serially loaded, these registers contain values for every queue

within the device, such as the depth and PAE/PAF offset values. The

IDT72V51336/72V51346/72V51356 devices are capable of up to 8 queues

and therefore contain 8 sets of registers for the setup of each queue.

During a Master Reset if the DFM (Default Mode) input is LOW, then the device

will require serial programming by the user. It is recommended that the user

utilize a ‘C’ program provided by IDT, this program will prompt the user for all

information regarding the multi-queue setup. The program will then generate

a serial bit stream which should be serially loaded into the device via the serial

port. For the IDT72V51336/72V51346/72V51356 devices the serial program-

ming requires a total number of serially loaded bits per device, (SCLK cycles

with SENI enabled), calculated by: 19+(Qx72) where Q is the number of queues

the user wishes to setup within the device. Please refer to the separate

Application Note, AN-303 for recommended control of the serial programming

port.

Once the master reset is complete and MRS is HIGH, the device can be

serially loaded. Data present on the SI (serial in), input is loaded into the serial

port on a rising edge of SCLK (serial clock), provided that SENI (serial in

enable), is LOW. Once serial programming of the device has been successfully

completed the device will indicate this via the SENO (serial output enable) going

active, LOW. Upon detection of completion of programming, the user should

cease all programming and take SENI inactive, HIGH. Note, SENO follows SENI

once programming of a device is complete. Therefore, SENO will go LOW after

programming provided SENI is LOW, once SENI is taken HIGH again, SENO

will also go HIGH. The operation of the SO output is similar, when programming

of a given device is complete, the SO output will follow the SI input.

If devices are being used in expansion mode the serial ports of devices should

be cascaded. The user can load all devices via the serial input port control pins,

SI & SENI, of the first device in the chain. Again, the user may utilize the ‘C’

program to generate the serial bit stream, the program prompting the user for

the number of devices to be programmed. The SENO and SO (serial out) of

the first device should be connected to the SENI and SI inputs of the second

device respectively and so on, with the SENO & SO outputs connecting to the

SENI & SI inputs of all devices through the chain. All devices in the chain should

be connected to a common SCLK. The serial output port of the final device should

be monitored by the user. When SENO of the final device goes LOW, this

indicates that serial programming of all devices has been successfully com-

pleted. Upon detection of completion of programming, the user should cease all

programming and take SENI of the first device in the chain inactive, HIGH.

As mentioned, the first device in the chain has its serial input port controlled

by the user, this is the first device to have its internal registers serially loaded

by the serial bit stream. When programming of this device is complete it will take

its SENO output LOW and bypass the serial data loaded on the SI input to its

SO output. The serial input of the second device in the chain is now loaded with

the data from the SO of the first device, while the second device has its SENI

input LOW. This process continues through the chain until all devices are

programmed and the SENO of the final device goes LOW.

Once all serial programming has been successfully completed, normal

operations, (queue selections on the read and write ports) may begin. When

connected in expansion mode, the IDT72V51336/72V51346/72V51356 de-

vices require a total number of serially loaded bits per device to complete serial

programming, (SCLK cycles with SENI enabled), calculated by: n[19+(Qx72)]

where Q is the number of queues the user wishes to setup within the device,

where n is the number of devices in the chain.

See Figure 6, Serial Port Connection and Figure 7, Serial Programming for

connection and timing information.

DEFAULT PROGRAMMING

During a Master Reset if the DFM (Default Mode) input is HIGH the multi-

queue device will be configured for default programming, (serial programming

is not permitted). Default programming provides the user with a simpler,

however limited means by which to setup the multi-queue flow-control device,

rather than using the serial programming method. The default mode will

configure a multi-queue device such that the maximum number of queues

possible are setup, with all of the parts available memory blocks being allocated

equally between the queues. The values of the PAE/PAF offsets is determined

by the state of the DF (default) pin during a master reset.

For the IDT72V51336/72V51346/72V51356 devices the default mode will

setup 8 queues, each queue being 2,048 x 36, 4,096 x 36 and 8,192 x 36 deep

respectively. For both devices the value of the PAE/PAF offsets is determined

at master reset by the state of the DF input. If DF is LOW then both the PAE &

PAF offset will be 8, if HIGH then the value is 128.

When configuring the IDT72V51336/72V51346/72V51356 devices in de-

fault mode the user simply has to apply WCLK cycles after a master reset, until

SENO goes LOW, this signals that default programming is complete. These clock

IDT72V51336/72V51346/72V51356 3.3V, MULTI-QUEUE FLOW-CONTROL DEVICES

(8 QUEUES) 36 BIT WIDE CONFIGURATION 589,824, 1,179,648 and 2,359,296 bits

COMMERCIAL AND INDUSTRIAL

TEMPERATURE RANGES

cycles are required for the device to load its internal setup registers. When a

single multi-queue device is used, the completion of device programming is

signaled by the SENO output of a device going from HIGH to LOW. Note, that

SENI must be held LOW when a device is setup for default programming mode.

When multi-queue devices are connected in expansion mode, the SENI of

the first device in a chain can be held LOW. The SENO of a device should connect

to the SENI of the next device in the chain. The SENO of the final device is used

to indicate that default programming of all devices is complete. When the final

SENO goes LOW normal operations may begin. Again, all devices will be

programmed with their maximum number of queues and the memory divided

equally between them. Please refer to Figure 8, Default Programming.

READING AND WRITING TO THE IDT MULTI-QUEUE

FLOW CONTROL MANAGER

The IDT72V51336/72V51346/72V51356 multi-queue flow-control de-

vices can be configured in two distinct modes, namely Standard Mode and

Packet Mode.

STANDARD MODE OPERATION (PKT = LOW on Master Reset)

WRITE QUEUE SELECTION AND WRITE OPERATION

(STANDARD MODE)

The IDT72V51336/72V51346/72V51356 multi-queue flow-control de-

vices can be configured up to a maximum of 8 queues into which data can be

written via a common write port using the data inputs (Din), write clock (WCLK)

and write enable (WEN). The queue to be written is selected by the address

present on the write address bus (WRADD) during a rising edge on WCLK

while write address enable (WADEN) is HIGH. The state of WEN does not

impact the queue selection. The queue selection is requires 2 WCLK cycles.

All subsequent data writes will be to this queue until another queue is selected.

Standard mode operation is defined as individual words will be written to the

device as opposed to Packet Mode where complete packets may be written.

The write port is designed such that 100% bus utilization can be obtained. This

means that data can be written into the device on every WCLK rising edge

including the cycle that a new queue is being addressed.

Changing queues requires a minimum of 2 WCLK cycles on the write port

(see Figure 9, Write Queue Select, Write Operation and Full flag Operation).

WADEN goes high signaling a change of queue (clock cycle “A”). The address

on WRADD at that time determines the next queue. Data presented during that

cycle (“A”) and the next cycle (“B”), will be written to the active (old) queue,

provided WEN is active LOW. If WEN is HIGH (inactive) for these two clock

cycles, data will not be written in to the previous queue. The write port discrete

full flag will update to show the full status of the newly selected queue (QX) at

this last cycle’s rising edge (“B”). Data present on the data input bus (Din), can

be written into the newly selected queue (QX) on the rising edge of WCLK on

the second cycle (“C”) following a change of queue, provided WEN is LOW

and the new queue is not full. If the newly selected queue is full at the point of

its selection, any writes to that queue will be prevented. Data cannot be written

into a full queue.

Refer to Figure 9, Write Queue Select, Write Operation and Full flag

Operation, Figure 10, Write Operations & First Word Fall Through for timing

diagrams and Figure 11, Full Flag Timing in Expansion Mode for timing

diagrams.

TABLE 1 — WRITE ADDRESS BUS, WRADD[5:0]

Operation WCLK WADEN FSTR WRADD[5:0]

Write Queue

Select

Device Select

(Compared to

ID0,1,2)

Write Queue Address

(3 bits = 8 Queues)

543 10

Device Select

(Compared to

ID0,1,2)

PAFn Flag Bus

Device Select

5936 drw05

COMMERCIAL AND INDUSTRIAL

TEMPERATURE RANGES

IDT72V51336/72V51346/72V51356 3.3V, MULTI-QUEUE FLOW-CONTROL DEVICES

(8 QUEUES) 36 BIT WIDE CONFIGURATION 589,824, 1,179,648 and 2,359,296 bits

READ QUEUE SELECTION AND READ OPERATION (STANDARD MODE)

The IDT72V51336/72V51346/72V51356 multi-queue flow-control de-

vices can be configured up to a maximum of 8 queues which data can be read

via a common read port using the data outputs (Qout), read clock (RCLK) and

read enable (REN). An output enable, OE control pin is also provided to allow

High-Impedance selection of the Qout data outputs. The multi-queue device

read port operates in a mode similar to “First Word Fall Through” on a

SuperSync IDT FIFO, but with the added feature of data output pipelining (see

Figure 10, Write Operations & First Word Fall Through). The queue to be

read is selected by the address presented on the read address bus (RDADD)

during a rising edge on RCLK while read address enable (RADEN) is HIGH.

The state of REN does not impact the queue selection. The queue selection

is requires 2 RCLK cycles. All subsequent data reads will be from this queue

until another queue is selected.

Standard mode operation is defined as individual words will be read from

the device as opposed to Packet Mode where complete packets may be read.

The read port is designed such that 100% bus utilization can be obtained. This

means that data can be read out of the device on every RCLK rising edge

including the cycle that a new queue is being addressed.

Changing queues requires a minimum of two RCLK cycles on the read port

(see Figure 12, Read Queue Select, Read Operation). RADEN goes high

signaling a change of queue (clock cycle “D”). The address on RDADD at that

time determines the next queue. Data presented during that cycle (“D”) will be

read at “D” (+ tA), can be read from the active (old) queue (QP), provided REN

is active LOW. If REN is HIGH (inactive) for this clock cycle, data will not be read

from the previous queue. The next cycle’s rising edge (“E”), the read port

discrete empty flag will update to show the empty status of the newly selected

queue (QF). The internal pipeline is also loaded at this time (“D”) with the last

word from the previous (old) queue (QP) as well as the next word from the new

queue (QF). Both of these words will fall through to the output register( provided

the OE is asserted) consecutively (cycles “E” and “F” respectively) following

the selection of the new queue regardless of the state of REN, unless the new

queue (QF) is empty. If the newly selected queue is empty, any reads from that

queue will be prevented. Data cannot be read from an empty queue. The last

word in the data output register (from the previous queue), will remain on the

data bus, but the output valid flag, OV will go HIGH, to indicate that the data

present is no longer valid. This pipelining effect provides the user with 100%

bus utilization, and brings about the possibility that a “NULL” queue may be

required within a multi-queue device. Null queue operation is discussed in the

next section. Remember that OE allows the user to place the data output bus

(Qout) into High-Impedance and the data can be read in to the output register

regardless of OE.

Refer to Table 2, for Read Address Bus arrangement. Also, refer to Figures

12, 14, and 15 for read queue selection and read port operation timing

diagrams.

PACKET MODE OPERATION (PKT = HIGH on Master Reset)

The Packet mode operation provides the capability where, user defined

packets or frames can be written to the device as opposed to Standard mode

where individual words are written. For clarification, in Packet Mode, a packet

can be written to the device with the starting location designated as Transmit

Start of Packet (TSOP) and the ending location designated as Transmit End

of Packet (TEOP). In conjunction, a packet read from the device will be

designated as Receive Start of Packet (RSOP) and a Receive End of Packet

Operation RCLK RADEN ESTR RDADD[6:0]

Read Queue

Select

Device Select

(Compared to

ID0,1,2)

Read Queue Address

(3 bits = 8 Queues)

654 3 10

654 3 21

Device Select

(Compared to

ID0,1,2)

Flag Bus Device

Selection

5936 drw06

Null-Q

Select Pin

TABLE 2 — READ ADDRESS BUS, RDADD[6:0]

IDT72V51336/72V51346/72V51356 3.3V, MULTI-QUEUE FLOW-CONTROL DEVICES

(8 QUEUES) 36 BIT WIDE CONFIGURATION 589,824, 1,179,648 and 2,359,296 bits

COMMERCIAL AND INDUSTRIAL

TEMPERATURE RANGES

(REOP). The minimum size for a packet is four words (SOP, two words of data

and EOP). The almost empty flag bus becomes the “Packet Ready” PR flag

bus when the device is configured for packet mode. Valid packets are indicated

when both PR and OV are asserted.

WRITE QUEUE SELECTION AND WRITE OPERATION (PACKET MODE)

It is required that a full packet be written to a queue before moving to a different

queue. The device requires two cycles to change queues. Packet mode, has

2 restrictions: <1> An extra word (or filler word) is required to be written after

each packet on the cycle following the queue change to ensure the RSOP in

the old queue is not read out on a queue change because of the first word fall

through. <2> No SOP/EOP is allowed to read/written at cycle (“C” or “I”) the

next cycle after a queue change. For clock frequency (fs) of 133MHz and below

see Application Note AN-398. In this mode, the write port may not obtain 100%

bus utilization.

Changing queues requires a minimum of two WCLK cycles on the write port

(see Figure 16, Writing in Packet Mode during a Queue Change). WADEN

goes high signaling a change of queue (clock cycle “B” or “H”). The address

on WRADD at the rising edge of WCLK determines the next queue. Data

presented on Din during that cycle (“B” or “H”) can continue to be written to

the active (old) queue (QA or QB respectively), provided WEN is LOW (active).

If WEN is HIGH (inactive) for this clock cycle (H), data will not be written in to

the previous queue (QB). The cycle following a request for queue change (“C”

or “I”) will require a filler word to be written to the device. This can be done

by clocking the TEOP twice or by writing a filler word. In packet mode, the multi-

queue is designed under the 2 restrictions listed previously. Note, an

erroneous Packet Ready flag may occur if the EOP or SOP marker shows up

at the next cycle after a queue change. To prevent an erroneous Packet Ready

flag from occurring a filler word should be written into the old queue at the last

clock cycle of writing. It is important to know that no SOP or EOP may be written

into the device during this cycle (“C” or “I”). The write port discrete full flag will

update to show the full status of the newly selected queue (QB) at this last cycle’s

rising edge (“C” or “I”). Data values presented on the data input bus (Din),

can be written into the newly selected queue (QX) on the rising edge of WCLK

on the second cycle (“D” or “J”) following a request for change of queue,

provided WEN is LOW (active) and the new queue is not full. If a selected queue

is full (FF is LOW), then writes to that queue will be prevented. Note, data cannot

be written into a full queue.

Refer to Figure 16, Writing in Packet Mode during a Queue Change and

Figure 18, Data Input (Transit) packet mode of Operation for timing diagrams.

READ QUEUE SELECTION AND READ OPERATION (PACKET MODE)

In Packet mode it is required that a full packet is read from a queue before

moving to a different queue. The device requires two cycles to change queues.

In Packet Mode, there are 2 restrictions <1> An extra word (or filler word)

should have been inserted into the data stream after each packet to insure the

RSOP in the old queue is not read out on a queue change because of the first

word fall through and this word should be discarded. <2> No EOP/SOP is

allowed to be read/written at cycle (“C” or “I”) the next cycle after a queue

change). For clock frequency of 133Mhz and below see Application Note AN-

398. In this mode, the read port may not obtain 100% bus utilization.

Changing queues requires a minimum of two RCLK cycles on the read port

(see Figure 17, Reading in Packet Mode during a Queue Change). RADEN

goes high signaling a change of queue (clock cycle “B” or “I”). The address

on RDADD at the rising edge of RCLK determines the queue. As illustrated

in Figure 17 during cycle (“B”), data can be read from the active (old) queue

(QA)), provided both REN and OE are LOW (active) simultaneously with

changing queues. REOP for packet located in queue (QA) must be read before

a queue change request is made (“B”). If REN is HIGH (inactive) for this clock

cycle (“I”), data will not be read from the previous queue (QB). In applications

where the multi-queue flow-control device is connected to a shared bus, an

output enable, OE control pin is also provided to allow High-Impedance

selection of the data outputs (Qout). With reference to Figure 17 when changing

queues, a packet marker (SOP or EOP) should not be read on cycle (“C” or

“I”). Reading a SOP or EOP should not occur during the cycles required for

a queue change. It is also recommended that a queue change should not occur

once the reading of the packet has commenced. The EOP marker of the packet

prior to a queue change should be read on or before the queue change. If the

EOP word is read before a queue change, REN can be pulled high to disable

further reads. When the queue change is initiated, the filler word written into

the current queue after the EOP word will fall through followed by and the first

word from the new queue.

Refer to Figure 17, Reading in Packet Mode during a Queue Change as

well as Figures 12, 14, and 15 for timing diagrams and Table 2, for Read

Address bus arrangement.

Note, the almost empty flag bus becomes the “Packet Ready” flag bus when

the device is configured for packet mode.

PACKET READY FLAG

The multi-queue flow-control device provides the user with a Packet Ready

feature. During a Master Reset the logic “1” (HIGH) on the PKT input signal

(packet mode select), configures the device in packet mode. The PR discrete

flag, provides a packet ready status of the active queue selected on the read

port. A packet ready status is individually maintained on all queues; however

only the queue selected on the read port has its packet ready status indicated

on the PR output flag. A packet is available on the output for reading when both

PR and OV are asserted LOW. If less than a full packet is available, the PR flag

will be HIGH (packet not ready). In packet mode, no words can be read from

a queue until a complete packet has been written into that queue, regardless

of REN.

When packet mode is selected the Programmable Almost Empty bus, PAEn,

becomes the Packet Ready bus, PRn. When configured in Direct Bus (FM =

LOW during a master reset), the PRn bus provides packet ready status in 8

queue increments. The PRn bus supports either Polled or Direct modes of

operation. The PRn mode of operation is configured through the Flag Mode

(FM) bit during a Master Reset.

When the multi-queue is configured for packet mode operation, the device

must also be configured for 36 bit write data bus and 36 bit read data bus. The

two most significant bits of the 36-bit data bus are used as “packet markers”.

On the write port these are bits D34 (Transmit Start of Packet,) D35 (Transmit

End of Packet) and on the read port Q34, Q35. All four bits are monitored by

the packet control logic as data is written into and read out from the queues.

The packet ready status for individual queues is then determined by the packet

ready logic.

On the write port D34 is used to “mark” the first word being written into the

selected queue as the “Transmit Start of Packet”, TSOP. To further clarify, when

the user requires a word being written to be marked as the start of a packet,

the TSOP input (D34) must be HIGH for the same WCLK rising edge as the

word that is written. The TSOP marker is stored in the queue along with the

data it was written in until the word is read out of the queue via the read port.

On the write port D35 is used to “mark” the last word of the packet currently

being written into the selected queue as the “Transmit End of Packet” TEOP.

When the user requires a word being written to be marked as the end of a

packet, the TEOP input must be HIGH for the same WCLK rising edge as the

word that is written in. The TEOP marker is stored in the queue along with the

data it was written in until the word is read out of the queue via the read port.

COMMERCIAL AND INDUSTRIAL

TEMPERATURE RANGES

IDT72V51336/72V51346/72V51356 3.3V, MULTI-QUEUE FLOW-CONTROL DEVICES

(8 QUEUES) 36 BIT WIDE CONFIGURATION 589,824, 1,179,648 and 2,359,296 bits

The packet ready logic monitors all start and end of packet markers both as

they enter respective queues via the write port and as they exit queues via

the read port. The multi-queue internal logic increments and decrements a

packet counter, which is provided for each queue. The functionality of the

packet ready logic provides status as to whether at least one full packet of data

is available within the selected queue. A partial packet in a queue is regarded

as a packet not ready and PR (active LOW) will be HIGH. In Packet mode, no

words can be read from a queue until at least one complete packet has been

written into the queue, regardless of REN. For example, if a TSOP has been

written and some number of words later a TEOP is written a full packet of data

is deemed to be available, and the PR flag and OV will go active LOW.

Consequently if reads begin from a queue that has only one complete packet

and the RSOP is detected on the output port as data is being read out, PR will

go inactive HIGH. OV will remain LOW indicating there is still valid data being

read out of that queue until the REOP is read. The user may proceed with the

reading operation until the current packet has been read out and no further

complete packets are available. If during that time another complete packet has

been written into the queue and the PR flag will again gone active, then reads

from the new packet may follow after the current packet has been completely

read out.

The packet counters therefore look for start of packet markers followed by

end of packet markers and regard data in between the TSOP and TEOP as

a full packet of data. The packet monitoring has no limitation as to how many

packets are written into a queue, the only constraint is the depth of the queue.

Note, there is a minimum allowable packet size of four words, inclusive of the

TSOP marker and TEOP marker.

The packet logic does expect a TSOP marker to be followed by a TEOP

marker.

If a second TSOP marker is written after a first, it is ignored and the logic

regards data between the first TSOP and the first subsequent TEOP as the full

packet. The same is true for TEOP; a second consecutive TEOP mark is

ignored. On the read side the user should regard a packet as being between

the first RSOP and the first subsequent REOP and disregard consecutive

RSOP markers and/or REOP markers. This is why a TEOP may be written

twice, using the second TEOP as the filler word.

As an example, the user may also wish to implement the use of an “Almost

End of Packet” (AEOP) marker. For example, the AEOP can be assigned to

data input bit D33. The purpose of this AEOP marker is to provide an indicator

that the end of packet is a fixed (known) number of reads away from the end

of packet. This is a useful feature when due to latencies within the system,

monitoring the REOP marker alone does not prevent “over reading” of the data

from the queue selected. For example, an AEOP marker set 4 writes before

the TEOP marker provides the device connected to the read port with and

“almost end of packet” indication 4 cycles before the end of packet.

The AEOP can be set any number of words before the end of packet determined

by user requirements or latencies involved in the system.

See Figure 17, Reading in Packet Mode during a Queue Change, Figure

18, Data Input (Transmit) Packet Mode of Operation and Figure 19, Data

Output (Receive) Packet Mode of Operation.

PACKET MODE – MODULO OPERATION

The internal packet ready control logic performs no operation on these

modulo bits, they are only informational bits that are passed through with the

respective data byte(s).

When utilizing the multi-queue flow-control device in packet mode, the user

may also want to consider the implementation of “Modulo” operation or “valid

byte marking”. Modulo operation may be useful when the packets being

transferred through a queue are in a specific byte arrangement even though

the data bus width is 36 bits. In Modulo operation the user can concatenate bytes

to form a specific data string through the multi-queue device. A possible scenario

is where a limited number of bytes are extracted from the packet for either

analysis or filtered for security protection. This will only occur when the first 36

bit word of a packet is written in and the last 36 bit word of packet is written in.

The modulo operation is a means by which the user can mark and identify

specific data within the Queue.

On the write port data input bits, D32 (transmit modulo bit 2, TMOD2) and

D33 (transmit modulo bit 1, TMOD1) can be used as data markers. An example

of this could be to use D32 and D33 to code which bytes of a word are part

of the packet that is also being marked as the “Start of Marker” or “End of

Marker”. Conversely on the read port when reading out these marked words,

data outputs Q32 (receive modulo bit 2, RMOD2) and Q33 (receive modulo

bit 1, RMOD1) will pass on the byte validity information for that word. Refer to

Table 5 for one example of how the modulo bits may be setup and used. See

Figure 18, Data Input (Transmit) Packet Mode of Operation and Figure 19,

Data Output (Receive) Packet Mode of Operation.

BYTE ABYTE BBYTE CBYTE D

D0/Q0

D35/Q35

TMOD1 (D33)

RMOD1 (Q33)

TMOD2 (D32)

RMOD2 (Q32) VALID BYTES

0 0 A, B, C, D

01A

1 0 A, B

1 1 A, B, C

D15/Q15

D23/Q23

D31/Q31

D34/Q34

D33/Q33

D32/Q32

MOD 2

MOD 1

SOP

EOP

D7/Q7

5936 drw07

TABLE 5 — PACKET MODE VALID BYTE

NOTE:

Packet Mode is only available when the Input Port and Output Port are 36 bits wide.

IDT72V51336/72V51346/72V51356 3.3V, MULTI-QUEUE FLOW-CONTROL DEVICES

(8 QUEUES) 36 BIT WIDE CONFIGURATION 589,824, 1,179,648 and 2,359,296 bits

COMMERCIAL AND INDUSTRIAL

TEMPERATURE RANGES

NULL QUEUE OPERATION (OF THE READ PORT)

Pipelining of data to the output port enables the device to provide 100% bus

utilization in standard mode. Data can be read out of the multi-queue flow-control

device on every RCLK cycle regardless of queue switches or other opera-

tions. The device architecture is such that the pipeline is constantly filled with

the next words in a selected queue to be read out, again providing 100% bus

utilization. This type of architecture does assume that the user is constantly

switching queues such that during a queue switch, the last data word required

from the previous queue will fall through the pipeline to the output.

Note, that if reads cease at the empty boundary of a queue, then the last word

will automatically flow through the pipeline to the output.

The Null-Q is selected via read port address space RDADD[3]. The

RDADD[6:0] bus should be addressed with xxx1xxx, this address is the Null-

Q. A null queue can be selected when no further reads are required from a

previously selected queue. Changing to a null queue will continue to propagate

data in the pipeline to the previous queue’s output. The Null Q can remain

selected until a data becomes available in another queue for reading. The Null-

Q can be utilized in either standard or packet mode.

Note: If the user switches the read port to the null queue, this queue is seen

as and treated as an empty queue, therefore after switching to the null queue

the last word from the previous queue will remain in the output register and the

OV flag will go HIGH, indicating data is not valid.

The Null queue operation only has significance to the read port of the multi-

queue, it is a means to force data through the pipeline to the output. Null Q

selection and operation has no meaning on the write port of the device. Also,

refer to Figure 20, Read Operation and Null Queue Select for diagram.

PAFn FLAG BUS OPERATION

The IDT72V51336/72V51346/72V51356 multi-queue flow-control devices

can be configured for up to 4 queues, each queue having its own almost full

status. An active queue has its flag status output to the discrete flags, FF and PAF,

on the write port. Queues that are not selected for a write operation can have

their PAF status monitored via the PAFn bus. The PAFn flag bus is 8 bits wide,

so that all 8 queues can have their status output to the bus. When a single

multi-queue device is used anywhere from 1 to 8 queues may be set-up within

the part, each queue having its own dedicated PAF flag output on the PAFn bus.

Queues 1 through 8 have their PAF status to PAF[0] through PAF[7]

respectively. If less than 8 queues are used then only the associated PAFn

outputs will be required, unused PAFn outputs will be don’t care outputs. When

devices are connected in expansion mode the PAFn flag bus can also be

expanded beyond 8 bits to produce a wider PAFn bus that encompasses all

queues.

Alternatively, the 8 bit PAFn flag bus of each device can be connected together

to form a single 8 bit bus, i.e. PAF[0] of device 1 will connect to PAF[0] of device

2 etc. When connecting devices in this manner the PAFn can only be driven

by a single device at any time, (the PAFn outputs of all other devices must be

in high impedance state). There are two methods by which the user can select

which device has control of the bus, these are “Direct” (Addressed) mode or

“Polled” (Looped) mode, determined by the state of the FM (flag Mode) input

during a Master Reset.

EXPANDING UP TO 64 QUEUES OR PROVIDING DEEPER QUEUES

Expansion can take place using either the standard mode or the packet

mode. In the 8 queue multi-queue device, the WRADD address bus is 6 bits

wide. The 3 Least Significant bits (LSbs) are used to address one of the 8

available queues within a single multi-queue device. The 3 Most Significant bits

(MSbs) are used when a device is connected in expansion mode with up to

8 devices connected in width expansion, each device having its own 3-bit

address. When logically expanded with multiple parts, each device is statically

setup with a unique chip ID code on the ID pins, ID0, ID1, and ID2. A device

is selected when the 3 Most Significant bits of the WRADD address bus matches

a 3-bit ID code. The maximum logical expansion is 64 queues (8 queues x

8 devices) or a minimum of 8 queues (1 queue per device x 8 devices), each

of the maximum size of the individual memory device.

Note: The WRADD bus is also used in conjunction with FSTR (almost full

flag bus strobe), to address the almost full flag bus during direct mode of

operation.

Refer to Table 1, for Write Address bus arrangement. Also, refer to Figure

11, Full Flag Timing Expansion Mode, Figure 13, Output Valid Flag Timing

(In Expansion Mode), and Figure 30, Multi-Queue Expansion Diagram, for

timing diagrams.

BUS MATCHING OPERATION

Bus Matching operation between the input port and output port is available.

During a master reset of the multi-queue the state of the three setup pins, BM

(Bus Matching), IW (Input Width) and OW (Output Width) determine the input and

output port bus widths as per the selections shown in Table 3, “Bus Matching

Set-up”. 9 bit bytes, 18 bit words and 36 bit long words can be written into and

read form the queues provided that at least one of the ports is setup for x36

operation. When writing to or reading from the multi-queue in a bus matching

mode, the device orders data in a “Little Endian” format. See Figure 3, Bus

Matching Byte Arrangement for details.

The Full flag and Almost Full flag operation is always based on writes and

reads of data widths determined by the write port width. For example, if the input

port is x36 and the output port is x9, then four data reads from a full queue will

be required to cause the full flag to go HIGH (queue not full). Conversely, the

Output Valid flag and Almost Empty flag operations are always based on writes

and reads of data widths determined by the read port. For example, if the input

port is x18 and the output port is x36, two write operations will be required to

cause the output valid flag of an empty queue to go LOW, output valid (queue

is not empty).

Note, that the input port serves all queues within a device, as does the output

port, therefore the input bus width to all queues is equal (determined by the input

port size) and the output bus width from all queues is equal (determined by the

output port size).

BM IW OW Write Port Read Port

0 X X x36 x36

1 0 0 x36 x18

1 0 1 x36 x9

1 1 0 x18 x36

1 1 1 x9 x36

x36 DEVICE

TABLE 3 



 BUS-MATCHING SET-UP

FULL FLAG OPERATION

The multi-queue flow-control device provides a single Full Flag output, FF.

The FF flag output provides a full status of the queue currently selected on the

write port for write operations. Internally the multi-queue flow-control device

monitors and maintains a status of the full condition of all queues within it, however

only the queue that is selected for write operations has its full status output to the

FF flag. This dedicated flag is often referred to as the “active queue full flag”.

COMMERCIAL AND INDUSTRIAL

TEMPERATURE RANGES

IDT72V51336/72V51346/72V51356 3.3V, MULTI-QUEUE FLOW-CONTROL DEVICES

(8 QUEUES) 36 BIT WIDE CONFIGURATION 589,824, 1,179,648 and 2,359,296 bits

When queue switches are being made on the write port, the FF flag output

will switch to the new queue and provide the user with the new queue status,

on the cycle after a new queue selection is made. The user then has a full status

for the new queue one cycle ahead of the WCLK rising edge that data can be

written into the new queue. That is, a new queue can be selected on the write

port via the WRADD bus, WADEN enable and a rising edge of WCLK. On the

next rising edge of WCLK, the FF flag output will show the full status of the newly

selected queue. On the second rising edge of WCLK following the queue

selection, data can be written into the newly selected queue provided that data

and enable setup & hold times are met.

Note, the FF flag will provide status of a newly selected queue one WCLK

cycle after queue selection, which is one cycle before data can be written to that

queue. This prevents the user from writing data to a queue that is full, (assuming

that a queue switch has been made to a queue that is actually full).

The FF flag is synchronous to the WCLK and all transitions of the FF flag occur

based on a rising edge of WCLK. Internally the multi-queue device monitors and

keeps a record of the full status for all queues. It is possible that the status of a

FF flag maybe changing internally even though that flag is not the active queue

flag (selected on the write port). A queue selected on the read port may

experience a change of its internal full flag status based on read operations.

See Figure 9, Write Queue Select, Write Operation and Full Flag Operation

and Figure 11, Full Flag Timing in Expansion Mode for timing information.

EXPANSION MODE - FULL FLAG OPERATION

When multi-queue devices are connected in Expansion mode the FF flags

of all devices should be connected together, such that a system controller

monitoring and managing the multi-queue devices write port only looks at a

single FF flag (as opposed to a discrete FF flag for each device). This FF flag

is only pertinent to the queue being selected for write operations at that time.

Remember, that when in expansion mode only one multi-queue device can be

written to at any moment in time, thus the FF flag provides status of the active

queue on the write port.

This connection of flag outputs to create a single flag requires that the FF flag

output have a High-Impedance capability, such that when a queue selection is

made only a single device drives the FF flag bus and all other FF flag outputs

connected to the FF flag bus are placed into High-Impedance. The user does

not have to select this High-Impedance state, a given multi-queue flow-control

device will automatically place its FF flag output into High-Impedance when none

of its queues are selected for write operations.

When queues within a single device are selected for write operations, the FF

flag output of that device will maintain control of the FF flag bus. Its FF flag will

simply update between queue switches to show the respective queue full status.

The multi-queue device places its FF flag output into High-Impedance based

on the 3 bit ID code found in the 3 most significant bits of the write queue address

bus, WRADD. If the 3 most significant bits of WRADD match the 3 bit ID code setup

on the static inputs, ID0, ID1 and ID2 then the FF flag output of the respective

device will be in a Low-Impedance state. If they do not match, then the FF flag

output of the respective device will be in a High-Impedance state. See Figure

11, Full Flag Timing in Expansion Mode for details of flag operation, including

when more than one device is connected in expansion.

OUTPUT VALID FLAG OPERATION

The multi-queue flow-control device provides a single Output Valid flag

output, OV. The OV provides an empty status or data output valid status for the

data word currently available on the output register of the read port. The rising

edge of an RCLK cycle that places new data onto the output register of the read

port, also updates the OV flag to show whether or not that new data word is

actually valid. Internally the multi-queue flow-control device monitors and

maintains a status of the empty condition of all queues within it, however only

the queue that is selected for read operations has its output valid (empty) status

output to the OV flag, giving a valid status for the word being read at that time.

The nature of the first word fall through operation means that when the last

data word is read from a selected queue, the OV flag will go HIGH on the next

enabled read, that is, on the next rising edge of RCLK while REN is LOW.

When queue switches are being made on the read port, the OV flag will switch

to show status of the new queue in line with the data output from the new queue.

When a queue selection is made the first data from that queue will appear on

the Qout data outputs 2 RCLK cycles later, the OV will change state to indicate

validity of the data from the newly selected queue on this 2nd RCLK cycle also.

The previous cycles will continue to output data from the previous queue and

the OV flag will indicate the status of those outputs. Again, the OV flag always

indicates status for the data currently present on the output register.

The OV flag is synchronous to the RCLK and all transitions of the OV flag occur

based on a rising edge of RCLK. Internally the multi-queue device monitors and

keeps a record of the output valid (empty) status for all queues. It is possible that

the status of an OV flag may be changing internally even though that respective

flag is not the active queue flag (selected on the read port). A queue selected

on the write port may experience a change of its internal OV flag status based

on write operations, that is, data may be written into that queue causing it to

become “not empty”.

See Figure 12, Read Queue Select, Read Operation and Figure 13, Output

Valid Flag Timing for details of the timing.

EXPANSION MODE – OUTPUT VALID FLAG OPERATION

When multi-queue devices are connected in Expansion mode, the OV flags

of all devices should be connected together, such that a system controller

monitoring and managing the multi-queue devices read port only looks at a

single OV flag (as opposed to a discrete OV flag for each device). This OV flag

is only pertinent to the queue being selected for read operations at that time.

Remember, that when in expansion mode only one multi-queue device can be

read from at any moment in time, thus the OV flag provides status of the active

queue on the read port.

This connection of flag outputs to create a single flag requires that the OV flag

output have a High-Impedance capability, such that when a queue selection is

made only a single device drives the OV flag bus and all other OV flag outputs

connected to the OV flag bus are placed into High-Impedance. The user does

not have to select this High-Impedance state, a given multi-queue flow-control

device will automatically place its OV flag output into High-Impedance when none

of its queues are selected for read operations.

When queues within a single device are selected for read operations, the OV

flag output of that device will maintain control of the OV flag bus. Its OV flag will

simply update between queue switches to show the respective queue output

valid status.

The multi-queue device places its OV flag output into High-Impedance based

on the 3 bit ID code found in the 3 most significant bits of the read queue address

bus, RDADD. If the 3 most significant bits of RDADD match the 3 bit ID code setup

on the static inputs, ID0, ID1 and ID2 then the OV flag output of the respective

device will be in a Low-Impedance state. If they do not match, then the OV flag

output of the respective device will be in a High-Impedance state. See Figure

13, Output Valid Flag Timing for details of flag operation, including when more

than one device is connected in expansion.

ALMOST FULL FLAG

As previously mentioned the multi-queue flow-control device provides a

single Programmable Almost Full flag output, PAF. The PAF flag output provides

a status of the almost full condition for the active queue currently selected on the

IDT72V51336/72V51346/72V51356 3.3V, MULTI-QUEUE FLOW-CONTROL DEVICES

(8 QUEUES) 36 BIT WIDE CONFIGURATION 589,824, 1,179,648 and 2,359,296 bits

COMMERCIAL AND INDUSTRIAL

TEMPERATURE RANGES

write port for write operations. Internally the multi-queue flow-control device

monitors and maintains a status of the almost full condition of all queues within

it, however only the queue that is selected for write operations has its full status

output to the PAF flag. This dedicated flag is often referred to as the “active queue

almost full flag”. The position of the PAF flag boundary within a queue can be

at any point within that queues depth. This location can be user programmed

via the serial port or one of the default values (8 or 128) can be selected if the

user has performed default programming.

As mentioned, every queue within a multi-queue device has its own almost

full status, when a queue is selected on the write port, this status is output via the

PAF flag. The PAF flag value for each queue is programmed during multi-queue

device programming (along with the number of queues, queue depths and

almost empty values). The PAF offset value, m, for a respective queue can be

programmed to be anywhere between ‘0’ and ‘D’, where ‘D’ is the total memory

depth for that queue. The PAF value of different queues within the same device

can be different values.

When queue switches are being made on the write port, the PAF flag output

will switch to the new queue and provide the user with the new queue status,

on the second cycle after a new queue selection is made, on the same WCLK

cycle that data can actually be written to the new queue. That is, a new queue

can be selected on the write port via the WRADD bus, WADEN enable and a

rising edge of WCLK. On the second rising edge of WCLK following a queue

selection, the PAF flag output will show the full status of the newly selected queue.

The PAF is flag output is double register buffered, so when a write operation

occurs at the almost full boundary causing the selected queue status to go almost

full the PAF will go LOW 2 WCLK cycles after the write. The same is true when

a read occurs, there will be a 2 WCLK cycle delay after the read operation.

So the PAF flag delays are:

from a write operation to PAF flag LOW is 2 WCLK + tWAF

The delay from a read operation to PAF flag HIGH is tSKEW2 + WCLK + tWAF

Note, if tSKEW is violated there will be one added WCLK cycle delay.

The PAF flag is synchronous to the WCLK and all transitions of the PAF flag

occur based on a rising edge of WCLK. Internally the multi-queue device

monitors and keeps a record of the almost full status for all queues. It is possible

that the status of a PAF flag maybe changing internally even though that flag is

not the active queue flag (selected on the write port). A queue selected on the

read port may experience a change of its internal almost full flag status based

on read operations. The multi-queue flow-control device also provides a

duplicate of the PAF flag on the PAF[3:0] flag bus, this will be discussed in detail

in a later section of the data sheet.

See Figures 22 and 23 for Almost Full flag timing and queue switching.

ALMOST EMPTY FLAG

As previously mentioned the multi-queue flow-control device provides a

single Programmable Almost Empty flag output, PAE. The PAE flag output

provides a status of the almost empty condition for the active queue currently

selected on the read port for read operations. Internally the multi-queue flow-

control device monitors and maintains a status of the almost empty condition of

all queues within it, however only the queue that is selected for read operations

has its empty status output to the PAE flag. This dedicated flag is often referred

to as the “active queue almost empty flag”. The position of the PAE flag boundary

within a queue can be at any point within that queues depth. This location can

be user programmed via the serial port or one of the default values (8 or 128)

can be selected if the user has performed default programming.

As mentioned, every queue within a multi-queue device has its own almost

empty status, when a queue is selected on the read port, this status is output via

the PAE flag. The PAE flag value for each queue is programmed during multi-

queue device programming (along with the number of queues, queue depths

and almost full values). The PAE offset value, n, for a respective queue can be

programmed to be anywhere between ‘0’ and ‘D’, where ‘D’ is the total memory

depth for that queue. The PAE value of different queues within the same device

can be different values.

When queue switches are being made on the read port, the PAE flag output

will switch to the new queue and provide the user with the new queue status,

on the second cycle after a new queue selection is made, on the same RCLK

cycle that data actually falls through to the output register from the new queue.

That is, a new queue can be selected on the read port via the RDADD bus,

RADEN enable and a rising edge of RCLK. On the second rising edge of RCLK

following a queue selection, the data word from the new queue will be available

at the output register and the PAE flag output will show the empty status of the

newly selected queue. The PAE is flag output is double register buffered, so

when a read operation occurs at the almost empty boundary causing the

selected queue status to go almost empty the PAE will go LOW 2 RCLK cycles

after the read. The same is true when a write occurs, there will be a 2 RCLK

cycle delay after the write operation.

So the PAE flag delays are:

from a read operation to PAE flag LOW is 2 RCLK + tRAE

The delay from a write operation to PAE flag HIGH is tSKEW2 + RCLK + tRAE

Note, if tSKEW is violated there will be one added RCLK cycle delay.

The PAE flag is synchronous to the RCLK and all transitions of the PAE flag

occur based on a rising edge of RCLK. Internally the multi-queue device

monitors and keeps a record of the almost empty status for all queues. It is possible

that the status of a PAE flag maybe changing internally even though that flag is

not the active queue flag (selected on the read port). A queue selected on the

write port may experience a change of its internal almost empty flag status based

on write operations. The multi-queue flow-control device also provides a

duplicate of the PAE flag on the PAE[3:0] flag bus, this will be discussed in detail

in a later section of the data sheet.

See Figures 24 and 25 for Almost Empty flag timing and queue switching.

COMMERCIAL AND INDUSTRIAL

TEMPERATURE RANGES

IDT72V51336/72V51346/72V51356 3.3V, MULTI-QUEUE FLOW-CONTROL DEVICES

(8 QUEUES) 36 BIT WIDE CONFIGURATION 589,824, 1,179,648 and 2,359,296 bits

TABLE 4 — FLAG OPERATION BOUNDARIES & TIMING

Output Valid, OV Flag Boundary

I/O Set-Up OV Boundary Condition

In36 to out36 (Almost Empty Mode) OV Goes LOW after 1st Write

(Both ports selected for same queue (see note 1 below for timing)

when the 1st Word is written in)

In36 to out36 (Packet Mode) OV Goes LOW after 1st Write

(Both ports selected for same queue (see note 2 below for timing)

when the 1st Word is written in)

In36 to out18 OV Goes LOW after 1st Write

(Both ports selected for same queue (see note 1 below for timing)

when the 1st Word is written in)

In36 to out9 OV Goes LOW after 1st Write

(Both ports selected for same queue (see note 1 below for timing)

when the 1st Word is written in)

In18 to out36 OV Goes LOW after 1st Write

(Both ports selected for same queue (see note 1 below for timing)

when the 1st Word is written in)

In9 to out36 OV Goes LOW after 1st Write

(Both ports selected for same queue (see note 1 below for timing)

when the 1st Word is written in)

NOTE:

1. OV Timing

Assertion:

Write to OV LOW: tSKEW1 + RCLK + tROV

If tSKEW1 is violated there may be 1 added clock: tSKEW1 + 2 RCLK + tROV

De-assertion:

Read Operation to OV HIGH: tROV

2. OV Timing when in Packet Mode (36 in to 36 out only)

Assertion:

Write to OV LOW: tSKEW4 + RCLK + tROV

If tSKEW4 is violated there may be 1 added clock: tSKEW4 + 2 RCLK + tROV

De-assertion:

Read Operation to OV HIGH: tROV

Programmable Almost Full Flag, PAF & PAFn Bus Boundary

I/O Set-Up PAF & PAFn Boundary

in36 to out36 PAF/PAFn Goes LOW after

(Both ports selected for same queue when the 1st D+1-m Writes

Word is written in until the boundary is reached) (see note below for timing)

in36 to out36 PAF/PAFn Goes LOW after

(Write port only selected for same queue when the D-m Writes

1st Word is written in until the boundary is reached) (see note below for timing)

in36 to out18 PAF/PAFn Goes LOW after

D-m Writes (see below for timing)

in36 to out9 PAF/PAFn Goes LOW after

D-m Writes (see below for timing)

in18 to out36 PAF/PAFn Goes LOW after

([D+1-m] x 2) Writes

(see note below for timing)

in9 to out36 PAF/PAFn Goes LOW after

([D+1-m] x 4) Writes

(see note below for timing)

NOTE:

D = Queue Depth

m = Almost Full Offset value.

Default values: if DF is LOW at Master Reset then m = 8

if DF is HIGH at Master Reset then m= 128

PAF Timing

Assertion: Write Operation to PAF LOW: 2 WCLK + tWAF

De-assertion: Read to PAF HIGH: tSKEW2 + WCLK + tWAF

If tSKEW2 is violated there may be 1 added clock: tSKEW2 + 2 WCLK + tWAF

PAFn Timing

Assertion: Write Operation to PAFn LOW: 2 WCLK* + tPAF

De-assertion: Read to PAFn HIGH: tSKEW3 + WCLK* + tPAF

If tSKEW3 is violated there may be 1 added clock: tSKEW3 + 2 WCLK* + t PAF

* If a queue switch is occurring on the write port at the point of flag assertion or de-assertion

there may be one additional WCLK clock cycle delay.

NOTE:

D = Queue Depth

FF Timing

Assertion:

Write Operation to FF LOW: tWFF

De-assertion:

Read to FF HIGH: tSKEW1 + tWFF

If tSKEW1 is violated there may be 1 added clock: tSKEW1+WCLK +tWFF

Full Flag, FF Boundary

I/O Set-Up FF Boundary Condition

In36 to out36 FF Goes LOW after D+1 Writes

(Both ports selected for same queue (see note below for timing)

when the 1st Word is written in)

In36 to out36 FF Goes LOW after D Writes

(Write port only selected for queue (see note below for timing)

when the 1st Word is written in)

In36 to out18 FF Goes LOW after D Writes

(Both ports selected for same queue (see note below for timing)

when the 1st Word is written in)

In36 to out18 FF Goes LOW after D Writes

(Write port only selected for queue (see note below for timing)

when the 1st Word is written in)

In36 to out9 FF Goes LOW after D Writes

(Both ports selected for same queue (see note below for timing)

when the 1st Word is written in)

In36 to out9 FF Goes LOW after D Writes

(Write port only selected for queue (see note below for timing)

when the 1st Word is written in)

In18 to out36 FF Goes LOW after ([D+1] x 2) Writes

(Both ports selected for same queue (see note below for timing)

when the 1st Word is written in)

In18 to out36 FF Goes LOW after (D x 2) Writes

(Write port only selected for queue (see note below for timing)

when the 1st Word is written in)

In9 to out36 FF Goes LOW after ([D+1] x 4) Writes

(Both ports selected for same queue (see note below for timing)

when the 1st Word is written in)

In9 to out36 FF Goes LOW after (D x 4) Writes

(Write port only selected for queue (see note below for timing)

when the 1st Word is written in)

IDT72V51336/72V51346/72V51356 3.3V, MULTI-QUEUE FLOW-CONTROL DEVICES

(8 QUEUES) 36 BIT WIDE CONFIGURATION 589,824, 1,179,648 and 2,359,296 bits

COMMERCIAL AND INDUSTRIAL

TEMPERATURE RANGES

TABLE 4 — FLAG OPERATION BOUNDARIES & TIMING (CONTINUED)

NOTE:

n = Almost Empty Offset value.

Default values: if DF is LOW at Master Reset then n = 8

if DF is HIGH at Master Reset then n = 128

PAEn Timing

Assertion: Read Operation to PAEn LOW: 2 RCLK* + tPAE

De-assertion: Write to PAEn HIGH: tSKEW3 + RCLK* + tPAE

If tSKEW3 is violated there may be 1 added clock: tSKEW3 + 2 RCLK* + tPAE

* If a queue switch is occurring on the read port at the point of flag assertion or de-assertion

there may be one additional RCLK clock cycle delay.

Programmable Almost Empty Flag Bus, PAEn Boundary

I/O Set-Up PAEn Boundary Condition

in36 to out36 PAEn Goes HIGH after

(Both ports selected for same queue when the 1st n+2 Writes

Word is written in until the boundary is reached) (see note below for timing)

in36 to out36 PAEn Goes HIGH after

(Write port only selected for same queue when the n+1 Writes

1st Word is written in until the boundary is reached) (see note below for timing)

in36 to out18 PAEn Goes HIGH after n+1

Writes (see below for timing)

in36 to out9 PAEn Goes HIGH after n+1

Writes (see below for timing)

in18 to out36 PAEn Goes HIGH after

(Both ports selected for same queue when the 1st ([n+2] x 2) Writes

Word is written in until the boundary is reached) (see note below for timing)

in18 to out36 PAEn Goes HIGH after

(Write port only selected for same queue when the ([n+1] x 2) Writes

1st Word is written in until the boundary is reached) (see note below for timing)

in9 to out36 PAEn Goes HIGH after

(Both ports selected for same queue when the 1st ([n+2] x 4) Writes

Word is written in until the boundary is reached) (see note below for timing)

in9 to out36 PAEn Goes HIGH after

(Write port only selected for same queue when the ([n+1] x 4) Writes

1st Word is written in until the boundary is reached) (see note below for timing)

NOTE:

n = Almost Empty Offset value.

Default values: if DF is LOW at Master Reset then n = 8

if DF is HIGH at Master Reset then n = 128

PAE Timing

Assertion: Read Operation to PAE LOW: 2 RCLK + tRAE

De-assertion: Write to PAE HIGH: tSKEW2 + RCLK + tRAE

If tSKEW2 is violated there may be 1 added clock: tSKEW2 + 2 RCLK + tRAE

Programmable Almost Empty Flag, PAE Boundary

I/O Set-Up PAE Assertion

in36 to out36 PAE Goes HIGH after n+2

(Both ports selected for same queue when the 1st Writes

Word is written in until the boundary is reached) (see note below for timing)

in36 to out18 PAE Goes HIGH after n+1

(Both ports selected for same queue when the 1st Writes

Word is written in until the boundary is reached) (see note below for timing)

in36 to out9 PAE Goes HIGH after n+1

(Both ports selected for same queue when the 1st Writes

Word is written in until the boundary is reached) (see note below for timing)

in18 to out36 PAE Goes HIGH after

(Both ports selected for same queue when the 1st ([n+2] x 2) Writes

Word is written in until the boundary is reached) (see note below for timing)

in9 to out36 PAE Goes HIGH after

(Both ports selected for same queue when the 1st ([n+2] x 4) Writes

Word is written in until the boundary is reached) (see note below for timing)

PACKET READY FLAG, PR BOUNDARY

Assertion:

Both the rising and falling edges of PR are synchronous to RCLK.

PR Falling Edge occurs upon writing the first TEOP marker, on input D35,

(assuming a TSOP marker, on input D34 has previously been written). i.e. a

complete packet is available within a queue.

Timing:

From WCLK rising edge writing the TEOP word PR goes LOW after: tSKEW4

+ 2 RCLK + tPR

If tSKEW4 is violated:

PR goes LOW after tSKEW4 + 3 RCLK + tPR

(Please refer to Figure 26, Data Input (Transmit) Packet Mode of Operation

for timing diagram).

De-assertion:

PR Rising Edge occurs upon reading the last RSOP marker, from output Q34.

i.e. there are no more complete packets available within the queue.

Timing:

From RCLK rising edge Reading the RSOP word the PR goes HIGH after:

2 RCLK + tPR

(Please refer to Figure 27, Data Output (Receive) Packet Mode of Operation

for timing diagram).

PACKET READY FLAG BUS, PRn BOUNDARY

Assertion:

Both the rising and falling edges of PRn are synchronous to RCLK.

PRn Falling Edge occurs upon writing the first TEOP marker, on input D35,

(assuming a TSOP marker, on input D34 has previously been written). i.e. a

complete packet is available within a queue.

Timing:

From WCLK rising edge writing the TEOP word PR goes LOW after: tSKEW4

+ 2 RCLK* + tPAE

If tSKEW4 is violated PRn goes LOW after tSKEW4 + 3 RCLK* + tPAE

*If a queue switch is occurring on the read port at the point of flag assertion there

may be one additional RCLK clock cycle delay.

De-assertion:

PR Rising Edge occurs upon reading the last RSOP marker, from output Q34.

i.e. there are no more complete packets available within the queue.

Timing:

From RCLK rising edge Reading the RSOP word the PR goes HIGH after:

2 RCLK* + tPAE

*If a queue switch is occurring on the read port at the point of flag assertion or

de-assertion there may be one additional RCLK clock cycle delay.

COMMERCIAL AND INDUSTRIAL

TEMPERATURE RANGES

IDT72V51336/72V51346/72V51356 3.3V, MULTI-QUEUE FLOW-CONTROL DEVICES

(8 QUEUES) 36 BIT WIDE CONFIGURATION 589,824, 1,179,648 and 2,359,296 bits

PAFn BUS EXPANSION - DIRECT MODE

If FM is LOW at Master Reset then the PAFn bus operates in Direct

(addressed) mode. In direct mode the user can address the device they require

to control the PAFn bus. The address present on the 3 most significant bits of

the WRADD[5:0] address bus with FSTR (PAF flag strobe), HIGH will be

selected as the device on a rising edge of WCLK. So to address the first device

in a bank of devices the WRADD[5:0] address should be “000xxx” the second

device “001xxx” and so on. The 3 most significant bits of the WRADD[5:0]

address bus correspond to the device ID inputs ID[2:0]. The PAFn bus will

change status to show the new device selected 1 WCLK cycle after device

selection. Note, that if a read or write operation is occurring to a specific queue,

say queue ‘x’ on the same cycle as a PAFn bus switch to the device containing

queue ‘x’, then there may be an extra WCLK cycle delay before that queues

status is correctly shown on the respective output of the PAFn bus. However,

the “active” PAF flag will show correct status at all times.

Devices can be selected on consecutive WCLK cycles, that is the device

controlling the PAFn bus can change every WCLK cycle. Also, data present

on the input bus, Din, can be written into a queue on the same WLCK rising edge

that a device is being selected on the PAFn bus, the only restriction being that

a write queue selection and PAFn bus selection cannot be made on the same

cycle.

PAFn BUS EXPANSION– POLLED MODE

If FM is HIGH at Master Reset then the PAFn bus operates in Polled (Looped)

mode. In polled mode the PAFn bus automatically cycles through the devices

connected in expansion. In expansion mode one device will be set as the

Master, MAST input tied HIGH, all other devices will have MAST tied LOW. The

master device is the first device to take control of the PAFn bus and place the

PAF status of its queues onto the bus on the first rising edge of WCLK after the

MRS input goes HIGH once a Master Reset is complete. The FSYNC (PAF sync

pulse) output of the first device (master device), will be HIGH for one cycle of

WCLK indicating that it is has control of the PAFn bus for that cycle.

The device also passes a “token” onto the next device in the chain, the next

device assuming control of the PAFn bus on the next WCLK cycle. This token

passing is done via the FXO outputs and FXI inputs of the devices (“PAFn

Expansion Out” and “PAFn Expansion In”). The FXO output of the first device

connecting to the FXI input of the second device in the chain, the FXO of the

second device connects to the FXI of the third device and so on. The FXO of

the final device in a chain connects to the FXI of the first device, so that once the

PAFn bus has cycled through all devices control is again passed to the first

device. The FXO output of a device will be HIGH for the WCLK cycle it has control

of the bus.

Please refer to Figure 28,

PAF

n Bus – Polled Mode for timing information.

PAEn/PRn FLAG BUS OPERATION

The IDT72V51336/72V51346/72V51356 multi-queue flow-control devices

can be configured for up to 8 queues, each queue having its own almost empty/

packet ready status. An active queue has its flag status output to the discrete flags,

OV, PAE and PR, on the read port. Queues that are not selected for a read

operation can have their PAE/PR status monitored via the PAEn/PRn bus. The

PAEn/PRn flag bus is 8 bits wide, so that all 8 queues can have their status output

to the bus. The multi-queue device can provide either “Almost Empty” status or

“Packet Ready” status via the PAEn/PRn bus of its queues, depending on which

has been selected via the PKT (Packet) input during a master reset. If PKT is

HIGH then packet mode is selected and the PAEn/PRn bus will provide “Packet

Ready” status. If it is LOW then the PAEn/PRn bus will provide “Almost Empty”

status. In either case the operation of the bus is the same the difference being

that the bus is providing “Packet Ready” status versus “Almost Empty” status.

When a single multi-queue device is used anywhere from 1 to 8 queues may

be set-up within the part, each queue having its own dedicated PAEn/PRn flag

output on the PAEn/PRn bus. Queues 1 through 8 have their PAE/PR status

to PAE[0] through PAE[7] respectively. If less than 8 queues are used then only

the associated PAEn/PRn outputs will be required, unused PAEn/PRn outputs

will be don’t care outputs. When devices are connected in expansion mode the

PAEn/PRn flag bus can also be expanded beyond 8 bits to produce a wider

PAEn/PRn bus that encompasses all queues.

Alternatively, the 8 bit PAEn/PRn flag bus of each device can be connected

together to form a single 8 bit bus, i.e. PAE[0] of device 1 will connect to PAE[0]

of device 2 etc. When connecting devices in this manner the PAEn/PRn bus can

only be driven by a single device at any time, (the PAEn/PRn outputs of all other

devices must be in high impedance state). There are two methods by which the

user can select which device has control of the bus, these are “Direct”

(Addressed) mode or “Polled” (Looped) mode, determined by the state of the

FM (flag Mode) input during a Master Reset.

PAEn/PRn BUS EXPANSION- DIRECT MODE

If FM is LOW at Master Reset then the PAEn/PRn bus operates in Direct

(addressed) mode. In direct mode the user can address the device they require

to control the PAEn/PRn bus. The address present on the 3 most significant bits

of the RDADD[6:0] address bus with ESTR (PAE/PR flag strobe), HIGH will

be selected as the device on a rising edge of RCLK. So to address the first device

in a bank of devices the RDADD[6:0] address should be “000xxx” the second

device “001xxx” and so on. The 3 most significant bits of the RDADD[6:0]

address bus correspond to the device ID inputs ID[2:0]. The PAEn/PRn bus

will change status to show the new device selected 1 RCLK cycle after device

selection. Note, that if a read or write operation is occurring to a specific queue,

say queue ‘x’ on the same cycle as a PAEn/PRn bus switch to the device

containing queue ‘x’, then there may be an extra RCLK cycle delay before that

queues status is correctly shown on the respective output of the PAEn/PRn bus.

However, the “active” PAE and/or PR flag will show correct status at all times.

Devices can be selected on consecutive RCLK cycles, that is the device

controlling the PAEn/PRn bus can change every RCLK cycle. Also, data can

be read out of a queue on the same RCLK rising edge that a device is being

selected on the PAEn/PRn bus, the only restriction being that a read queue

selection and PAEn/PRn bus selection cannot be made on the same cycle.

PAEn/PRn BUS EXPANSION- POLLED MODE

If FM is HIGH at Master Reset then the PAEn/PRn bus operates in Polled

(Looped) mode. In polled mode the PAEn/PRn bus automatically cycles through

the devices connected in expansion. In expansion mode one device will be set

as the Master, MAST input tied HIGH, all other devices will have MAST tied LOW.

The master device is the first device to take control of the PAEn/PRn bus and

place the PAE/PR status of its queues onto the bus on the first rising edge of RCLK

after the MRS input goes HIGH once a Master Reset is complete. The ESYNC

(PAE/PR sync pulse) output of the first device (master device), will be HIGH for

one cycle of RCLK indicating that it is has control of the PAEn/PRn bus for that

cycle.

The device also passes a “token” onto the next device in the chain, the next

device assuming control of the PAEn/PRn bus on the next RCLK cycle. This

token passing is done via the EXO outputs and EXI inputs of the devices (“PAEn/

PRn Expansion Out” and “PAEn/PRn Expansion In”). The EXO output of the

first device connecting to the EXI input of the second device in the chain, the EXO

of the second device connects to the EXI of the third device and so on. The EXO

of the final device in a chain connects to the EXI of the first device, so that once

IDT72V51336/72V51346/72V51356 3.3V, MULTI-QUEUE FLOW-CONTROL DEVICES

(8 QUEUES) 36 BIT WIDE CONFIGURATION 589,824, 1,179,648 and 2,359,296 bits

COMMERCIAL AND INDUSTRIAL

TEMPERATURE RANGES

the PAEn/PRn bus has cycled through all devices control is again passed to

the first device. The EXO output of a device will be HIGH for the RCLK cycle

it has control of the bus.

Please refer to Figure 29,

PAE

n Bus – Polled Mode for timing

information.

COMMERCIAL AND INDUSTRIAL

TEMPERATURE RANGES

IDT72V51336/72V51346/72V51356 3.3V, MULTI-QUEUE FLOW-CONTROL DEVICES

(8 QUEUES) 36 BIT WIDE CONFIGURATION 589,824, 1,179,648 and 2,359,296 bits

1st: Read from Queue

2nd: Read from Queue

3rd: Read from Queue

4th: Read from Queue

5936 drw08

Q35-Q27 Q26-Q18 Q17-Q9 Q8-Q0

(a) x36 INPUT to x36 OUTPUT

(b) x36 INPUT to x18 OUTPUT

Read from Queue

BM IW OW

1st: Read from Queue

2nd: Read from Queue

BYTE ORDER ON OUTPUT PORT:

Q35-Q27 Q26-Q18 Q17-Q9 Q8-Q0

1st: Write to Queue

2nd: Write to Queue

3rd: Write to Queue

4th: Write to Queue

BYTE ORDER ON INPUT PORT:

DCBA

(e) x9 INPUT to x36 OUTPUT

Read from Queue

BYTE ORDER ON OUTPUT PORT:

D35-D27 D26-D18 D17-D9 D8-D0

Q35-Q27 Q26-Q18 Q17-Q9 Q8-Q0

D35-D27 D26-D18 D17-D9 D8-D0

(d) x18 INPUT to x36 OUTPUT

Read from Queue

BYTE ORDER ON INPUT PORT:

D35-D27 D26-D18 D17-D9 D8-D0

1st: Write to Queue

2nd: Write to Queue

BYTE ORDER ON OUTPUT PORT:

D35-D27 D26-D18 D17-D9 D8-D0

ABC D

Write to Queue

BYTE ORDER ON INPUT PORT:

BM IW OW

Figure 3. Bus-Matching Byte Arrangement

IDT72V51336/72V51346/72V51356 3.3V, MULTI-QUEUE FLOW-CONTROL DEVICES

(8 QUEUES) 36 BIT WIDE CONFIGURATION 589,824, 1,179,648 and 2,359,296 bits

COMMERCIAL AND INDUSTRIAL

TEMPERATURE RANGES

tRSF

PAF

tRSF

PAE

tRSF

tRSF LOGIC "1" if OE is LOW and device is Master

HIGH-Z if OE is HIGH or Device is Slave

HIGH-Z if Slave Device

LOGIC “0" if Master Device

LOGIC "1" if Master Device

HIGH-Z if Slave Device

LOGIC "1" if Master Device

HIGH-Z if Slave Device

LOGIC "0" if Master Device

HIGH-Z if Slave Device

LOGIC "0" if Master Device

LOGIC "1" if Master Device

HIGH-Z if Slave Device

LOGIC "1" if Master Device

HIGH-Z if Slave Device

LOGIC "1" if Master Device

HIGH-Z if Slave Device

PAFn

PAEn

PRn

tRS

MRS

WEN

REN

tRSS

FSTR,

ESTR

5936 drw09

tRSR

SENI

WADEN,

RADEN

tRSS

OW, IW,

HIGH = Looped

LOW = Strobed (Direct)

ID0, ID1,

ID2

tRSS

HIGH = Packet Ready Mode

LOW = Almost Empty

MAST

PKT

DFM

HIGH = Master Device

LOW = Slave Device

HIGH = Default Programming

LOW = Serial Programming

HIGH = Offset Value is 128

LOW = Offset value is 8

tRSS

Figure 4. Master Reset

NOTES:

1. OE can toggle during this period.

2. PRS should be HIGH during a MRS.

COMMERCIAL AND INDUSTRIAL

TEMPERATURE RANGES

IDT72V51336/72V51346/72V51356 3.3V, MULTI-QUEUE FLOW-CONTROL DEVICES

(8 QUEUES) 36 BIT WIDE CONFIGURATION 589,824, 1,179,648 and 2,359,296 bits

Figure 6. Serial Port Connection for Serial Programming

DFM MRS

SENI SENO

MQ1

SI SO

SCLK

DFM MRS

SENI SENO

MQ2

SI SO

SCLK

DFM MRS

SENI SENO

MQn

SI SO

SCLK

Serial Enable

Serial Input

Serial Clock

Default Mode

DFM = 0

Master Reset

Serial Loading

Complete

5936 drw11

Figure 5. Partial Reset

NOTES:

1. For a Partial Reset to be performed on a Queue, that Queue must be selected on both the write and read ports.

2. The queue must be selected a minimum of 2 clock cycles before the Partial Reset takes place, on both the write and read ports.

3. The Partial Reset must be LOW for a minimum of 1 WCLK and 1 RCLK cycle.

4. Writing or Reading to the queue (or a queue change) cannot occur until a minimum of 3 clock cycles after the Partial Reset has gone HIGH, on both the write and read ports.

5. The PAF flag output for Qx on the PAFn flag bus may update one cycle later than the active PAF flag.

6. The PAE flag output for Qx on the PAEn flag bus may update one cycle later than the active PAE flag.

WCLK

RCLK

RDADD

RADEN

r-2 r-1 r

PRS

r+2

r+1

PRSH

PRSS

REN

ENS

r+3

ENS

ROV

RAE

PAE

5936 drw10

WEN

WADEN

WRADD Qx

w-2 w-1 w w+1 w+2

ENS

w+3

ENS

WFF

PAF

WAF

Active Bus

PAF-Qx

(5)

PAF

Active Bus

PAE-Qx

(6)

PAE

PRSH

PRSS

IDT72V51336/72V51346/72V51356 3.3V, MULTI-QUEUE FLOW-CONTROL DEVICES

(8 QUEUES) 36 BIT WIDE CONFIGURATION 589,824, 1,179,648 and 2,359,296 bits

COMMERCIAL AND INDUSTRIAL

TEMPERATURE RANGES

Figure 7. Serial Programming

RCLK

WEN

SENO

(MQ1)

WADEN/

FSTR

RADEN/

ESTR

WCLK

5936 drw12

WFF

ENS

ROV

PCWQ

PCRQ

HIGH - Z

(Slave Device)

(MQ1)

MRS

SCLK

SENI

(MQ1)

RSR

SENO

1st 2nd nth 1st 2nd nth 1st 2nd nth

SENS

SENO

(MQ2)

SENO

(MQ8)

B21

SDS

SDH

SENO

SCLK

SCKL

SCKH

Programming Complete

1st Device in Chain 2nd Device in Chain Final Device in Chain

SDO

SDOP

SENOP

NOTES:

1. SENI can be toggled during serial loading. Once serial programming of a device is complete, the SENI and SI inputs become transparent. SENI → SENO and SI → SO.

2. DFM is LOW during Master Reset to provide Serial programming mode, DF is don't care.

3. When SENO of the final device is LOW no further serial loads will be accepted.

4. n = 19+(Qx72); where Q is the number of queues required for the IDT72V51336/72V51346/72V51356.

5. This diagram illustrates 8 devices in expansion.

6. Programming of all devices must be complete (SENO of the final device is LOW), before any write or read port operations can take place, this includes queue selections.

COMMERCIAL AND INDUSTRIAL

TEMPERATURE RANGES

IDT72V51336/72V51346/72V51356 3.3V, MULTI-QUEUE FLOW-CONTROL DEVICES

(8 QUEUES) 36 BIT WIDE CONFIGURATION 589,824, 1,179,648 and 2,359,296 bits

DFM MRS

SENI SENO

MQ1

WCLK

Serial Enable

(can be tied LOW)

WCLK

Default Mode

DFM = 1

Master Reset

Serial Loading

Complete

DFM MRS

SENI SENO

MQ2

WCLK

DFM MRS

SENI SENO

MQn

WCLK

RCLK

WEN

WADEN/

FSTR

RADEN/

ESTR

5936 drw12a

tWFF

tENS

tROV

tPCWQ

tQS tQH

tPCRQ

HIGH - Z

(Slave Device)

SENO

(MQ1)

tSENO

SENO

(MQ2)

SENO

(MQ8)

tSENO

WCLK

MRS

1st Device in Chain

1st 2nd nth

3rd

2nd Device in Chain

1st 2nd nth

Final Device in Chain

1st 2nd nth

Programming

Complete

tSENO

Serial Port Connection for Default Programming

SI SO XSI SOXSI SOX

Figure 8. Default Programming

NOTES:

1. This diagram illustrates multiple devices connected in expansion.

The SENO of the final device in a chain is the "programming complete" signal.

2. SENI of the first device in the chain can be held LOW

3. The SENO of a device should connect to the SENI of the next device in the chain.

The final device SENO is used to indicate programming complete.

4. When Default Programming is complete the SENO of the final device will go LOW.

5. SCLK is not used and can be tied LOW.

6. Programming of all devices must be complete (SENO of the final device is LOW),

before any write or read port operations can take place, this includes queue selections.

IDT72V51336/72V51346/72V51356 3.3V, MULTI-QUEUE FLOW-CONTROL DEVICES

(8 QUEUES) 36 BIT WIDE CONFIGURATION 589,824, 1,179,648 and 2,359,296 bits

COMMERCIAL AND INDUSTRIAL

TEMPERATURE RANGES

Figure 9. Write Queue Select, Write Operation and Full Flag Operation

WCLK

WADEN

tQH

tQS

tAH

tAS

WRADD

tWFF

5936 drw13

WEN

tENS

tAH

tAS

tQH

tQS

tDH

tDS

tDH

Qy WD-2 WD-1 Qy

tDH

Din

tWFF tWFF

Previous Q Status

No Writes

Queue Full

*A* *B* *C* *D* *E* *F* *G*

tDS

Qy WD

tDS tDH

tENH

tWFF tWFF

RCLK

tSKEW1

tQS tQH

REN

tENS

RDADD

RADEN

Qout

Previous Q, Word, W Previous Q, W

PFT

Qy, W

PFT

tAtA

Qy, W

*H* *I* *J*

tAS tAH

*AA* *BB* *CC* *DD

*EE* *FF*

tDS

NOTE:

OE is active LOW.

Cycle:

*A* Queue, Qx is selected on the write port.

The FF flag is providing status of a previously selected queue, within the same device.

*AA* Queue, Qy is selected for read operations.

*B* The FF flag output updates to show the status of Qx, it is not full.

*BB* Word W+1 is read from the previous queue regardless of REN due to FWFT.

*C* Word, Wd is written into Qx. This causes Qx to go full.

*CC* Word, W0 is read from Qy regardless of REN, this is due to the FWFT effect.

*D* Queue, Qy is selected within the same device as Qx. A write to Qx cannot occur on this cycle because it is full, FF is LOW.

*DD* No reads occur, REN is HIGH.

*E* Again, a write to Qx cannot occur on this cycle because it is full, FF is LOW. The FF flag updates after time tWFF to show that queue, Qy is not full.

*EE* Word, W1 is read from Qy, this causes Qy to go “not full”, FF flag goes HIGH after time, tSKEW1 + tWFF. Note, if tSKEW1 is violated the time FF HIGH will be: tSKEW1 + WCLK + tWFF.

*F* Word, Wd-2 is written into Qy.

*FF* Word, W2 is read from Qy.

*G* Word, Wd-1 is written into Qy.

*H* Word, Wd is written into Qy, this causes Qy to go full, FF goes LOW.

*I* No writes occur to Qy.

*J* Qy goes “not full” based on reading word W1 from Qy on cycle *EE*.

COMMERCIAL AND INDUSTRIAL

TEMPERATURE RANGES

IDT72V51336/72V51346/72V51356 3.3V, MULTI-QUEUE FLOW-CONTROL DEVICES

(8 QUEUES) 36 BIT WIDE CONFIGURATION 589,824, 1,179,648 and 2,359,296 bits

5936 drw13a

W1 W2 W3

WCLK

ENH

WEN

RCLK

SKEW1

ENS

REN

W1 Qy

FWFT

W2 Qy

FWFT

W3 QyLast Word Read Out of Queue

Qout

ROV

ENS

Figure 10. Write Operations & First Word Fall Through

NOTES:

1. Qy has previously been selected on both the write and read ports.

2. OE is LOW.

3. The First Word Latency = tSKEW1 + RCLK + tA. If tSKEW1 is violated an additional RCLK cycle must be added.

IDT72V51336/72V51346/72V51356 3.3V, MULTI-QUEUE FLOW-CONTROL DEVICES

(8 QUEUES) 36 BIT WIDE CONFIGURATION 589,824, 1,179,648 and 2,359,296 bits

COMMERCIAL AND INDUSTRIAL

TEMPERATURE RANGES

WCLK

WADEN

WRADD

(Device 1)

FFLZ

5936 drw14

WEN

ENS

1 Q3

Din

WFF

HIGH-Z

RCLK

ENH

ENS

ENH

Addr=00111

WFF

1 Q0

FFHZ

WFF

HIGH-Z

(Device 2)

FFHZ

HIGH-Z

FFLZ

SKEW1

Addr=00100

RDADD

RADEN

*A* *B* *C* *D* *E* *F* *G* *H* *I*

No Write

*J*

Qout

Previous Q W

X-1

Previous Q W

PFT

-Q

Word W

PFT

*AA* *BB* *CC*

Addr=01010

Addr=001000

Figure 11. Full Flag Timing in Expansion Mode

NOTE:

1. REN = HIGH.

Cycle:

*A* Queue, Q3 of device 1 is selected on the write port.

The FF flag of device 1 is in High-Impedance, the write port of device 2 was previously selected.

WEN is HIGH so no write occurs.

*AA* Queue, Q0 of device 1 is selected on the read port.

*B* The FF flag of device 2 goes to High-Impedance and the FF flag of device 1 goes to Low-Impedance, logic HIGH indicating that D1 Q3 is not full.

WEN is HIGH so no write occurs.

*BB* Word, Wx is read from the previously selected queue, (due to FWFT).

*C* Word, Wd is written into Q3 of D1. This write operation causes Q3 to go full, FF goes LOW.

*CC* The first word from Q0 of D1 selected on cycle *AA* is read out, this occurred regardless of REN due to FWFT. This read caused Q0 to go not full, therefore the FF flag will go HIGH after: tSKEW1 + tWFF.

Note if tSKEW1 is violated the time to FF flag HIGH is tSKEW1 + WLCK + tWFF.

*D* Queue, Q0 of device 1 is selected on the write port. No write occurs on this cycle.

*E* The FF flag updates to show the status of D1 Q0, it is not full, FF goes HIGH.

*F* Word, Wd is written into Q0 of D1. This causes the queue to go full, FF goes LOW.

*G* No write occurs regardless of WEN, the FF flag is LOW preventing writes.

*H* The FF flag goes HIGH due to the read from Q0 of D1 on cycle *CC*. (This read is not an enabled read, it is due to the FWFT operation).

*I* Queue, Q2 of device 2 is selected on the write port.

*J* The FF flag of device 1 goes to High-Impedance, this device was deselected on the write port on cycle *I*. The FF flag of device 2 goes to Low-Impedance and provides status of Q2 of D2.

COMMERCIAL AND INDUSTRIAL

TEMPERATURE RANGES

IDT72V51336/72V51346/72V51356 3.3V, MULTI-QUEUE FLOW-CONTROL DEVICES

(8 QUEUES) 36 BIT WIDE CONFIGURATION 589,824, 1,179,648 and 2,359,296 bits

Figure 12. Read Queue Select, Read Operation

RCLK

5936 drw15

RDADD

RADEN

REN

ENS

ENH

ENS

OUT

Wn-3

Wn-2

Previous Q, Q

Wn-1

PFT

W1Q

ROV

Previous Q

*A* *B* *C* *D* *E* *F* *G* *H*

PFT

*I*

Cycle:

*A* Word Wn-3 is read from a previously selected queue Qp on the read port.

*B* Wn-2 is read.

*C* Reads are disabled, Wn-1 remains on the output bus.

*D* A new queue, QF is selected for read operations.

*E* Due to the First Word Fall Through (FWFT) effect, a read from the previous queue Qp will take place, Wn from Qp is placed onto the output bus regardless of REN.

*F* The next word available in the new queue, QF-W0 falls through to the output bus, again this is regardless of REN.

*G* A new queue, QG is selected for read operations. (This queue is an empty queue). Word, W1 is also read from QF.

*H* Word, W1 is read from QF. This occurs regardless of REN due to FWFT.

*I* Word W2 from QF remains on the output bus because QG is empty. The Output Valid Flag, OV goes HIGH to indicate that the current word is not valid, i.e. QG is empty.

W2 is the last word in QG.

IDT72V51336/72V51346/72V51356 3.3V, MULTI-QUEUE FLOW-CONTROL DEVICES

(8 QUEUES) 36 BIT WIDE CONFIGURATION 589,824, 1,179,648 and 2,359,296 bits

COMMERCIAL AND INDUSTRIAL

TEMPERATURE RANGES

Figure 13. Output Valid Flag Timing (In Expansion Mode)

RCLK

RADEN

tQHtQS

tAHtAS

RDADD D

(Device 1)

5936 drw16

tENS

REN

tAHtAS

tQH

tQS

Qout

(Device 1)

tROV

HIGH-Z

WCLK

(Device 2)

tOVHZ

tSKEW1

tAH

tAS

WRADD D

tQHtQS

WADEN

tDH

tDS

Din

Q3 WD Last Word

tOLZ

PFT W

e-1

Last Word

tOVLZ tROV tROV tROV

WEN

tENS tENH

*A* *B* *C* *D* *E* *F* *G* *H* *I*

Addr=001011 Addr=001010

Cycle:

*A* Queue 3 of Device 1 is selected for read operations. The OV is currently being driven by Device 2, a queue within device 2 is selected for reads. Device 2 also has control

of Qout bus, its Qout outputs are in Low-Impedance. This diagram only shows the Qout outputs of device 1. (Reads are disabled).

*B* Reads are now enabled. A word from the previously selected queue of Device 2 will be read out.

*C* The Qout of Device 1 goes to Low-Impedance and word Wd is read from Q3 of D1. This happens to be the last word of Q3. Device 2 places its Qout outputs into

High-Impedance, device 1 has control of the Qout bus. The OV flag of Device 2 goes to High-Impedance and Device 1 takes control of OV. The OV flag of Device 1 goes LOW

to show that Wd of Q3 is valid.

*D* Queue 2 of device 1 is selected for read operations. The last word of Q3 was read on the previous cycle, therefore OV goes HIGH to indicate that the data on the Qout is

not valid (Q3 was read to empty). Word, Wd remains on the output bus.

*E* The last word of Q3 remains on the Qout bus, OV is HIGH, indicating that this word has been previously read.

*F* The next word (We-1), available from the newly selected queue, Q2 of device 1 is now read out. This will occur regardless of REN, 2 RCLK cycles after queue selection

due to the FWFT operation. The OV flag now goes LOW to indicate that this word is valid.

*G* The last word, We is read from Q2, this queue is now empty.

*H* The OV flag goes HIGH to indicate that Q2 was read to empty on the previous cycle.

*I* Due to a write operation the OV flag goes LOW and data word W0 is read from Q2. The latency is: tSKEW1 + 1*RCLK + tROV.

COMMERCIAL AND INDUSTRIAL

TEMPERATURE RANGES

IDT72V51336/72V51346/72V51356 3.3V, MULTI-QUEUE FLOW-CONTROL DEVICES

(8 QUEUES) 36 BIT WIDE CONFIGURATION 589,824, 1,179,648 and 2,359,296 bits

Figure 14. Read Queue Selection with Reads Disabled

Figure 15. Read Queue Select, Read Operation and

Timing

RCLK

5936 drw17

RDADD

RADEN

REN

ENS

OUT QP

WD+1

WD+2

WX+1

ENS

ENH

WD+3 QP

WD+4

*A* *B* *C* *D* *E* *F* *G* *H* *I* *J*

ENH

RCLK

RADEN

RDADD Q

5936 drw18

Qout

ROV

OLZ

PFT

ENS

REN

Previous Data in O/P Register

No Read

QB is Empty

ROV

*B* *C* *E* *F**D**A* *H* *I**G*

ENH

ENS

OHZ

Cycle:

*A* Word Wd+1 is read from the previously selected queue, Qp.

*B* Reads are disabled, word Wd+1 remains on the output bus.

*C* A new queue, Qn is selected for read port operations.

*D* Due to FWFT operation Word, Wd+2 of Qp is read out regardless of REN.

*E* The next available word Wx of Qn is read out regardless of REN, 2 RCLK cycles after queue selection. This is FWFT operation.

*F* The queue, Qp is again selected.

*G* Word Wx+1 is read from Qn regardless of REN, this is due to FWFT.

*H* Word Wd+3 is read from Qp, this read occurs regardless of REN due to FWFT operation.

*I* Word Wd+4 is read from Qp.

*J* Reads are disabled on this cycle, therefore no further reads occur.

NOTES:

1. The Output Valid flag, OV is HIGH therefore the previously selected queue has been read to empty. The Output Enable input is Asynchronous, therefore the Qout output bus

will go to Low-Impedance after time tOLZ.

The data currently on the output register will be available on the output after time tOE. This data is the previous data on the output register, this is the last word read out of the

previous queue.

2. In expansion mode the OE inputs of all devices should be connected together. This allows the output busses of all devices to be High-Impedance controlled.

Cycle:

*A* Queue A is selected for reads. No data will fall through on this cycle, the previous queue was read to empty.

*B* No data will fall through on this cycle, the previous queue was read to empty.

*C* Word, W0 from Qa is read out regardless of REN due to FWFT operation. The OV flag goes LOW indicating that Word W0 is valid.

*D* Reads are disabled therefore word, W0 of Qa remains on the output bus.

*E* Reads are again enabled so word W1 is read from Qa.

*F* Word W2 is read from Qa.

*G* Queue, Qb is selected on the read port. This queue is actually empty. Word, W3 is read from Qa.

*H* Word, W4 falls through from Qa.

*I* Output Valid flag, OV goes HIGH to indicate that Qb is empty. Data on the output port is no longer valid.

Output Enable is taken HIGH, this is Asynchronous so the output bus goes to High-Impedance after time, tOHZ.

IDT72V51336/72V51346/72V51356 3.3V, MULTI-QUEUE FLOW-CONTROL DEVICES

(8 QUEUES) 36 BIT WIDE CONFIGURATION 589,824, 1,179,648 and 2,359,296 bits

COMMERCIAL AND INDUSTRIAL

TEMPERATURE RANGES

Figure 16. Writing in Packet Mode during a Queue change

NOTE:

1 . Do not Write an SOP or EOP on "C" or "I". A filler word is needed.

WCLK

WRADD Q

WADEN

Din Q

Data Q

TEOP Q

Dummy Q

TSOP Q

Data Q

TEOP Q

Dummy Q

TSOP

WEN

TEOP

(D35)

TSOP

(D34)

(1)

DE F G H I

(1)

12 12

Data Q

Data

5936 drw19

COMMERCIAL AND INDUSTRIAL

TEMPERATURE RANGES

IDT72V51336/72V51346/72V51356 3.3V, MULTI-QUEUE FLOW-CONTROL DEVICES

(8 QUEUES) 36 BIT WIDE CONFIGURATION 589,824, 1,179,648 and 2,359,296 bits

Figure 17. Reading in Packet Mode during a Queue change

NOTE:

1 . Do not Read an SOP or EOP on "D" or "K". A filler word is needed.

RCLK

RDADD

RADEN

Qout

Data Q

REOP Q

“Dummy” Q

RSOP Q

“Dummy”

Data Q

Data

REN

REOP

(Q35)

RSOP

(Q34)

REOP

(1)

EFGH I J

(1)

RSOP

tAS tAH tAS tAH

1212

tAtAtAtAtAtAtAtA

5936 drw20

IDT72V51336/72V51346/72V51356 3.3V, MULTI-QUEUE FLOW-CONTROL DEVICES

(8 QUEUES) 36 BIT WIDE CONFIGURATION 589,824, 1,179,648 and 2,359,296 bits

COMMERCIAL AND INDUSTRIAL

TEMPERATURE RANGES

ENS

*A* *B*

ENH

P1Wo P1Wn

P1Wn

-1

P1Wn

-2

P1Wn

-3

*C*

WCLK

TSOP

(D34)

RCLK

TEOP

(D35)

WEN

D0-D31

TAEOP/ TMOD1

(D33)

TMOD2

(D32)

5936 drw21

ROV

P1Wo

SKEW5

Last Word Read Out

SKEW4

Figure 18. Data Input (Transmit) Packet Mode of Operation

NOTES:

1. REN is HIGH.

2. If tSKEW4 is violated PR may take one additional RCLK cycle.

3. If tSKEW5 is violated the OV may take one additional RCLK cycle.

4. PR will always go LOW on the same cycle or 1 cycle ahead of OV going LOW, (assuming the last word of the packet is the last word in the queue).

5. In Packet mode, words cannot be read from a queue until a complete packet has been written into that queue, regardless of REN.

COMMERCIAL AND INDUSTRIAL

TEMPERATURE RANGES

IDT72V51336/72V51346/72V51356 3.3V, MULTI-QUEUE FLOW-CONTROL DEVICES

(8 QUEUES) 36 BIT WIDE CONFIGURATION 589,824, 1,179,648 and 2,359,296 bits

RSOP

(Q34)

REOP

(Q35)

ENS

REN

Q0-Q31 P1Wo P1Wn

P1W1

RAEOP/ RMOD1

(Q33)

RMOD2

(Q32)

RCLK

P1Wn

-1

P1Wn

-2

P1Wn

-3

*A* *B* *D* *E*

5936 drw22

ROV

P1W2

*C*

Figure 19. Data Output (Receive) Packet Mode of Operation

NOTE:

1. In Packet mode, words cannot be read from a queue until a complete packet has been written into that queue, regardless of REN.

2. The PR flag will go HIGH on cycle *C* regardless of REN.

3. The OV flag will go HIGH (preventing further reads), when the last complete packet has been read out. If there is a partial packet (an incomplete packet) in the queue the OV flag will remain HIGH until further writes have

completed the packet.

IDT72V51336/72V51346/72V51356 3.3V, MULTI-QUEUE FLOW-CONTROL DEVICES

(8 QUEUES) 36 BIT WIDE CONFIGURATION 589,824, 1,179,648 and 2,359,296 bits

COMMERCIAL AND INDUSTRIAL

TEMPERATURE RANGES

RCLK

RADEN

Qout

REN

tAH

tAS

0001xxx

RDADD

NULL QUEUE

SELECT

*A* *B* *C* *E* *F*

tQH

tENS

Q1 Wn-3 Q1 Wn-2 Q1 Wn-1

tAtA

Q1 Wn

Q3 W0

FWFT

tROV tROV

5936 drw23

SELECT

NEW QUEUE

*D*

0000011

tAH

tAS

tQH

tQS

tENH

tQS

Figure 20. Read Operation and Null Queue Select

NOTES:

1 . The purpose of the Null queue operation is so that the user can stop reading a block (packet) of data from a queue without filling the 2 stage output pipeline with the next words

from that queue.

2. Please see Figure 21, Null Queue Flow Diagram.

Cycle:

*A* Null Q of device 0 is selected, when word Wn-1 from previously selected Q1 is read.

*B* REN is HIGH and Wn (Last Word of the Packet) of Q1 is pipelined onto the O/P register.

Note: *B* and *C* are a minimum 2 RCLK cycles between Q selects.

*C* The Null Q is seen as an empty queue on the read side, therefore Wn of Q1 remains in the O/P register and OV goes HIGH.

*D* A new Q, Q3 is selected and the 1st word of Q3 will fall through present on the O/P register on cycle *F*.

5936 drw24

Queue 1

Memory

*A*

Null

Queue

*B*

Null

Queue

*C*

O/P Reg.

*D* *E* *F*

Null

Queue

Queue 3

Memory

Queue 3

Memory

O/P Reg. O/P Reg. O/P Reg. O/P Reg. O/P Reg.

Wn-1

Figure 21. Null Queue Flow Diagram

COMMERCIAL AND INDUSTRIAL

TEMPERATURE RANGES

IDT72V51336/72V51346/72V51356 3.3V, MULTI-QUEUE FLOW-CONTROL DEVICES

(8 QUEUES) 36 BIT WIDE CONFIGURATION 589,824, 1,179,648 and 2,359,296 bits

WCLK

WADEN

WRADD D

PAF

(Device 1)

AFLZ

5936 drw25

WEN

ENS

D-m

Din

WAF

HIGH-Z

ENH

PAF

(Device 2)

FFHZ

*B* *C* *E* *F*

*D*

*A*

Figure 22. Almost Full Flag Timing and Queue Switch

Figure 23. Almost Full Flag Timing

WCLK

WEN

PAF

RCLK

tWAF

REN

5936 drw26

D - (m+1) words in Queue D - m words in Queue

121

D-(m+1) words

in Queue

WAF

ENH

ENS

SKEW2

ENH

ENS

CLKL

Cycle:

*A* Queue 2 of Device 1 is selected on the write port. A queue within Device 2 had previously been selected. The PAF output of device 1 is High-Impedance.

*B* No write occurs.

*C* Word, Wd-m is written into Q2 causing the PAF flag to go from HIGH to LOW. The flag latency is 2 WCLK cycles + tWAF.

*D* Queue 0 if device 1 is now selected for write operations. This queue is not almost full, therefore the PAF flag will update after a 2 WCLK + tWAF latency.

*E* The PAF flag goes LOW based on the write 2 cycles earlier.

*F* The PAF flag goes HIGH due to the queue switch to Q0.

NOTE:

1. The waveform here shows the PAF flag operation when no queue switches are occurring and a queue selected on both the write and read ports is being written to then read

from at the almost full boundary.

Flag Latencies:

Assertion: 2*WCLK + tWAF

De-assertion: tSKEW2 + WCLK + tWAF

If tSKEW2 is violated there will be one extra WCLK cycle.

IDT72V51336/72V51346/72V51356 3.3V, MULTI-QUEUE FLOW-CONTROL DEVICES

(8 QUEUES) 36 BIT WIDE CONFIGURATION 589,824, 1,179,648 and 2,359,296 bits

COMMERCIAL AND INDUSTRIAL

TEMPERATURE RANGES

Figure 24. Almost Empty Flag Timing and Queue Switch

Figure 25. Almost Empty Flag Timing

RCLK

RADEN

RDADD

PAE

(Device 1)

AELZ

5936 drw27

REN

OLZ

Qout

RAE

HIGH-Z

PAE

(Device 2)

AEHZ

HIGH

HIGH-Z

*B* *C* *E* *F*

*D*

*A*

n+1

*G*

WCLK

ENH

CLKH

CLKL

WEN

PAE

RCLK

ENS

n+1 words in Queue

RAE

SKEW2

RAE

REN 5936 drw28

ENS

ENH

n+2 words in Queue n+1 words in Queue

Cycle:

*A* Queue 3 of Device 1 is selected on the read port. A queue within Device 2 had previously been selected. The PAE flag output and the data outputs of device 1 are High-Impedance.

*B* No read occurs.

*C* The PAE flag output now switches to device 1. Word, Wn is read from Q3 due to the FWFT operation. This read operation from Q3 is at the almost empty boundary, therefore

PAE will go LOW 2 RCLK cycles later.

*D* Q1 of device 1 is selected.

*E* The PAE flag goes LOW due to the read from Q3 2 RCLK cycles earlier. Word Wn+1 is read out due to the FWFT operation.

*F* Word, W0 is read from Q1 due to the FWFT operation. The PAE flag goes HIGH to show that Q1 is not almost empty.

NOTE:

1. The waveform here shows the PAE flag operation when no queue switches are occurring and a queue selected on both the write and read ports is being written to then read

from at the almost empty boundary.

Flag Latencies:

Assertion: 2*RCLK + tRAE

De-assertion: tSKEW2 + RCLK + tRAE

If tSKEW2 is violated there will be one extra RCLK cycle.

COMMERCIAL AND INDUSTRIAL

TEMPERATURE RANGES

IDT72V51336/72V51346/72V51356 3.3V, MULTI-QUEUE FLOW-CONTROL DEVICES

(8 QUEUES) 36 BIT WIDE CONFIGURATION 589,824, 1,179,648 and 2,359,296 bits

WCLK

Prev PAEn

RCLK

ESTR

RDADD

Device 5

D5Q3

SKEW3

Previous value loaded on to PAE bus

xxx1xxx

Device 5

RADEN

STH

STS

PAE

5936 drw29

Device 5 PAE

RAE

*AA* *BB* *CC* *DD* *FF*

*EE*

RAE

D5 Qx Status

Bus PAEnPrevious value loaded on to PAE bus

Device 5

PAEHZ

PAEZL

xxx1xxx

REN

ENH

ENS

Device 5 -Qn Wy

D5 Q3

Wy+1

D5 Q3

Wy+3

D5 Q3

Wy+2

D5 Q3

Wa+1

D5 Qn

D5 Qx

WEN

WADEN

FSTR

WRADD D5Q3 D3Q2

D5 Q3

Wn+1

D5Q3

D3 Q2

0110010

Device 4

100xxxx

*A* *B* *C* *D* *E* *F*

ENS

ENH

STH

STS

Device 5 PAEn

ENS

ENH

Wp+1

Writes to Previous Q

RAE

D5 Q3

status

xxx1xxx

Device 5

xxx1xxx

1000011

1000011 101xxxx

Figure 26.

PAE

n - Direct Mode, Flag Operation – Devices in Expansion

Cycle:

*A* Queue 3 of Device 5 is selected for write operations.

Word, Wp is written into the previously selected queue.

*AA* Queue 3 of Device 5 is selected for read operations.

Another device has control of the PAEn bus.

The discrete PAE output of device 5 is currently in High-Impedance and the PAE active flag is controlled by the previously selected device.

*B* Word Wp+1 is written into the previously selected queue.

*BB* Word, Wa+1 is read from Qx of D5, due to FWFT operation.

*C* Word, Wn is written into the newly selected queue, Q3 of D5. This write will cause the PAE flag on the read port to go from LOW to HIGH (not almost empty) after time,

tSKEW3 + RCLK + tRAE (if tSKEW3 is violated one extra RCLK cycle will be added.

*CC* Word, Wy from the newly selected queue, Q3 will be read out due to FWFT operation.

Device 5 is selected on the PAEn bus. Q3 of device 5 will therefore have is PAE status output on PAE[3]. There is a single RCLK cycle latency before the PAEn bus changes

to the new selection.

*D* Queue 2 of Device 3 is selected for write operations.

Word Wn+1 is written into Q3 of D5.

*DD* The PAEn bus changes control to D5, the PAEn outputs of D5 go to Low-Impedance and are placed onto the outputs. The previously selected device now places its

PAEn outputs into High-Impedance to prevent bus contention. Word, Wy+1 is read from Q3 of D5.

The discrete PAE flag will go HIGH to show that Q3 of D5 is not almost empty. Q3 of device 5 will have its PAE status output on PAE[3].

*E* No writes occur.

*EE* Word, Wy+2 is read from Q3 of D5.

*F* Device 4 is selected on the write port for the PAFn bus.

Word, Wx is written into Q2 of D3.

*FF* The PAEn bus updates to show that Q3 of D5 is almost empty based on the reading out of word, Wy+1.

The discrete PAE flag goes LOW to show that Q3 of D5 is almost empty based on the reading of Wy+1.

IDT72V51336/72V51346/72V51356 3.3V, MULTI-QUEUE FLOW-CONTROL DEVICES

(8 QUEUES) 36 BIT WIDE CONFIGURATION 589,824, 1,179,648 and 2,359,296 bits

COMMERCIAL AND INDUSTRIAL

TEMPERATURE RANGES

RCLK

OLZ

REN

RADEN

ESTR

WRADD

0000001

RDADD D0Q1

D0 Q1

Device 7

1100010

*A* *B* *C* *D* *E

000xxxx

STH

STS

STH

STS

5936 drw30

*AA*

xxxxx0x

Device 0

Device 0 PAFn

Bus PAFn

*BB* *CC* *DD* *EE* *FF*

PAFLZ

xxxxx1x

Device 0 Device 0

PAF

xxxxx0x

Device 0 xxxxx1x

Device 0 Device 0xxxxx0x

Device

Prev. PAFnPrevious Device

PAFHZ

HIGH-Z

Device 0 PAF HIGH - Z

PAFLZ

WAF

Qout

D6Q2

Prev. Q

D-M+1

FSTR

WCLK

SKEW3

X +1

Prev. Q

D0 Q1

WEN

ENS

WADEN

D - M + 2

*G*

D0 Q1

D6 Q2

ENH

Din

Word W

D0 Q1

y+1

D0 Q1

y+2

D0 Q1

Device 0

111xxxx

Figure 27.

PAF

n - Direct Mode, Flag Operation – Devices in Expansion

Cycle:

*A* Queue 1 of device 0 is selected for read operations.

The last word in the output register is available on Qout. OE was previously taken LOW so the output bus is in Low-Impedance.

*AA* Device 0 is selected for the PAFn bus. The bus is currently providing status of a previously selected device X.

*B* Word, Wx+1 is read out from the previous queue due to the FWFT effect.

*BB* Queue 1 of device 0 is selected on the write port.

The PAFn bus is updated with the device selected on the previous cycle, device 0 PAF[1] is LOW showing the status of queue 1.

The PAFn outputs of the device previously selected on the PAFn bus go to High-Impedance.

*C* Device 7 is selected for the PAFn bus.

Word, Wd-m+1 is read from Q1 D0 due to the FWFT operation. This read is at the PAFn boundary of queue D0 Q1. This read will cause the PAF[1] output to go from

LOW to HIGH (almost full to not almost full), after a delay tSKEW3 + WCLK + tPAF. If tSKEW3 is violated add an extra WCLK cycle.

*CC* PAFn continues to show status of D0.

*D* No read operations occur, REN is HIGH.

*DD* PAF[1] goes HIGH to show that D0 Q1 is not almost empty due to the read on cycle *C*.

The active queue PAF flag of device 0 goes from High-Impedance to Low-Impedance.

Word, Wy is written into D0 Q1.

*E* Queue 2 of Device 6 is selected for write operations.

*EE* Word, Wy+1 is written into D0 Q1.

*F* Word, Wd-m+2 is read out due to FWFT operation.

*FF* PAF[1] and the discrete PAF flag go LOW to show the write on cycle *DD* causes Q1 of D0 to again go almost full.

Word, Wy+2 is written into D0 Q1.

*G* Word, W0 is read from Q0 of D6, selected on cycle *E*, due to FWFT.

COMMERCIAL AND INDUSTRIAL

TEMPERATURE RANGES

IDT72V51336/72V51346/72V51356 3.3V, MULTI-QUEUE FLOW-CONTROL DEVICES

(8 QUEUES) 36 BIT WIDE CONFIGURATION 589,824, 1,179,648 and 2,359,296 bits

WCLK

5936 drw31

tFSYNC tFSYNC

FSYNC0

(MASTER)

FXO0 /

FXI1

tFXO tFXO

tFSYNC tFSYNC

FSYNC1

(SLAVE)

FXO1 /

FXI2

tFXO tFXO

tFSYNC tFSYNC

FSYNC2

(SLAVE)

FXO2 /

FXI0

tFXO tFXO

PAF[7:0]

tPAF tPAF tPAF tPAF tPAF

Device 0 Device 1 Device 2 Device 0

tFSYNC tFSYNC

tFXO tFXO

Figure 28.

PAF

n Bus - Polled Mode

NOTE:

1. This diagram is based on 3 devices connected to expansion mode.

IDT72V51336/72V51346/72V51356 3.3V, MULTI-QUEUE FLOW-CONTROL DEVICES

(8 QUEUES) 36 BIT WIDE CONFIGURATION 589,824, 1,179,648 and 2,359,296 bits

COMMERCIAL AND INDUSTRIAL

TEMPERATURE RANGES

RCLK

5936 drw32

ESYNC

ESYNC0

EXO0 /

EXI1

EXO

ESYNC

ESYNC1

EXO1 /

FXI2

EXO

ESYNC

EXO2 /

EXI0

EXO

PAEn

PAE

Device 0 Device 1 Device 2 Device 0

ESYNC

EXO

Figure 29.

PAE

n Bus - Polled Mode

COMMERCIAL AND INDUSTRIAL

TEMPERATURE RANGES

IDT72V51336/72V51346/72V51356 3.3V, MULTI-QUEUE FLOW-CONTROL DEVICES

(8 QUEUES) 36 BIT WIDE CONFIGURATION 589,824, 1,179,648 and 2,359,296 bits

WRADD

WADEN

WCLK

WEN

FSTR

PAFn

FSYNC

SCLK

RCLK

REN

ESTR

PAEn

ESYNC

PAE

RDADD

RADEN

SO FXO EXO

SI FXI EXI

WRADD

WADEN

WCLK

WEN

FSTR

PAFn

FSYNC

PAF

SCLK

RCLK

REN

ESTR

PAEn

ESYNC

PAE

RDADD

RADEN

SO FXO EXO

SI FXI EXI

WRADD

WADEN

WCLK

WEN

FSTR

PAFn

FSYNC

PAF

SCLK

RCLK

REN

ESTR

PAEn

ESYNC

PAE

RDADD

RADEN

SENO FXO EXO

Q0-Q35

SI FXI EXI

Data Bus

Write Clock

Write Enable

Write Queue Select

Full Strobe

Programmable Almost Full

Write Address

Full Sync1

Full Flag

Almost Full Flag

Serial Clock

Output Data Bus

Read Clock

Read Enable

Read Queue Select

Empty Strobe

Programmable Almost Empty

Read Address

Empty Sync 1

Output Valid Flag

Almost Empty Flag

Serial Programming Data

Input

DEVICE

Full Sync2 Empty Sync 2

Full Sync n Empty Sync n

SENO

SENI

SENO

SENI

DONE 5936 drw33

D0-D35

Q0-Q35

D0-D35

D0-D35 Q0-Q35

SENI

PR Packet Reads

Serial Enable

Figure 30. Multi-Queue Expansion Diagram

NOTES:

1 . If devices are configured for Direct operation of the PAFn/PAEn flag busses the FXI/EXI of the MASTER device should be tied LOW. All other devices tied HIGH. The FXO/EXO

outputs are DNC (Do Not Connect).

2. Q outputs must not be mixed between devices, i.e. Q0 of device 1 must connect to Q0 of device 2, etc.

IDT72V51336/72V51346/72V51356 3.3V, MULTI-QUEUE FLOW-CONTROL DEVICES

(8 QUEUES) 36 BIT WIDE CONFIGURATION 589,824, 1,179,648 and 2,359,296 bits

COMMERCIAL AND INDUSTRIAL

TEMPERATURE RANGES

TAP

Cont-

roller

Mux

DeviceID Reg.

Boundary Scan Reg.

Bypass Reg.

clkDR, ShiftDR

UpdateDR

TDO

TDI

TMS

TCLK

TRST

clklR, ShiftlR

UpdatelR

Instruction Register

Instruction Decode

Control Signals

5936 drw34

JTAG INTERFACE

Five additional pins (TDI, TDO, TMS, TCK and TRST) are provided to

support the JTAG boundary scan interface. The IDT72V51336/72V51346/

72V51356 incorporates the necessary tap controller and modified pad cells to

implement the JTAG facility.

Note that IDT provides appropriate Boundary Scan Description Language

program files for these devices.

The Standard JTAG interface consists of four basic elements:

••

•Test Access Port (TAP)

••

•TAP controller

••

•Instruction Register (IR)

••

•Data Register Port (DR)

The following sections provide a brief description of each element. For a

complete description refer to the IEEE Standard Test Access Port Specification

(IEEE Std. 1149.1-1990).

The Figure below shows the standard Boundary-Scan Architecture

Figure 31. Boundary Scan Architecture

TEST ACCESS PORT (TAP)

The Tap interface is a general-purpose port that provides access to the

internal of the processor. It consists of four input ports (TCLK, TMS, TDI, TRST)

and one output port (TDO).

THE TAP CONTROLLER

The Tap controller is a synchronous finite state machine that responds to

TMS and TCLK signals to generate clock and control signals to the Instruction

and Data Registers for capture and update of data.

COMMERCIAL AND INDUSTRIAL

TEMPERATURE RANGES

IDT72V51336/72V51346/72V51356 3.3V, MULTI-QUEUE FLOW-CONTROL DEVICES

(8 QUEUES) 36 BIT WIDE CONFIGURATION 589,824, 1,179,648 and 2,359,296 bits

Test-Logic

Reset

Run-Test/

Idle

Select-

DR-Scan

Select-

IR-Scan

111

Capture-IR

Capture-DR

Exit1-DR

Pause-DR

Exit2-DR

Update-DR

Exit1-IR

Exit2-IR

Update-IR

5936 drw35

Shift-DR

Shift-IR

Pause-IR

Input = TMS

Refer to the IEEE Standard Test Access Port Specification (IEEE Std.

1149.1) for the full state diagram.

All state transitions within the TAP controller occur at the rising edge of the

TCLK pulse. The TMS signal level (0 or 1) determines the state progression

that occurs on each TCLK rising edge. The TAP controller takes precedence

over the Queue and must be reset after power up of the device. See TRST

description for more details on TAP controller reset.

Test-Logic-Reset All test logic is disabled in this controller state enabling

the normal operation of the IC. The TAP controller state machine is designed

in such a way that, no matter what the initial state of the controller is, the Test-

Logic-Reset state can be entered by holding TMS at high and pulsing TCK five

times. This is the reason why the Test Reset (TRST) pin is optional.

Run-Test-Idle In this controller state, the test logic in the IC is active only if

certain instructions are present. For example, if an instruction activates the self

test, then it will be executed when the controller enters this state. The test logic

in the IC is idles otherwise.

Select-DR-Scan This is a controller state where the decision to enter the

Data Path or the Select-IR-Scan state is made.

Select-IR-Scan This is a controller state where the decision to enter the

Instruction Path is made. The Controller can return to the Test-Logic-Reset state

other wise.

Figure 32. TAP Controller State Diagram

Capture-IR In this controller state, the shift register bank in the Instruction

last two significant bits are always required to be “01”.

Shift-IR In this controller state, the instruction register gets connected

between TDI and TDO, and the captured pattern gets shifted on each rising edge

of TCK. The instruction available on the TDI pin is also shifted in to the instruction

Exit1-IR This is a controller state where a decision to enter either the Pause-

IR state or Update-IR state is made.

Pause-IR This state is provided in order to allow the shifting of instruction

Exit2-DR This is a controller state where a decision to enter either the Shift-

IR state or Update-IR state is made.

Update-IR In this controller state, the instruction in the instruction register is

latched in to the latch bank of the Instruction Register on every falling edge of

TCK. This instruction also becomes the current instruction once it is latched.

Capture-DR In this controller state, the data is parallel loaded in to the data

registers selected by the current instruction on the rising edge of TCK.

Shift-DR, Exit1-DR, Pause-DR, Exit2-DR and Update-DR These

controller states are similar to the Shift-IR, Exit1-IR, Pause-IR, Exit2-IR and

Update-IR states in the Instruction path.

NOTES:

1. Five consecutive TCK cycles with TMS = 1 will reset the TAP.

2. TAP controller does not automatically reset upon power-up. The user must provide a reset to the TAP controller (either by TRST or TMS).

3. TAP controller must be reset before normal Queue operations can begin.

IDT72V51336/72V51346/72V51356 3.3V, MULTI-QUEUE FLOW-CONTROL DEVICES

(8 QUEUES) 36 BIT WIDE CONFIGURATION 589,824, 1,179,648 and 2,359,296 bits

COMMERCIAL AND INDUSTRIAL

TEMPERATURE RANGES

THE INSTRUCTION REGISTER

The Instruction register allows an instruction to be shifted in serially into the

processor at the rising edge of TCLK.

The Instruction is used to select the test to be performed, or the test data

at the completion of the shifting process when the TAP controller is at Update-

IR state.

The instruction register must contain 4 bit instruction register-based cells

which can hold instruction data. These mandatory cells are located nearest the

serial outputs they are the least significant bits.

TEST DATA REGISTER

The Test Data register contains three test data registers: the Bypass, the

Boundary Scan register and Device ID register.

These registers are connected in parallel between a common serial input

and a common serial data output.

The following sections provide a brief description of each element. For a

complete description, refer to the IEEE Standard Test Access Port Specification

(IEEE Std. 1149.1-1990).

TEST BYPASS REGISTER

The register is used to allow test data to flow through the device from TDI

to TDO. It contains a single stage shift register for a minimum length in serial path.

When the bypass register is selected by an instruction, the shift register stage

is set to a logic zero on the rising edge of TCLK when the TAP controller is in

the Capture-DR state.

The operation of the bypass register should not have any effect on the

operation of the device in response to the BYPASS instruction.

THE BOUNDARY-SCAN REGISTER

The Boundary Scan Register allows serial data TDI be loaded in to or read

out of the processor input/output ports. The Boundary Scan Register is a part

of the IEEE 1149.1-1990 Standard JTAG Implementation.

THE DEVICE IDENTIFICATION REGISTER

The Device Identification Register is a Read Only 32-bit register used to

specify the manufacturer, part number and version of the processor to be

determined through the TAP in response to the IDCODE instruction.

IDT JEDEC ID number is 0xB3. This translates to 0x33 when the parity

is dropped in the 11-bit Manufacturer ID field.

For the IDT72V51336/72V51346/72V51356, the Part Number field con-

tains the following values:

Device Part# Field (HEX)

IDT72V51336 0x42B

IDT72V51346 0x42C

IDT72V51356 0x42D

JTAG INSTRUCTION REGISTER

The Instruction register allows instruction to be serially input into the device

when the TAP controller is in the Shift-IR state. The instruction is decoded to

perform the following:

••

•Select test data registers that may operate while the instruction is

current. The other test data registers should not interfere with chip

operation and the selected data register.

••

•Define the serial test data register path that is used to shift data between

TDI and TDO during data register scanning.

The Instruction Register is a 4 bit field (i.e. IR3, IR2, IR1, IR0) to decode

16 different possible instructions. Instructions are decoded as follows.

JTAG INSTRUCTION REGISTER DECODING

Hex Instruction Function

Value

00 EXTEST Select Boundary Scan Register

01 SAMPLE/PRELOAD Select Boundary Scan Register

02 IDCODE Select Chip Identification data register

04 HIGH-IMPEDANCE JTAG

0F BYPASS Select Bypass Register

The following sections provide a brief description of each instruction. For

a complete description refer to the IEEE Standard Test Access Port Specification

(IEEE Std. 1149.1-1990).

EXTEST

The required EXTEST instruction places the IC into an external boundary-

test mode and selects the boundary-scan register to be connected between TDI

and TDO. During this instruction, the boundary-scan register is accessed to

drive test data off-chip via the boundary outputs and receive test data off-chip

via the boundary inputs. As such, the EXTEST instruction is the workhorse of

IEEE. Std 1149.1, providing for probe-less testing of solder-joint opens/shorts

and of logic cluster function.

IDCODE

The optional IDCODE instruction allows the IC to remain in its functional mode

and selects the optional device identification register to be connected between

TDI and TDO. The device identification register is a 32-bit shift register

containing information regarding the IC manufacturer, device type, and version

code. Accessing the device identification register does not interfere with the

operation of the IC. Also, access to the device identification register should be

immediately available, via a TAP data-scan operation, after power-up of the

IC or after the TAP has been reset using the optional TRST pin or by otherwise

moving to the Test-Logic-Reset state.

SAMPLE/PRELOAD

The required SAMPLE/PRELOAD instruction allows the IC to remain in a

normal functional mode and selects the boundary-scan register to be connected

between TDI and TDO. During this instruction, the boundary-scan register can

be accessed via a date scan operation, to take a sample of the functional data

entering and leaving the IC. This instruction is also used to preload test data

into the boundary-scan register before loading an EXTEST instruction.

JTAG DEVICE IDENTIFICATION REGISTER

31(MSB) 28 27 12 11 1 0(LSB)

V ersion (4 bits) Part Number (16-bit) Manufacturer ID (1 1-bit)

0X0 0X33 1

COMMERCIAL AND INDUSTRIAL

TEMPERATURE RANGES

IDT72V51336/72V51346/72V51356 3.3V, MULTI-QUEUE FLOW-CONTROL DEVICES

(8 QUEUES) 36 BIT WIDE CONFIGURATION 589,824, 1,179,648 and 2,359,296 bits

HIGH-IMPEDANCE

The optional High-Impedance instruction sets all outputs (including two-state

as well as three-state types) of an IC to a disabled (high-impedance) state and

selects the one-bit bypass register to be connected between TDI and TDO.

During this instruction, data can be shifted through the bypass register from TDI

to TDO without affecting the condition of the IC outputs.

BYPASS

The required BYPASS instruction allows the IC to remain in a normal

functional mode and selects the one-bit bypass register to be connected

between TDI and TDO. The BYPASS instruction allows serial data to be

transferred through the IC from TDI to TDO without affecting the operation of

the IC.

IDT72V51336/72V51346/72V51356 3.3V, MULTI-QUEUE FLOW-CONTROL DEVICES

(8 QUEUES) 36 BIT WIDE CONFIGURATION 589,824, 1,179,648 and 2,359,296 bits

COMMERCIAL AND INDUSTRIAL

TEMPERATURE RANGES

TDO

TDI/

TMS

TCK

TRST

Notes to diagram:

t1 = t

TCKLOW

t2 = t

TCKHIGH

t3 = t

TCKFALL

t4 = t

TCKRISE

t5 = tRST

(reset pulse width)

t6 = tRSR (reset recovery)

5936 drw36

t1t2

TCK

Figure 33. Standard JTAG Timing

Parameter Symbol Test

Conditions Min. Max. Units

JTAG Clock Input Period tTCK - 100 - ns

JTAG Clock HIGH tTCKHIGH -40-ns

JTAG Clock Low tTCKLOW -40-ns

JTAG Clock Rise Time tTCKRISE --5

(1) ns

JTAG Clock Fall Time tTCKFALL --5

(1) ns

JTAG Reset tRST -50-ns

JTAG Reset Recovery tRSR -50-ns

JTAG

AC ELECTRICAL CHARACTERISTICS

(vcc = 3.3V ± 5%; Tcase = 0°C to +85°C)

NOTE:

1. 50pf loading on external output signals. NOTE:

1. Guaranteed by design.

SYSTEM INTERFACE PARAMETERS

IDT72V51336

IDT72V51346

IDT72V51356

Parameter Symbol Test Conditions Min. Max. Units

Data Output tDO(1) -20ns

Data Output Hold tDOH(1) 0-ns

Data Input tDS trise=3ns 10 - ns

tDH tfall=3ns 10 -

CORPORATE HEADQUARTERS for SALES: for Tech Support:

2975 Stender Way 800-345-7015 or 408-727-6116 408-330-1533

Santa Clara, CA 95054 fax: 408-492-8674 email: Flow-Controlhelp@idt.com

www.idt.com

ORDERING INFORMATION

NOTE:

1. Industrial temperature range product for the 7-5ns is available as a standard device. All other speed grades are available by special order.

Plastic Ball Grid Array (PBGA, BB256-1)

Commercial (0°C to +70°C)

lndustrial (-40°C to +85°C)

Low Power

5936 drw37

Commercial Only

Commercial & Industrial

IDT XXXXX

Device Type

Power

Speed

Package

Process /

Temperature

Range

BLANK

(1)

72V51336 589,824 bits  3.3V Multi-Queue Flow-Control Device

72V51346 1,179,648 bits  3.3V Multi-Queue Flow-Control Device

72V51356 2,359,296 bits  3.3V Multi-Queue Flow-Control Device

Clock Cycle Time (t

CLK

)

Speed in Nanoseconds

7-5

DATASHEET DOCUMENT HISTORY

10/10/2001 pgs. 1, 8, 11, 14, 15 and 28.

11/16/2001 pgs. 4, 11, 17, 22-26, 28-31, 33, 45 and 46.

12/19/2001 pgs. 12 and 29.

01/15/2002 pg. 50.

04/05/2002 pgs. 7, 8, 10, 11, 14, 47 and 52.

07/01/2002 pgs. 2 and 29.

06/04/2003 pgs. 1 through 57.