BU-61580S3300 - Data Device Corporation (DDC)

BU-65170/61580 and BU-61585

DESCRIPTION

DDC's BU-65170, BU-61580 and

BU-61585 Bus Controller / Remote

Terminal / Monitor Terminal

(BC/RT/MT) A d v anced

Communication Engine (ACE) termi-

nals comprise a complete integrated

interface between a host processor

and a MIL-STD-1553 A and B or

STANAG 3838 bus.

The ACE series is packaged in a 1.9 -

square-inch, 70-pin, low-profile,

cofired MultiChip Module (MCM)

ceramic package that is well suited for

applications with stringent height

requirements.

The BU-61585 ACE integrates dual

transceiver, protocol, memory man-

agement, processor interface logic,

and a total of 12K words of RAM in a

choice of DIP or flat pack packages.

The BU-61585 requires +5 V power

and either -15 V or -12 V power.

The BU-61585 internal RAM can be

configured as 12K x 16 or 8K x 17.

The 8K x 17 RAM feature provides

capability for memory integrity check-

ing by implementing RAM parity gen-

eration and verification on all access-

es. To minimize board space and

“glue” logic, the ACE provides ultimate

flexibility in interfacing to a host

processor and internal/external RAM.

The advanced functional architecture

of the ACE terminals provides soft-

ware compatibility to DDC's

Advanced Integ rated Multiple xer (AIM)

series hybrids, while incorporating a

multiplicity of architectural enhance-

ments. It allows flexible operation

while off-loading the host processor,

ensuring data sample consistency,

and suppor ts bulk data transfers.

The ACE hybrids may be operated at

either 12 or 16 MHz. Wire bond

options allow for programmable RT

address (hardwired is standard) and

external transmitter inhibit inputs.

MIL-STD-1553A/B NOTICE 2 RT and BC/RT/MT,

ADVANCED COMMUNICATION ENGINE (ACE)

FEATURES

•

Fully Integrated MIL-STD-1553

Interface T erminal

•

Flexible Processor/Memory

Interface

•

Standard 4K x 16 RAM and

Optional 12K x 16 or 8K x 17 RAM

Available

•

Optional RAM Parity

Generation/Checking

•

Automatic BC Retries

•

Programmable BC Gap Times

•

BC Frame Auto-Repeat

•

Flexible RT Data Buffering

•

Programmable Illegalization

•

Selective Message Monitor

•

Simultaneous RT/Monitor Mode

TRANSCEIVER

CH. A

TRANSCEIVER

CH. B

DUAL

ENCODER/DECODER,

MULTIPROTOCOL

AND

MEMORY

MANAGEMENT

RT ADDRESS

SHARED

RAM

ADDRESS BUS

PROCESSOR

AND

MEMORY

INTERFACE

LOGIC

DATA BUS D15-D0

A15-A0

DATA

BUFFERS

ADDRESS

BUFFERS

PROCESSOR

DATA BUS

PROCESSOR

ADDRESS BUS

MISCELLANEOUS

INCMD

CLK_IN, TAG_CLK,

MSTCLR,SSFLAG/EXT_TRG

RTAD4-RTAD0, RTADP

TRANSPARENT/BUFFERED, STRBD, SELECT,

RD/WR, MEM/REG, TRIGGER_SEL/MEMENA-IN,

MSB/LSB/DTGRT

IOEN, MEMENA-OUT, READYD

ADDR_LAT/MEMOE, ZERO_WAIT/MEMWR,

8/16-BIT/DTREQ, POLARITY_SEL/DTACK

INT

PROCESSOR

AND

MEMORY

CONTROL

INTERRUPT

REQUEST

TX/RX_A

TX/RX_B

* SEE ORDERING INFORMATION FOR AVAILABLE MEMORY

ACE User’s Guide

Also Available

FIGURE 1. ACE BLOCK DIAGRAM

Data Device Cor poration

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H1 web-09/02-0

TABLE 1. “ACE” SERIES SPECIFICATIONS

PARAMETER MIN TYP MAX UNITS

ABSOLUTE MAXIMUM RATING

Supply Voltage

!Logic +5V

!Transceiver +5V

!-15V

!-12V

Logic

!Voltage Input Range

-0.3

-18.0

-0.3

7.0

0.3

Vcc+0.3

RECEIVER

Differential Input Resistance

!(BU-65170/61580/61585X1,

BU-65170/61580/61585X2)

(Notes 1-7)

!(BU-65170/61580/61585X3,

BU-65170/61580/61585X6)

(Notes 1-7)

Differential Input Capacitance

!(BU-65170/61580/61585X1,

BU-65170/61580/61585X2)

(Notes 1-7)

!(BU-65170/61580/61585X3,

BU-65170/61580/61585X6)

(Notes 1-7)

Threshold Voltage, Transformer

Coupled, Measured on Stub

Common Mode Voltage (Note 7)

2.5

0.200

0.860

kΩ

Vp-p

Vpeak

-250

100

150

250

300

Vp-p

mVp-p,

diff

nsec

LOGIC

VIH

VIL

IIH (Vcc=5.5V, VIN=Vcc)

IIH (Vcc=5.5V, VIN=2.7V)

!SSFLAG/EXT_TRIG

!All Other Inputs

IIL (Vcc=5.5V, VIN=0.4V)

!SSFLAG/EXT_TRIG

!All Other Inputs

VOH (Vcc=4.5V, VIH=2.7V,

VIL=0.2V, IOH=max)

VOL (Vcc=4.5V, VIH=2.7V,

VIL=0.2V, IOL=max)

IOL

!DB15-DB0, A15-A0, MEMOE/

ADDR_LAT, MEMWR/

ZEROWAIT, DTREQ/16/8,

DTACK/POLARITY_SEL

2.0

-10

-692

-346

-794

-397

2.4

6.4

0.8

-84

-42

-100

-50

0.4

µA

5.5

-14.25

5.5

-11.4

5.5

5.25

190

108

160

255

190

120

185

305

200

350

500

800

240

108

160

255

4.5

-15.75

4.5

-12.6

4.5

4.75

POWER SUPPLY REQUIREMENTS

Voltages/Tolerances

!BU-65170/61580/61585X1

• +5V (Logic)

• +5V (Ch. A, Ch. B)

• -15V (Ch. A, Ch. B)

!BU-65170/61580/61585X2

• +5V (Logic)

• +5V (Ch. A, Ch. B)

• -12V (Ch. A, Ch. B)

!BU-65170/61580/61585X3,

BU-65170/61580/61585X6

• +5V (Logic)

• +5V (Ch. A, Ch. B)

Current Drain (Total Hybrid)

!BU-65170/61580X1

• +5V (Logic, Ch. A, Ch. B)

• -15V (Ch. A, Ch. B)

• Idle

• 25% Transmitter Duty Cycle

• 50% Transmitter Duty Cycle

• 100% Transmitter Duty Cycle

!BU-65170/61580X2

• +5V (Logic, Ch. A, Ch. B)

• -12V (Ch. A, Ch. B)

• Idle

• 25% Transmitter Duty Cycle

• 50% Transmitter Duty Cycle

• 100% Transmitter Duty Cycle

!BU-65170/61580X3,

BU-65170/61580X6

• +5V (Logic, Ch. A, Ch. B)

• Idle

• 25% Transmitter Duty Cycle

• 50% Transmitter Duty Cycle

• 100% Transmitter Duty Cycle

!BU-61585X1

• +5V (Logic, Ch. A, Ch. B)

• -15V (Ch. A, Ch. B)

• Idle

• 25% Transmitter Duty Cycle

• 50% Transmitter Duty Cycle

• 100% Transmitter Duty Cycle

-6.4

-3.2

3.2

UNITSMAXTYPMINPARAMETER

TABLE 1. “ACE” SERIES SPECIFICATIONS (CONTD)

TRANSMITTER

Differential Output Voltage

!Direct Coupled Across 35 Ω,

Measured on Bus

!Transformer Coupled Across

70 Ω, Measured on Bus

•(BU-65170/61580/61585X1)

•(BU-65170/61580/61585X2,X3, X6)

Output Noise, Differential (Direct

Coupled)

Output Offset Voltage, Transf ormer

Coupled Across 70 ohms

Rise/F all Time

LOGIC (cont’d)

!INCMD, INT MEMENA_OUT,

READYD, IOEN, TXA, TXA,

TXB, TXB, TX_INH_OUT_A,

TX_INH_OUT_B,

IOH

!DB15-DB0, A15-A0, MEMOE/

ADDR_LAT, MEMWR/

ZEROWAIT, DTREQ/16/8,

DTACK/POLARITY_SEL

!INCMD, INT, MEMENA_OUT,

READYD, IOEN, TXA, TXA,

TXB, TXB, TX_INH_OUT_A,

TX_INH_OUT_B,

CI(Input Capacitance)

CIO (Bi-directional signal input

capacitance)

5.0

-15.0

5.0

-12.0

5.0

105

180

130

230

245

360

590

105

180

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240

120

185

305

250

400

550

850

1.85

2.25

2.72

3.52

1.67

2.10

2.59

3.46

1.00

1.43

1.86

2.72

2.10

2.50

2.97

3.77

1.92

2.35

2.84

3.71

1.25

1.68

2.11

2.97

0.68

1.06

1.45

2.23

0.59

0.92

1.36

2.16

0.25

0.68

1.11

1.97

105

130

230

105

255

370

600

!BU-61585X2

• +5V (Logic, Ch. A, Ch. B)

• -12V (Ch. A, Ch. B)

• Idle

• 25% Transmitter Duty Cycle

• 50% Transmitter Duty Cycle

• 100% Transmitter Duty Cycle

!BU-61585X3,

BU-61585X6

• +5V (Logic, Ch. A, Ch. B)

• Idle

• 25% Transmitter Duty Cycle

• 50% Transmitter Duty Cycle

• 100% Transmitter Duty Cycle

POWER DISSIPATION

Total Hybrid

!BU-65170/61580X1

• Idle

• 25% Transmitter Duty Cycle

• 50% Transmitter Duty Cycle

• 100% Transmitter Duty Cycle

!BU-65170/61580X2

• Idle

• 25% Transmitter Duty Cycle

• 50% Transmitter Duty Cycle

• 100% Transmitter Duty Cycle

!BU-65170/61580X3,

BU-65170/61580X6

• Idle

• 25% Transmitter Duty Cycle

• 50% Transmitter Duty Cycle

• 100% Transmitter Duty Cycle

!BU-61585X1

• Idle

• 25% Transmitter Duty Cycle

• 50% Transmitter Duty Cycle

• 100% Transmitter Duty Cycle

!BU-61585X2

• Idle

• 25% Transmitter Duty Cycle

• 50% Transmitter Duty Cycle

• 100% Transmitter Duty Cycle

!BU-61585X3,

BU-61585X6

• Idle

• 25% Transmitter Duty Cycle

• 50% Transmitter Duty Cycle

• 100% Transmitter Duty Cycle

Hottest Die

!BU-65170/61580X1

• Idle

• 25% Transmitter Duty Cycle

• 50% Transmitter Duty Cycle

• 100% Transmitter Duty Cycle

!BU-65170/61580X2

• Idle

• 25% Transmitter Duty Cycle

• 50% Transmitter Duty Cycle

• 100% Transmitter Duty Cycle

!BU-65170/61580X3,

BU-65170/61580X6

• Idle

• 25% Transmitter Duty Cycle

• 50% Transmitter Duty Cycle

• 100% Transmitter Duty Cycle

UNITSMAXTYPMINPARAMETER

TABLE 1. “ACE” SERIES SPECIFICATIONS (CONTD)

oz (g)0.6 (17)

in.

(mm)

in.

(mm)

1.9 X 1.0 X 0.165

(48.3 x 25.4 x 4.19)

1.9 X 1.0 X 0.150

(48.3 x 25.4 x 3.81)

PHYSICAL CHARACTERISTICS

Size

!BU-65170/61580/61585 S

!BU-65170/61580/61585 V

Weight

!BU-65170/61580/61585 S/V

°C/W

°C

6.99

6.8

150

+300

-55

-65

THERMAL

Thermal Resistance, Junction-to-Case,

Hottest Die (θJC)

!BU-65170/61580/61585X1,

BU-65170/61580/61585X2,

!BU-65170/61580/61585X3,

BU-65170/61580/61585X6

Operating Junction Temperature

Storage Temperature

Lead Temperature (soldering, 10 sec.)

MHz

µs

0.01

0.1

0.001

0.01

19.5

23.5

51.5

131

16.0

12.0

2.5

9.5

18.5

22.5

50.5

129.5

668

17.5

21.5

49.5

127

CLOCK INPUT

Frequency

!Nominal Value (programmab le)

• Default Mode

• Software Programmable Option

!Long Term Tolerance

• 1553A Mode

• 1553B Mode

!Short Term Tolerance, 1 second

• 1553A Mode

• 1553B Mode

!Duty Cycle

• 16 MHz

• 12 MHz

1553 MESSAGE TIMING

Completion of CPU Wr ite (BC Star t)-

to-Star t of Next Message

BC Intermessage Gap (Note 8)

BC/RT/MT Response Timeout (Note 9)

!18.5 nominal

!22.5 nominal

!50.5 nominal

!128.0 nominal

RT Response Timeout (Note 11)

Transmitter W atchdog Timeout

UNITSMAXTYPMINPARAMETER

0.68

1.06

1.45

2.23

0.59

0.92

1.36

2.16

0.25

0.68

1.11

1.97

0.335

0.600

0.860

1.385

0.290

0.590

0.890

1.490

0.200

0.630

0.885

1.395

!BU-61585X1

• Idle

• 25% Transmitter Duty Cycle

• 50% Transmitter Duty Cycle

• 100% Transmitter Duty Cycle

!BU-61585X2

• Idle

• 25% Transmitter Duty Cycle

• 50% Transmitter Duty Cycle

• 100% Transmitter Duty Cycle

!BU-61585X3,

BU-61585X6

• Idle

• 25% Transmitter Duty Cycle

• 50% Transmitter Duty Cycle

• 100% Transmitter Duty Cycle

TABLE 1. “ACE” SERIES SPECIFICATIONS (CONTD)

0.850

1.195

1.450

1.975

0.835

1.135

1.435

2.035

0.475

0.905

1.160

1.670

0.900

1.245

1.500

2.025

0.885

1.185

1.485

2.085

0.525

0.955

1.210

1.720

0.335

0.600

0.860

1.385

0.290

0.590

0.890

1.490

0.200

0.630

0.885

1.395

Data Device Cor poration

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INTRODUCTION

DDC's ACE series of Integrated BC/RT/MT hybrids provide a

complete, flexible interface between a microprocessor and a

MIL-STD-1553A, B Notice 2, McAir, or STANAG 3838 bus,

implementing Bus Controller, Remote Terminal (RT) and Monitor

Terminal (MT) modes. Packaged in a single 1.9-square-inch,

70-pin DIP or surf ace mountable flatpack or J-lead package , the

ACE series contains dual low-power transceivers and

encoder/decoders, complete BC/RT/MT multi-protocol logic,

memor y management and interrupt logic, 4K x 16 of shared sta-

tic RAM and a direct, buffered interface to a host processor bus.

The BU-65170/61580 contains internal address latches and bidi-

rectional data buffers to provide a direct interface to a host

processor bus. The BU-65170/61580 may be interfaced directly

to both 16-bit and 8-bit microprocessors in a buffered shared

RAM configuration. In addition, the ACE may connect to a 16-bit

processor bus via a Direct Memory Access (DMA) interface.The

BU-65170/61580 includes 4K words of buffered RAM.

Alternatively, the ACE may be interfaced to as much as 64K

words of external RAM in either the shared RAM or DMA config-

urations.

The ACE RT mode is multiprotocol, supporting MIL-STD-1553A,

MIL-STD-1553B Notice 2, STANAG 3838 (including EFAbus),

and the McAir A3818, A5232, and A5690 protocols. Full compli-

ance to the McAir specs, however, requires the use of a sinu-

soidal transceiver (transceiver option 5). Refer to the BU-61590

data sheet for additional information on McAir ter minals.

The memory management scheme for RT mode provides an

option for separation of broadcast data, in compliance with

1553B Notice 2. Both double buffer and circular buffer options

are programmable by subaddress. These features serve to

ensure data consistency and to off-load the host processor for

bulk data transfer applications.

The ACE series implements three monitor modes: a word moni-

tor, a selective message monitor, and a combined RT/selective

monitor. Other features include options for automatic retries and

programmable inter message gap for BC mode, an internal Time

Tag Register , an Interrupt Status Register and internal command

illegalization for RT mode.

FUNCTIONAL OVERVIEW

TRANSCEIVERS

The transceivers in the BU-65170/61580X3(X6) are fully mono-

lithic, requiring only a +5 volt power input. Besides eliminating

the need f or an additional po w er supply, the use of a 5 v olt (only)

transceiver requires the use of step-up, rather than step-down,

isolation transformers. This provides the advantage of a higher

terminal input impedance than is possible for a 15 volt or 12 volt

transmitter. As a result, there is greater margin for the input

impedance test, mandated for 1553 validation testing. This

allows for longer cable lengths between an LRU's system con-

nector and the isolation transfor mers of an embedded 1553 ter-

minal.

For the +5 V and -15 V/-12 V front end, the BU-65170/

61580X1(X2) uses low-power bipolar analog monolithic and

thick-film hybrid technology. The transceiver requires +5 V and -

15 V (-12 V) only (requiring no +15 V/+12 V) and includes volt-

age source transmitters.The voltage source transmitters provide

superior line driving capability for long cables and heavy

amounts of bus loading. In addition, the monolithic transceivers

in the BU-65170/61580X1 provide a minimum stub voltage level

of 20 volts peak-to-peak transformer coupled, making them suit-

able for MIL-STD-1760 applications.

The receiver sections of the BU-65170/61580 are fully compliant

with MIL-STD-1553B in terms of front end overvoltage protec-

tion, threshold, common mode rejection, and word error rate. In

addition, the receiver filters ha v e been designed f or optimal oper-

ation with the J´ chip's Manchester II decoders.

J´ DIGITAL MONOLITHIC

The J´ digital monolithic represents the cornerstone element of

the ACE family of terminals.The development of the J´ chip rep-

resents the fifth generation of 1553 protocol and interf ace design

for DDC. Over the years, DDC's 1553 protocol and interface

design has e volv ed from:(1) discrete component sets , consisting

of multiple hybrids (with large numbers of chips inside the indi-

vidual hybrids) and programmable logic devices, to (2) multiple

custom ASICs to perform the functions of encoder/decoder and

RT protocol within a single hybrid, to (3) the BUS-61553

Advanced Integrated Mux Hybrid (AIM-HY) series, containing, in

addition to a dual monolithic/thick-film transceiver and discrete

RAM chips, a custom protocol chip and a separate custom mem-

ory management/processor interface chip, to (4) the BUS-61559

Advanced Integrated Mux Hybrids with Enhanced RT Features

(AIM-HY'er — the AIM-HY'er series includes memory manage-

ment and processor interf ace functions bey ond those of the AIM-

HY series) , to (5) the full integration of the J´ chip.

Notes for Table 1: Notes 1 through 6 are applicable to the Receiver

Differential Resistance and Differential Capacitance specifications:

(1) Specifications include both transmitter and receiver (tied together

internally).

(2) Measurement of impedance is directly between pins TX/RX A(B)

and TX/RX A(B) of the BU-65170/61580XX hybrid.

(3) Assuming the connection of all power and ground inputs to the

hybrid.

(4) The specifications are applicable for both unpowered and powered

conditions.

(5) The specifications assume a 2 volt rms balanced, differential, sinu-

soidal input.The applicable frequency range is 75 kHz to 1 MHz.

(6) Minimum resistance and maximum capacitance parameters are

guaranteed,but not tested, over the operating range.

(7) Assumes a common mode voltage within the frequency range of dc

to 2MHz, applied to pins of the isolation transfor mer on the stub

side (either direct or transfor mer coupled), referenced to hybrid

ground. Use a DDC recommended transformer or other transformer

that provides an equivalent minimum CMRR.

(8) Typical value for minimum intermessage gap time. Under software

control, may be lengthened to (65,535µs minus message time), in

increments of 1µs.

(9) Software programmable (4 options). Includes RT-to-RT Timeout

(Mid-Par ity of Transmit Command to Mid-Sync of Transmitting RT

Status).

(10) For both +5V logic and transceiver. +5V for channels A and B.

(11) Measured from mid-parity crossing of Command Word to mid-sync

crossing of RT's Status Word.

(12) Specifications for BU-65171, BU-61581, and BU-61586 are identi-

cal to the specifications for the BU-65170, BU-61580, and BU-

61585 respectively.

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The J´ chip consists of a dual encoder/decoder, complete proto-

col for Bus Controller (BC), 1553A/B/McAir Remote Terminal

(RT), and Monitor (MT) modes; memory management and inter-

rupt logic; a flexible, buffered interface to a host processor bus

and optional external RAM; and 4K words of on-chip RAM.

Ref erence the region within the dotted line of FIGURE 1.Besides

realizing all the protocol, memory management, and interface

functions of the earlier AIM-HY'er series, the J´ chip includes a

large number of enhancements to facilitate hardware and soft-

ware design, and to further off-load the 1553 terminal's host

processor.

DECODERS

The default mode of operation for the BU-65170 RT and BU-

61580 BC/RT/MT requires a 16 MHz clock input. If needed, a

software programmable option allows the device to be operated

from a 12 MHz clock input. Most current 1553 decoders sample

using a 10 MHz or 12 MHz clock. In the 16 MHz mode (default

following a hardware or software reset), the ACE decoders sam-

ple 1553 serial data using the 16 MHz clock. In the 12 MHz

mode, the decoders sample using both clock edges; this pro-

vides a sampling rate of 24 MHz. The faster sampling r ate f or the

J´ chip’s Manchester II decoders provides superior performance

in terms of bit error rate and zero-crossing distor tion tolerance.

F or interfacing to fiber optic tr ansceivers f or MIL-STD-1773 appli-

cations, a transceiverless version of the J´ chip, the BU-65620,

can be used. These versions provide a pin-prog rammab le option

for a direct interface to the single-ended outputs of a fiber optic

receiver. No exter nal logic is needed.

TIME T A GGING

The ACE includes an internal read/writable Time Tag Register.

This register is a CPU read/writable 16-bit counter with a pro-

grammable resolution of either 2, 4, 8, 16, 32, or 64 µs per LSB.

Also, the Time Tag Register may be clocked from an external

oscillator. Another option allows software-controlled increment-

ing of the Time Tag Register. This supports self-testing for the

Time Tag Register. For each message processed, the value of

the Time Tag register is loaded into the second location of the

respective descriptor stack entry (“TIME TAG WORD”) for both

BC and RT modes.

Additional provided options will: clear the Time Tag Register fol-

lowing a Synchronize (without data) mode command or load the

Time Tag Register following a Synchronize (with data) mode

command; enable an interrupt request and a bit setting in the

Interrupt Status Register when the Time Tag Register rolls over

from 0000 to FFFF. Assuming the Time Tag Register is not

loaded or reset, this will occur at approximately 4-second time

inter vals, for 64 µs/LSB resolution, down to 131 ms intervals, for

2 µs/LSB resolution.

Another programmable option for RT mode is the automatic

clearing of the Service Request Status Word bit following the

ACE's response to a Transmit Vector Word mode command.

INTERRUPTS

The ACE series components provide many programmable

options for interrupt generation and handling. The interrupt out-

put pin (INT) has three software programmable modes of oper-

ation: a pulse, a level output cleared under software control, or a

level output automatically cleared following a read of the

Interrupt Status Register.

Individual interrupts are enabled by the Interrupt Mask Register.

The host processor ma y easily determine the cause of the inter-

rupt by using the Interrupt Status Register. The Interrupt Status

The Interrupt Status Register may be updated in two w a ys.In the

standard interrupt handling mode, a particular bit in the Interrupt

Status Register will be updated only if the condition exists and

the corresponding bit in the Interrupt Mask Register is enabled.

In the enhanced interrupt handling mode, a par ticular bit in the

Interrupt Status Register will be updated if the condition exists

regardless of the contents of the corresponding Interrupt Mask

bit enables an interrupt for a particular condition.

ADDRESSING, INTERNAL REGISTERS, AND

MEMORY MANAGEMENT

The software interface of the BU-65170/61580 to the host

processor consists of 17 internal operational registers for normal

operation, an additional 8 test registers, plus 64K x 16 of shared

memory address space.The BU-65170/61580's 4K x 16 of inter-

nal RAM resides in this address space.Reference TABLE 2 and

24.

Definition of the address mapping and accessibility f or the ACE's

17 non-test registers, and the test registers, is as follows:

Interrupt Mask Register is used to enable and disab le interrupt

requests for various conditions.

Configuration Registers #1 and #2 are used to select the BU-

61580's mode of operation, and f or software control of R T Status

Word bits, Active Memor y Area, BC Stop-on-Error, RT Memory

Management mode selection, and control of the Time Tag oper-

ation.

Start/Reset Register is used for “command”type functions,

such as software reset, BC/MT Start, Interr upt Reset, Time Tag

Reset, and Time Tag Register Test. The Start/Reset Register

includes provisions for stopping the BC in its auto-repeat mode,

either at the end of the current message or at the end of the cur-

rent BC frame.

BC/RT Command Stac k Pointer Register allows the host CPU

to determine the pointer location for the current or most recent

message when the BU-61580 is in BC or RT modes.

BC Control Word/RT Subaddress Control Word Register:In

BC mode, it allo ws host access to the current, or most recent BC

Control Word.The BC Control Word contains bits that select the

active bus and message format, enable off-line self-test, mask-

ing of Status Word bits, enable retr ies and interrupts, and spec-

ify MIL-STD-1553A or -1553B error handling. In RT mode, this

Subaddress Control Word. The Subaddress Control Word is

used to select the memory management scheme and enable

interrupts for the current message. The read/write accessibility

can be used as an aid for testing the ACE.

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Time T ag Register maintains the value of a real-time clock.The resolu-

tion of this register is programmable from among 2, 4, 8, 16, 32, and 64

µs/LSB.The TAG_CLK input signal also ma y cause an e xternal oscillator

to clock the Time Tag Register. Start-of-Message (SOM) and End-of-

Message (EOM) sequences in BC, RT, and Message Monitor modes

cause a write of the current value of the Time Tag Register to the stack

area of RAM.

Interrupt Status Register mirrors the Interrupt Mask Register and con-

tains a Master Interrupt bit. It allows the host processor to determine the

cause of an interrupt request by means of a single READ operation.

Configuration Registers #3,#4,and #5 are used to enable many of the

BU-61580's advanced features. These include all the enhanced mode

features;that is, all the functionality beyond that of the previous generation

product, the BUS-61559 Advanced Integrated Mux Hybrid with Enhanced

RT Features (AIM-HY'er).For all three modes, use of the Enhanced Mode

enables the var ious read-only bits in Configuration Register #1. For BC

mode, the enhanced mode features include the expanded BC Control

Word and BC Block Status Word, additional Stop-On-Error and Stop-On-

Status Set functions, frame auto-repeat, programmable intermessage

gap times, automatic retries, expanded Status Word Masking, and the

capability to generate interrupts following the completion of any selected

message. For RT mode, the enhanced mode features include the

expanded RT Block Status Word, the combined RT/Selective Message

Monitor mode, internal wrapping of the R TFAIL output signal (from the J´

chip) to the RTFLAG RT Status Word bit, the double b uffering scheme for

individual receive (broadcast) subaddresses , and the alternate (fully soft-

ware programmable) RT Status Word. For MT mode, use of the

enhanced mode enables use of the Selective Message Monitor, the com-

bined R T/Selective Monitor modes , and the monitor triggering capability.

Data Stack Address Register is used to point to the current address

location in shared RAM used for storing message words (second

Command Words, Data Words, RT Status Words) in the Selectiv e Word

Monitor mode.

Frame Time Remaining Register provides a read only indication of the

time remaining in the current BC frame.The resolution of this register is

100 µs/LSB.

Message Time Remaining Register provides a read only indication of

the time remaining before the star t of the next message in a BC frame.

The resolution of this register is 1 µs/LSB.

BC Frame/RT Last Command/MT Trigger Word Register: In BC

mode, it programs the BC frame time, for use in the frame auto-repeat

mode.The resolution of this register is 100 µs/LSB, with a range of 6.55

seconds; in RT mode, this register stores the current (or most previous)

1553 Command Word processed by the ACE RT; in the Word Monitor

mode, this register specifies a 16-bit Trigger (Command) Word. The

Trigger Word may be used to start or stop the monitor, or to generate inter-

rupts.

Status Word Register and BIT Word Registers provide read-only indi-

cations of the BU-65170/61580's R T Status and BIT W ords .

T est Mode Register s 0-7:These registers ma y be used to f acilitate pro-

duction or maintenance testing of the BU-65170/61580 and systems

incorporating the BU-65170/61580.

TABLE 2. ADDRESS MAPPING

ADDRESS LINES REGISTER

DESCRIPTION/ACCESSIBILITY

HEX A4 A3 A2 A1 A0

00 0 0 0 0 0 Interrupt Mask Register (RD/WR)

01 0 0 0 0 1 Configuration Register #1 (RD/WR)

02 0 0 0 1 0 Configuration Register #2 (RD/WR)

03 0 0 0 1 1 Star t/Reset Register (WR)

03 0 0 0 1 1 BC/RT Command Stack Pointer Register

(RD)

04 0 0 1 0 0 BC Control Word*/RT Subaddress Control

Word Register (RD/WR)

05 0 0 1 0 1 Time Tag Register (RD/WR)

06 0 0 1 1 0 Interrupt Status Register (RD)

07 0 0 1 1 1 Configuration Register #3 (RD/WR)

08 0 1 0 0 0 Configuration Register #4 (RD/WR)

09 0 1 0 0 1 Configuration Register #5 (RD/WR)

0A 0 1 0 1 0 Data Stack Address Register (RD)*

0B 0 1 0 1 1 BC Frame Time Remaining Register (RD)*

0C 0 1 1 0 0 BC Time Remaining to Next Message

0D 0 1 1 0 1 BC Frame Time*/RT Last Command/MT

Trigger Word* Register (RD/WR)

0E 0 1 1 1 0 RT Status Word Register (RD)

0F 0 1 1 1 1 RT BIT Word Register (RD)

10 1 0 0 0 0 Test Mode Register 0

•

17 1 0 1 1 1 Test Mode Register 7

18 1 1 0 0 0 reserved

•

1F 1 1 1 1 1 reserved

*Not applicable to BU-65170/61571 TABLE 3. INTERRUPT MASK REGISTER (READ/WRITE 00h)

BIT DESCRIPTION

15(MSB) RESERVED

14 RAM PARITY ERROR

13 BC/RT TRANSMITTER TIMEOUT

12 BC/RT COMMAND STACK ROLLOVER

11 MT COMMAND STACK ROLLOVER

10 MT DATA STACK ROLLOVER

9HS FAIL

8BC RETRY

7RT ADDRESS PARITY ERROR

6TIME TAG ROLLOVER

5RT CIRCULAR BUFFER ROLLOVER

4BC CONTROL WORD/RT SUBADDRESS CONTROL WORD EOM

3BC END OF FRAME

2FORMAT ERROR

1BC STATUS SET/RT MODE CODE/MT PATTERN TRIGGER

0(LSB) END OF MESSAGE

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TABLE 4. CONFIGURATION REGISTER #1 (READ/WRITE 01H)

BIT BC FUNCTION (Bits

11-0 Enhanced Mode Only) RT WITHOUT AL TERNATE

STATUS RT WITH ALTERNA TE

STATUS (Enhanced Only) MONITOR FUNCTION

(Enhanced mode only bits 12-0)

(MSB) RT/BC-MT (logic 0) (logic 1) (logic 1) (logic 0)

14 MT/BC-RT (logic 0) (logic 0) (logic 0) (logic 1)

13 CURRENT AREA B/A CURRENT AREA B/A CURRENT AREA A/B CURRENT AREA B/A

12 MESSAGE STOP-ON-ERROR MESSAGE MONITOR ENABLED

(MMT) MESSAGE MONITOR

ENABLED (MMT) MESSAGE MONITOR ENABLED

(MMT)

11 FRAME STOP-ON-ERROR S10 TRIGGER ENABLED WORD

10 STATUS SET STOP-ON-MESSAGE BUSY S09 START-ON-TRIGGER

9STATUS SET STOP-ON-FRAME SERVICE REQUEST S08 STOP-ON-TRIGGER

8FRAME AUTO-REPEAT SUBSYSTEM FLAG S07 NOT USED

7EXTERNAL TRIGGER ENABLED RTFLAG (Enhanced Mode Only) S06 EXTERNAL TRIGGER ENABLED

6INTERNAL TRIGGER ENABLED NOT USED S05 NOT USED

5INTERMESSAGE GAP TIMER

ENABLED NOT USED S04 NOT USED

4RETRY ENABLED NOT USED S03 NOT USED

3DOUBLED/SINGLE RETRY NOT USED S02 NOT USED

2BC ENABLED (Read Only) NOT USED S01 MONITOR ENABLED(Read Only)

1BC FRAME IN PROGRESS (Read

Only) NOT USED S00 MONIT OR TRIGGERED

(Read Only)

(LSB) BC MESSAGE IN PROGRESS

(Read Only) RT MESSAGE IN PROGRESS

(Enhanced mode only,Read Only) RT MESSAGE IN PROGRESS

(Read Only) MONITOR ACTIVE

(Read Only)

SEPARATE BROADCAST DATA0(LSB) ENHANCED RT MEMORY MANAGEMENT1CLEAR SERVICE REQUEST2LEVEL/PULSE* INTERRUPT REQUEST3INTERRUPT STATUS AUTO CLEAR4LOAD TIME TAG ON SYNCHR ONIZE5CLEAR TIME TAG ON SYNCHRONIZE6TIME TAG RESOLUTION 0 (TTR0)7TIME TAG RESOLUTION 1 (TTR1)8TIME TAG RESOLUTION 2(TTR2)9256-WORD BOUNDARY DISABLE10 OVERWRITE INVALID DATA11 RX SA DOUBLE BUFFER ENABLE12 BUSY LOOKUP TABLE ENABLE13 RAM PARITY ENABLE (BU-61585/6 AND BU-65621 ONLY)

14 ENHANCED INTERRUPTS

15(MSB) DESCRIPTIONBIT

TABLE 5. CONFIGURATION REGISTER #2 (READ/WRITE 02h) TABLE 6. START/RESET REGISTER (WRITE 03H)

BIT DESCRIPTION

15(MSB) RESERVED

• •

7 RESERVED

6BC/MT STOP-ON-MESSAGE

5BC STOP-ON-FRAME

4TIME TAG TEST CLOCK

3TIME TAG RESET

2INTERRUPT RESET

1BC/MT START

0(LSB) RESET

DYNAMIC BUS CONTROL

ACCEPTANCE

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COMMAND STACK POINTER 00(LSB) •• •• •• COMMAND STACK POINTER 15

15(MSB) DESCRIPTIONBIT

TABLE 7. BC/RT COMMAND STACK POINTER REG. (READ 03H)

RT-RT FORMAT

BROADCAST FORMAT

MODE CODE FORMAT

1553A/B SELECT

0(LSB)

3EOM INTERRUPT ENABLE4MASK BROADCAST BIT5OFF LINE SELF TEST6BUS CHANNEL A/B7RETRY ENABLED8RESERVED BITS MASK9

SUBSYS FLAG BIT MASK

TERMINAL FLAG BIT MASK

SUBSYS BUSY BIT MASK12 SERVICE REQUEST BIT MASK13 M.E. MASK14 RESERVED

15(MSB) DESCRIPTIONBIT

BCST: MEMORY MANAGEMENT 0 (MM0)0(LSB) BCST: MEMORY MANAGEMENT 1 (MM1)1BCST:MEMORY MANAGEMENT 2 (MM2)2

TX: MEMORY MANAGEMENT 1 (MM1)

BCST: CIRC BUF INT3BCST: EOM INT4RX: MEMORY MANAGEMENT 0 (MM0)5RX: MEMORY MANAGEMENT 1 (MM1)6RX: MEMORY MANAGEMENT 2 (MM2)7RX: CIRC BUF INT8RX: EOM INT9TX: MEMORY MANAGEMENT 0 (MM0)10

TX: MEMORY MANAGEMENT 2 (MM2)12 TX: CIRC BUF INT13 TX: EOM INT14 RX: DOUBLE BUFFER ENABLE

15(MSB) DESCRIPTIONBIT

TABLE 9. RT SUBADDRESS CONTROL WORD

(READ/WRITE 04H)

TIME TAG 00(LSB) •• •• •• TIME TAG 15

15(MSB) DESCRIPTIONBIT TABLE 10. TIME TAG REGISTER (READ/WRITE 05H)

END OF MESSAGE0(LSB)

BC STATUS SET/RT MODE CODE/MT PATTERN

TRIGGER

FORMAT ERROR2

MT COMMAND STACK ROLLOVER

BC END OF FRAME3BC CONTROL WORD/RT SUBADDRESS CONTROL WORD EOM

4RT CIRCULAR BUFFER ROLLOVER5TIME TAG ROLLOVER6RT ADDRESS PARITY ERROR7BC RETRY8HS FAIL9MT DATA STACK ROLLOVER10

BC/RT COMMAND STACK ROLLOVER12 BC/RT TRANSMITTER TIMEOUT13 RAM PARITY ERROR14 MASTER INTERRUPT

15(MSB) DESCRIPTIONBIT

TABLE 11. INTERRUPT STATUS REGISTER (READ 06H)

ENHANCED MODE CODE HANDLING0(LSB) 1553A MODE CODES ENABLE1RTFAIL-FLAG WRAP ENABLE2

MT COMMAND STACK SIZE 0

BUSY RX TRANSFER DISABLE3ILLEGAL RX TRANSFER DISABLE4ALTERNATE STATUS WORD ENABLE5OVERRIDE MODE T/R ERROR6ILLEGALIZATION DISABLED7MT DATA STACK SIZE 08MT DATA STACK SIZE 19MT DATA STACK SIZE 210

MT COMMAND STACK SIZE 112 BC/RT COMMAND STACK SIZE 013 BC/RT COMMAND STACK SIZE 114 ENHANCED MODE ENABLE

15(MSB) DESCRIPTIONBIT

TABLE 12. CONFIGURATION REGISTER #3 (READ/WRITE 07H)

TABLE 8. BC CONTROL WORD REGISTER

READ/WRITE 04H, (BU-61580 ONLY)

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TEST MODE 00(LSB)

TEST MODE 11

TEST MODE 22

BROADCAST MASK ENABLE/XOR

LATCH RT ADDRESS WITH CONFIG #53

MT TAG GAP OPTION4

VALID BUSY/NO DATA5

VALID M.E./NO DATA6

2ND RETRY ALT/SAME BUS7

1ST RETRY ALT/SAME BUS8

RETRY IF STATUS SET9

RETRY IF -A AND M.E.10

EXPANDED BC CONTROL WORD ENABLE12

MODE COMMAND OVERRIDE BUSY13

INHIBIT BIT WORD IF BUSY14

EXTERNAL BIT WORD ENABLE

15(MSB)

DESCRIPTIONBIT

TABLE 13. CONFIGURATION REGISTER #4 (READ/WRITE 08H)

RT ADDRESS PARITY0(LSB)

RT ADDRESS 01

RT ADDRESS 12

EXPANDED CROSSING ENABLED

RT ADDRESS 23

RT ADDRESS 34

RT ADDRESS 45

RT ADDRESS LATCH/TRANSPARENT (see NOTE)6

BROADCAST DISABLED7

GAP CHECK ENABLED8

RESPONSE TIMEOUT SELECT 09

RESPONSE TIMEOUT SELECT 110

EXTERNAL TX INHIBIT B, read only BU-65170/61580X612

EXTERNAL TX INHIBIT A, read only BU-65170/61580X613

LOGIC “0”14

12MHZ CLOCK SELECT

15(MSB)

DESCRIPTIONBIT

TABLE 14. CONFIGURATION REGISTER #5 (READ/WRITE 09H)

Notes for TABLE 14: Read only, logic “0” for 65170/61580, logic “1” for

65171/61581/61586.

MONITOR DATA STACK ADDRESS 0

0(LSB) •• •• •• MONITOR DATA STACK ADDRESS 15

15(MSB) DESCRIPTIONBIT

TABLE 15. MONITOR DATA STACK ADDRESS REGISTER

(READ/WRITE 0AH)

BC FRAME TIME REMAINING 00(LSB)

••

BC FRAME TIME REMAINING 15

15(MSB)

DESCRIPTIONBIT

TABLE 16. BC FRAME TIME REMAINING REGISTER

(READ/WRITE 0BH)

Note: resolution = 1 µs per LSB

BC MESSAGE TIME REMAINING 0

0(LSB)

••

BC MESSAGE TIME REMAINING 15

15(MSB)

DESCRIPTIONBIT

TABLE 17. BC MESSAGE TIME REMAINING REGISTER

(READ/WRITE 0CH)

Note: resolution = 1 µs per LSB

BIT 0

0(LSB)

••

BIT 15

15(MSB)

DESCRIPTIONBIT

TABLE 18. BC FRAME TIME/RT LAST COMMAND/T TRIGGER

TABLE 19. RT STATUS WORD REGISTER (READ/WRITE 0EH)

BIT DESCRIPTION

15(MSB) LOGIC “0”

12 LOGIC “0”

14 LOGIC “0”

13 LOGIC “0”

10 MESSAGE ERROR

9INSTRUMENTATION

8SERVICE REQUEST

7 RESERVED

6 RESERVED

5 RESERVED

4BROADCAST COMMAND RECEIVED

3 BUSY

LOGIC “0”

2SUBSYSTEM FLAG

1DYNAMIC BUS CONTROL ACCEPT

0(LSB) TERMINAL FLAG

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COMMAND WORD CONTENTS ERROR0(LSB) RT-RT 2ND COMMAND WORD ERROR1RT-RT NO RESPONSE ERROR2

TRANSMITTER SHUTDOWN B

RT-RT GAP/SYNCH/ADDRESS ERROR3PARITY/MANCHESTER ERROR RECEIVED4INCORRECT SYNC RECEIVED5LOW W ORD COUNT6HIGH WORD COUNT7CHANNEL B/A8TERMINAL FLAG INHIBITED9TRANSMITTER SHUTDOWN A10

HANDSHAKE FAILURE12 LOOP TEST FAILURE A13 LOOP TEST FAILURE B14 TRANSMITTER TIMEOUT

15(MSB) DESCRIPTIONBIT

TABLE 20. RT BIT WORD REGISTER (READ 0FH)

INVALID WORD0(LSB) INCORRECT SYNC TYPE1WORD COUNT ERROR2

STATUS SET

WRONG STATUS ADDRESS/NO GAP3GOOD DATA BLOCK TRANSFER4RETRY COUNT 05RETRY COUNT 16MASKED STATUS SET7LOOP TEST FAIL8NO RESPONSE TIMEOUT9FORMAT ERROR 10

ERROR FLAG12 CHANNEL B/A13 SOM14 EOM

15(MSB) DESCRIPTIONBIT

TABLE 21. BC MODE BLOCK STATUS WORD

NOTE:

TABLES 21 TO 24 ARE NOT REGISTERS, BUT

THEY ARE WORDS STORED IN RAM.

COMMAND WORD CONTENTS ERROR

0(LSB) RT-RT 2ND COMMAND ERROR1RT-RT GAP/SYNC/ADDRESS ERROR2

RT-RT FORMAT

INVALID WORD3INCORRECT SYNC4WORD COUNT ERROR5ILLEGAL COMMAND WORD6DATA STACK ROLLOVER7LOOP TEST FAIL8NO RESPONSE TIMEOUT9FORMAT ERROR 10

ERROR FLAG12 CHANNEL B/A13 SOM14 EOM

15(MSB) DESCRIPTIONBIT

TABLE 22. RT MODE BLOCK STATUS WORD

GAP TIME

MODE CODE0(LSB) CONTIGUOUS DATA/GAP1CHANNEL B/A2COMMAND/DATA3ERROR4BROADCAST5THIS RT6WORD FLAG7

•• •• •• GAP TIME15(MSB) DESCRIPTIONBIT

TABLE 23. WORD MONITOR IDENTIFICATION WORD

COMMAND WORD CONTENTS ERROR0(LSB) RT-RT 2ND COMMAND ERROR1RT-RT GAP/SYNC/ADDRESS ERROR2

RT-RT TRANSFER

INVALID WORD3INCORRECT SYNC4WORD COUNT ERROR5RESERVED6 DATA STACK ROLLOVER7GOOD DATA BLOCK TRANSFER8NO RESPONSE TIMEOUT9FORMAT ERROR 10

ERROR FLAG12 CHANNEL B/A13 SOM14 EOM

15(MSB) DESCRIPTIONBIT

TABLE 24. MESSAGE MONITOR MODE BLOCK STATUS WORD

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BUS CONTROLLER (BC) ARCHITECTURE

The BC protocol of the BU-61580 implements all MIL-STD-

1553B message f o rmats.Message format is programmable on a

message-by-message basis by means of bits in the BC Control

Word and the T/R bit of the Command Word for the respective

message. The BC Control Word allows 1553 message format,

1553A/B type RT, bus channel, self-test, and Status Word mask-

ing to be specified on an individual message basis. In addition,

automatic retries and/or interrupt requests may be enabled or

disabled for individual messages. The BC performs all error

checking required b y MIL-STD-1553B .This includes v alidation of

response time, sync type and sync encoding, Manchester II

encoding, parity, bit count, word count, Status Word RT Address

field, and various RT-to-RT transfer errors. The BU-61580's BC

response timeout value is programmable with choices of 18, 22,

50, and 130 µs. The longer response timeout values enable

operation over long buses and/or the use of repeaters.

FIGURE 2 illustrates BC intermessage gap and frame timing.

The BU-61580 may be programmed to process BC frames of up

to 512 messages with no processor inter vention. It is possible to

program for either single frame or frame auto-repeat operation.

In the auto-repeat mode, the frame repetition rate may be con-

trolled either internally, using a programmable BC fr ame timer, or

from an external trigger input.The internal BC frame time is pro-

grammable up to 6.55 seconds in increments of 100 µs. In addi-

tion to BC frame time, intermessage gap time, measured from

the start of the current message to the start of the subsequent

message, is programmable on an individual message basis.The

time between individual successive messages is programmable

up to 65.5 ms, in increments of 1 µs.

BC MEMORY ORGANIZATION

TABLE 25 illustrates a typical memory map for BC mode. It is

impor tant to note that the only fixed locations for the BU-61580

in the Standard BC mode are f or the two Stac k P ointers (address

locations 0100 (hex) and 0104) and for the two Message Count

locations (0101 and 0105). Enabling the Frame Auto-Repeat

mode will reserve four more memory locations for use in the

Enhanced BC mode; these locations are for the two Initial Stack

Pointers (address locations 102 (hex) and 106) and for the Initial

Message Count locations (103 and 107). The user is free to

locate the Stack and BC Message Blocks anywhere else within

the 64K (4K internal) shared RAM address space.

For simplicity of illustration, assume the allocation of the maxi-

mum length of a BC message f or each message b loc k in the typ-

ical BC memory map of TABLE 25. The maximum size of a BC

message block is 38 words, for an RT-to-RT transfer of 32 Data

Words (Control + 2 Commands + Loopback + 2 Status Words +

32 Data Words). Note, however, that this example assumes the

disabling of the 256-word boundaries.

MESSAGE NO. 1 MESSAGE NO. 2 MESSAGE NO. 1

MESSAGE

GAP TIME

FOR MESSAGE NO. 1

BC FRAME TIME

INTERMESSAGE GAP TIME

Stack B

Not Used

Message Block 93

0F00-0FFF

0EFC-0EFF

0ED6-0EFB

••

Initial Message Count A (see note)

(Auto-Frame Repeat Mode)

••

Message Block 20154-0179

Message Block 1012E-0153

Message Block 00108-012D

Initial Message Count B (see note)

(Auto-Frame Repeat Mode)

0107

Initial Stack Pointer B (see note)

(Auto-Frame Repeat Mode)

0106

Message Count B0105

Stack Pointer B0104

Initial Stack Pointer A (see note) (Auto-Frame Repeat

Mode)

0102

Message Count A (fixed location)0101

Stack Pointer A (fixed location)

Stack A

DESCRIPTION

ADDRESS

(HEX)

0103

FIGURE 2. BC MESSAGE GAP AND FRAME TIMING

Note: Used only in the Enhanced BC mode with Frame Auto-Repeat enabled.

0000-00FF

TABLE 25. TYPICAL BC MEMORY ORGANIZATION

(SHOWN FOR 4K RAM)

0100

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BC MEMORY MANAGEMENT

FIGURE 3 illustrates the BU-61580's BC memory management

scheme. One of the BC memory management features is the

global double buffering mechanism.This provides for two sets of

the various BC mode data structures: Stack Pointer and

Message Counter locations, Descriptor Stack areas, and BC

message blocks. Bit 13 of Configuration Register #1 selects the

current active area.At any point in time, the BU-61580's internal

1553 memory management logic may access only the various

data structures within the “active”area. FIGURE 3 delineates the

“active”and “inactive”areas by the nonshaded and shaded

areas, respectively; however, at any point in time, both the

“active” and “nonactive” areas are accessible by the host

processor. In most applications, the host processor will access

the “nonactive”area, while the 1553 bus processes the “active”

area messages.

The BC ma y be programmed to transmit m ultimessage frames of

up to 512 messages.The number of messages to be processed

is programmable by the Active Area Message Count location in

the shared RAM, initialized b y the host processor .In addition, the

host processor must initialize another location, the Active Area

Stack Pointer. The Stack Pointer references the four-word mes-

sage block descr iptor in the Stack area of shared RAM for each

message to be processed. The BC Stack size is programmable

with choices of 256, 512, 1024, and 2048 words.

In the BC F r ame A uto-Repeat mode , the Initial Stac k Pointer and

Initial Message Counter locations must be loaded by the host

prior to the processing of the first frame.The single frame mode

does not use these two locations.

The third and fourth words of the BC block descriptor are the

Intermessage Gap Time and the Message Block Address for the

respective message. These two memory locations must be wr it-

ten by the host processor prior to the star t of message process-

ing. Use of the Intermessage Gap Time is optional. The Block

Address pointer specifies the starting location for each message

bloc k.The first word of each BC message b loc k is the BC Control

Word.

At the start and end of each message, the Block Status and Time

Tag Words write to the message block descriptor in the stack.

The Block Status Word includes indications of message in

process or message completion, bus channel, status set,

response timeout, retry count, status address mismatch, loop

test (on-line self-test) failure, and other error conditions. TABLE

21 illustrates the bit mapping of the BC Block Status word. The

16-bit Time Tag Word will reflect the current contents of the inter-

nal Time Tag Register. This read/writable register, which oper-

ates for all three modes, has programmable resolution of from 2

to 64 µs/LSB. In addition, the Time Tag register may be clocked

from an external source.

BC MESSAGE BLOCK FORMATS AND BC CONTROL

WORD

In BC mode, the BU-61580 supports all MIL-STD-1553 message

formats. For each 1553 message format, the BU-61580 man-

dates a specific sequence of words within the BC Message

15 13 0

CURRENT

AREA B/A

CONFIGURATION

INITIAL STACK

POINTERS (NOTE)

INITIAL MESSAGE

COUNTERS (NOTE)

MESSAGE

COUNTERS

STACK

POINTERS

BLOCK STATUS WORD

TIME TAG WORD

MESSAGE

GAP TIME WORD

MESSAGE

BLOCK ADDR

DESCRIPTOR

STACKS

MESSAGE

BLOCKS

MESSAGE

BLOCK

MESSAGE

BLOCK

NOTE:

INITIAL STACK POINTERS AND INITIAL

MESSAGE COUNTERS USED ONLY IN

BC FRAME AUTO-REPEAT MODE.

FIGURE 3. BC MODE MEMORY MANAGEMENT

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Block. This includes locations for the Control, Command and

(transmitted) Data Words that are to be read from RAM by the

BC protocol logic. In addition, subsequent contiguous locations

must be allocated for storage of received Loopback, RT Status

and Data W ords .FIGURE 4 illustr ates the organization of the BC

message blocks for the various MIL-STD-1553 message for-

mats. Note that for all of the message formats, the BC Control

Word is located in the first location of the message block.

For each of the BC Message Block for mats, the first word in the

block is the BC Control Word.The BC Control Word is not trans-

mitted on the 1553 bus. Instead, it contains bits that select the

active bus and message format; enable off-line self-test; mask-

ing of Status Word bits; enable retries and interr upts; and speci-

fies MIL-STD-1553A or -1553B error handling. The bit mapping

and definitions of the BC Control Word are illustrated in

TABLE 8.

The BC Control Word is followed by the Command Word to be

transmitted, and subsequently by a second Command Word (for

an RT-to-RT transfer), followed by Data Words to be transmitted

(for Receive commands). The location after the last word to be

transmitted is reserved for the Loopback Word. The Loopback

Word is an on-line self-test feature. The subsequent locations

after the Loopback W ord are reserved for received Status Words

and Data Words (for Transmit commands).

AUTOMATIC RETRIES

The BU-61580 BC implements automatic message retries.When

enabled, retries will occur, following response timeout or format

error conditions. As additional options, retries may be enabled

when the Message Error Status Word bit is set by a 1553A R T or

following a ”Status Set”condition. For a failed message, either

one or two message retries will occur, the bus channel (same or

alternate) is independently programmable for the first and sec-

ond retry attempts. Retries may be enabled or disabled on an

individual message basis.

BC INTERRUPTS

BC interrupts may be enabled by the Interrupt Mask Register for

Stack Rollover, Retry, End-of-Message (global), End-of-

Message (in conjunction with the BC Control Word for individual

messages), response timeout, message error, end of BC frame,

and Status Set conditions. The definition of “Status Set”is pro-

grammable on an individual message basis, by means of the BC

Control Word. This allows for masking (“care/don't care”) of the

individual RT Status Word bits.

REMOTE TERMINAL (RT) ARCHITECTURE

The RT protocol design of the BU-65170/61580 represents

DDC's fifth generation implementation of a 1553 RT. One of the

salient features of the ACE's RT architecture is its true multipro-

tocol functionality. This includes programmable options for sup-

port of MIL-STD-1553A, the various McAir protocols, and MIL-

STD-1553B Notice 2.The BU-65170/61580 RT response time is

2 to 5 µs dead time (4 to 7 µs per 1553B), providing compliance

to all the 1553 protocols. Additional multiprotocol features of the

BU-65170/61580 include options for full software control of RT

Status and Built-in-Test (BIT) words. Alternatively, for 1553B

applications, these words may be formulated in real time by the

BU-65170/61580 protocol logic.

The BU-65170/61580 RT protocol design implements all the

MIL-STD-1553B message formats and dual redundant mode

codes.This design is based largely on pre vious gener ation prod-

ucts that have passed SEAFAC testing f or MIL-STD-1553B com-

pliance. The ACE RT performs comprehensive error checking,

word and format validation, and checks for various RT-to-RT

transfer errors. Other key features of the BU-65170/61580 RT

BC-to-RT T ransfer

Control Word

Receive Command Word

Data Word #1

Data Word #2

Last Data Word

Last Data Word Looped Back

Status Received Last Data Word

Data Word #2

Data Word #1

Status Received

Transmit Command Looped Back

Transmit Command Word

Control Word

RT-to-BC T ransfer

Transmit Command

Looped Back

Rx RT Status Word

Last Data

Data #2

Data #1

Tx RT Status Word

Transmit Command

Receive Command

Control Word

RT-to-RT T ransfer

Mode Command

Looped Back

Status Received

Mode Command

Control Word

Mode Code;

No Data

Mode Command

Looped Back

Data Word

Status Received

Tx Mode Command

Control Word

Tx Mode Code;

With Data

Tx Command

Looped Back

Last Data

Data #2

Data #1

Tx RT Status Word

Tx Command

Rx Broadcast Command

Control Word

RT-to-RTs (Broadcast)

Transfer

Last Data Status

Word

Last Data

Data #2

Data #1

Broadcast Command

Control Word

Broadcast

Data Word

Data Word Looped

Back

Status Received

Rx Mode Command

Control Word

Rx Mode Code;

With Data

Broadcast Mode Command

Looped Back

Broadcast Mode Command

Control Word

Broadcast Mode Code;

No Data

Data Word Looped Back

Data Word

Broadcast Mode Command

Control Word

Broadcast Mode Code;

With Data

FIGURE 4. BC MESSAGE BLOCK FORMATS

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include a set of interrupt conditions, internal command illegaliza-

tion, and programmable busy by subaddress.

RT MEMORY ORGANIZATION

TABLE 26 illustrates a typical memory map for the BU-61580 in

RT mode. As in BC mode, the two Stack Pointers reside in fixed

locations in the shared RAM address space: address 0100 (hex)

for the Area A Stack Pointer and address 0104 for the Area B

Stack Pointer. Besides the Stack Pointer, for RT mode there are

several other areas of the ACE address space designated as

fix ed locations.All R T modes of oper ation require the Area A and

Area B Lookup Tables. Also allocated are several fixed locations

for optional features: Command Illegalization Lookup Table,

Mode Code Selective Interrupt Table, Mode Code Data Table,

and Busy Bit Lookup Table. It should be noted that any unen-

abled optional fixed locations may be used for general purpose

storage (data blocks).

The RT Lookup tables, which provide a mechanism for mapping

data blocks for individual Tx/Rx/Bcst-subaddresses to areas in

the RAM, occupy address range locations are 0140 to 01BF for

Area A and 01C0 to 023F for Area B. The RT lookup tables

include Subaddress Control Words and the individual Data Block

Pointers. If used, address range 0300-03FF will be dedicated as

the illegalizing section of RAM.The actual Stack RAM area and

the individual data blocks may be located in any of the nonfixed

areas in the shared RAM address space.

RT MEMORY MANAGEMENT

One of the salient f eatures of the A CE series products is the flex-

ibility of its RT memor y management architecture.The RT archi-

tecture allows the memory management scheme for each trans-

mit, receive, or broadcast subaddress to be programmable on a

subaddress basis. Also, in compliance with MIL-STD-1553B

Notice 2, the BU-65170/61580 provides an option to separate

data received from broadcast messages from nonbroadcast

received data.

Besides suppor ting a global double buffering scheme (as in BC

mode), the ACE RT provides a pair of 128-word Lookup Tables

for memor y management control. They are programmable on a

subaddress basis (refer to TABLE 27). These 128-word tables

include 32-word tables for transmit message pointers and

receive message pointers.There is also a third, optional Lookup

Table for broadcast message pointers, providing Notice 2 com-

pliance, if necessary.

The f ourth section of each of the RT Lookup Tables stores the 32

Subaddress Control Words (refer to TABLE 9 and 28). The indi-

vidual Subaddress Control Words may be used to select the RT

memory management option and interrupt scheme for each

transmit, receive, and (optionally) broadcast subaddress.

For each transmit subaddress, there are two possible memory

management schemes: (1) single message; and (2) circular

buffer. For each receive (and optionally broadcast) subaddress,

there are three possible memory management schemes: (1) sin-

gle message; (2) double buffered; and (3) circular buffer. For

each transmit, receive and broadcast subaddress, there are two

interrupt conditions that are programmable by the respective

Subaddress Control Word: (1) after every message to the sub-

Data Block 100

•

0FE0-0FFF

•

••

·•Data Block 60420-043F Data Block 50400-041F Command Illegalizing Table (fixed area)0300-03FF

RESERVED

Data Block 1-40280-02FF Data Block 00260-027F (not used)0248-025F Busy Bit Lookup Table (fixed area)0240-0247 Lookup Table B (fixed area)01C0-023F Lookup Table A (fixed area)0140-01BF Mode Code Data (fixed area)0110-013F Mode Code Selective Interrupt Table (fixed area)0108-010F

Stack Pointer B (fixed location)0104 RESERVED0101-0103 Stack Pointer A (fixed location)0100 Stack A0000-00FF

DESCRIPTION

ADDRESS

(HEX)

0105-0107

TABLE 26. TYPICAL RT MEMORY MAP (SHOWN FOR 4K RAM)

TABLE 27. LOOK-UP TABLES

AREA A AREA B DESCRIPTION COMMENT

01C0

01DF

Rx(/Bcst)_SA0

Rx(/Bcst)_SA31

Receive

(/Broadcast)

Lookup Table

01E0

01FF

Tx_SA0

Tx_SA31

Transmit

Lookup Table

0200

021F

Bcst_SA0

Bcst_SA31

Broadcast

Lookup Table

Optional

0220

023F

SACW_SA0

SACW_SA31

Subaddress

Control Word

Lookup Table

(Optional)

0140

015F

0160

017F

0180

019F

01A0

01BF

MM2 MM1 MM0 COMMENT

0 0 0 Single Message or Double Buffered

0 0 1 128-Word

0 1 0 256-Word

0 1 1 512-Word

8192-Word

4096-Word

2048-Word

1024-Word

Circular Buffer of

Specified Size

DESCRIPTION

TABLE 28. SUBADDRESS CONTROL WORD

Memory Management Subaddress Buffer Scheme

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address; (2) after a circular buffer rollover. An additional table in

RAM may be used to enable interrupts following selected mode

code messages.

When using the circular buffer scheme for a given subaddress,

the size of the circular b uff er is progr ammab le by three bits of the

Subaddress Control Word (see TABLE 28). The options for cir-

cular buffer size are 128, 256, 512, 1024, 2048, 4096, and 8192

Data W ords .

SINGLE MESSAGE MODE

FIGURE 5 illustrates the RT Single Message memor y manage-

ment scheme.When operating the BU-65170/61580 in its “AIM-

HY”(def ault) mode , the Single Message scheme is implemented

for all transmit, receive, and broadcast subaddresses. In the

Single Message mode (also in the Double Buffer and Circular

Buffer modes), there is a global double buffering scheme, con-

trolled by bit 13 of Configuration Register #1. This selects from

between the two sets of the various data structures shown in the

figure: the Stack Pointers (fixed addresses), Descriptor Stacks

(user defined addresses), RT Lookup Tables (fixed addresses),

and R T Data Word b loc ks (user defined addresses).FIGURES 5,

6, and 7 delineate the “active”and “nonactive”areas by the non-

shaded and shaded areas, respectively.

As shown, the ACE stores the Command Word from each mes-

sage received, in the fourth location within the message descrip-

tor (in the stack) for the respective message.The T/R bit, subad-

dress field, and (optionally) broadcast/own address, index into

the active area Lookup Table, to locate the data block pointer for

the current message. The BU-65170/61580 RT memory man-

agement logic then accesses the data block pointer to locate the

starting address for the Data Word block for the current mes-

sage.The maximum size for an RT Data Word block is 32 words.

For a par ticular subaddress in the Single Message mode, there

is ov erwriting of the contents of the data blocks f or receiv e/broad-

cast subaddresses — or ov erreading, f or transmit subaddresses .

In the single message mode, it is possible to access multiple

data bloc ks f or the same subaddress .This, ho we v er, requires the

intervention of the host processor to update the respective

Lookup Table pointer .

To implement a data wraparound subaddress, as required by

Notice 2 of MIL-STD-1553B, the Single Message scheme should

be used for the wraparound subaddress. Notice 2 recommends

subaddress 30 as the wraparound subaddress.

CIRCULAR BUFFER MODE

FIGURE 6 illustrates the R T circular buff er memory management

scheme. The circular buffer mode facilitates bulk data transfers.

The size of the RT circular buffer, shown on the r ight side of the

figure, is progr ammable from 128 to 8192 words (in even powers

of 2) by the respective Subaddress Control Word. As in the sin-

gle message mode, the host processor initially loads the individ-

ual Lookup Table entries. At the start of each message, the ACE

stores the Lookup Table entry in the third position of the respec-

tive message b loc k descriptor in the stack area of RAM, as in the

Single Message mode. The ACE transfers Receive or Transmit

Data Words to (from) the circular buffer, starting at the location

referenced by the Lookup Table pointer.

At the end of a valid (or optionally invalid) message, the value of

the Lookup Table entry updates to the next location after the last

address accessed for the current message. As a result, Data

Words for the next message directed to the same Tx/RX(/Bcst)

subaddress will be accessed from the next contiguous block of

address locations within the circular buffer. As a recommended

option, the Lookup Table pointers may be programmed to not

update following an invalid receive (or broadcast) message.This

allows the 1553 b us controller to retry the failed message , result-

ing in the valid (retried) data overwriting the invalid data. This

eliminates ov erhead f or the RT's host processor .When the point-

er reaches the lower boundary of the circular buffer (located at

128, 256, . . . 8192-word boundaries in the BU-65170/61580

address space), the pointer mov es to the top boundary of the cir-

cular buffer, as FIGURE 6 shows.

Implementing Bulk Data Transfers

The use of the Circular Buff er scheme is ideal for b ulk data trans-

fers; that is, multiple messages to/from the same subaddress.

The recommendation for such applications is to enable the cir-

cular buffer interrupt request. By so doing, the routine transfer of

multiple messages to the selected subaddress, inc luding err ors

and retries, is transparent to the RT's host processor. By strate-

gically initializing the subaddresses' Lookup Table pointer prior to

the start of the bulk transfer, the BU-65170/61580 may be con-

figured to issue an interrupt request only after it has received the

anticipated number of valid Data Words to the designated sub-

address.

SUBADDRESS DOUBLE BUFFERING MODE

F or receiv e (and broadcast) subaddresses , the BU-65170/61580

RT offers a third memory management option, Subaddress

Double Buffering. Subaddress Double Buffering provides a

means of ensuring data consistency.FIGURE 7 illustrates the R T

Subaddress Double Buffering scheme. Like the Single Message

and Circular Buffer modes, the Double Buffering mode may be

selected on a subaddress basis by means of the Subaddress

Control Word. The purpose of the Double Buffering mode is to

provide the host processor a con venient means of accessing the

most recent, valid data received to a given subaddress. This

ser ves to ensure the highest possible degree of data consisten-

cy by allocating two 32-bit Data Word blocks for each individual

receive (and/or broadcast) subaddress.

At a given point in time, one of the two blocks will be designated

as the “active”1553 data block while the other will be designat-

ed as the “inactive”block.The Data Words from the next receive

message to that subaddress will be stored in the “active”block.

Upon completion of the message, provided that the message

was valid and Subaddress Double Buffering is enabled, the BU-

65170/61580 will automatically switch the “active”and “inactive”

blocks for the respective subaddress. The ACE accomplishes

this by toggling bit 5 of the subaddress's Lookup Table Pointer

and rewriting the pointer. As a result, the most recent valid block

of received Data Words will always be readily accessible to the

host processor.

As a means of ensuring data consistency, the host processor is

able to reliab ly access the most recent v alid, received Data W ord

block by performing the following sequence:

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FIGURE 5. RT MEMORY MANAGEMENT: SINGLE MESSAGE MODE

DATA

BLOCKS

DATA BLOCK

BLOCK STATUS WORD

TIME TAG WORD

DATA BLOCK POINTER

RECEIVED COMMAND

WORD

DESCRIPTOR

STACKS

LOOK-UP

TABLE ADDR

LOOK-UP TABLE

(DATA BLOCK ADDR)

15 13 0

CURRENT

AREA B/A

CONFIGURATION

POINTERS

(See note)

Note: Lookup table is not used for mode commands when enchanced mode codes are enabled.

FIGURE 6. RT MEMORY MANAGEMENT: CIRCULAR BUFFER MODE

CIRCULAR

BUFFER

ROLLOVER

15 13 0

RECEIVED

(TRANSMITTED)

MESSAGE

DATA

(NEXT LOCATION)

128,

256

8192

WORDS

POINTER TO

CURRENT

DATA BLOCK

POINTER TO

NEXT DATA

BLOCK

LOOK-UP TABLE

ENTRY

CIRCULAR

DATA

BUFFER

LOOK-UP TABLES

LOOK-UP

TABLE

ADDRESS

BLOCK STATUS WORD

TIME TAG WORD

DATA BLOCK POINTER

RECEIVED COMMAND

WORD

CONFIGURATION

POINTERS DESCRIPTOR

STACK

CURRENT

AREA B/A

TX/RS/BCST_SA LOOK-UP TABLE ENTRY IS UPDATED

FOLLOWING VALID RECEIVE (BROADCAST) MESSAGE OR

FOLLOWING COMPLETION OF TRANSIT MESSAGE.

15 13 0

BLOCK STATUS WORD

TIME TAG WORD

DATA BLOCK POINTER

RECEIVED COMMAND

WORD

CONFIGURATION

POINTERS DESCRIPTOR

STACK

CURRENT

AREA B/A

DATA

BLOCKS

DATA

BLOCK 1

DATA

BLOCK 0

X..X 0 YYYYY

X..X 1 YYYYY

RECEIVE DOUBLE

BUFFER ENABLE

SUBADDRESS

CONTROL WORD

MSB

DATA BLOCK POINTER

LOOK-UP

TABLES

FIGURE 7. RT MEMORY MANAGEMENT: SUBADDRESS DOUBLE BUFFERING MODE

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(1) Disable the double buffering for the respective subad-

dress by the Subaddress Control Word.That is, temporarily

switch the subaddress' memor y management scheme to the

Single Message mode.

(2) Read the current value of the receive (or broadcast) sub-

address's Lookup Table pointer.This points to the current

“active”Data Word block. By inver ting bit 5 of this pointer

value, it is possible to locate the star t of the “inactive”Data

Word block. This block will contain the Data Words received

during the most recent valid message to the subaddress.

(3) Read out the words from the “inactive”(most recent)

Data W ord Block.

(4) Re-enable the Double Buffering mode for the respective

subaddress by the Subaddress Control Word.

RT INTERRUPTS

As in BC mode, the BU-65170/61580 RT provides many mask-

able interrupts. RT interrupt conditions include End of (every)

Message, Message Error, Selected Subaddress (Subaddress

Control Word) Interrupt, Circular Buffer Rollover, Selected Mode

Code Interrupt, and Stack Rollover.

DESCRIPTOR STACK

At the beginning and end of each message, the BU-

65170/61580 RT stores a four-word message descriptor in the

active area stack. The RT stack size is programmable, with

choices of 256, 512, 1024, and 2048 words. FIGURES 5, 6 and

7 show the four words: Block Status Word, Time Tag Word, Data

Block Pointer, and the 1553 received Command Word. The RT

Block Status Word includes indications of message in-progress

or message complete, b us channel, RT-to-RT transfer and RT-to-

R T transfer errors, message f ormat error, loop test (self-test) fail-

ure, circular b uff er rollov er, illegal command, and other error con-

ditions.TABLE 22 shows the bit mapping of the RT Block Status

Word.

As in BC mode, the Time Tag Word stores the current contents

of the BU-65170/61580's read/writable Time Tag Register. The

resolution of the Time Tag Register is programmab le from among

2, 4, 8, 16, 32, and 64 µs/LSB. Also, incrementing of the Time

Tag counter ma y be from an external clock source or via softw are

command.

The A CE stores the contents of the accessed Lookup Table loca-

tion for the current message, indicating the starting location of

the Data Word b lock, as the Data Block Pointer.This serves as a

convenience in locating stored message data blocks. The ACE

stores the full 16-bit 1553 Command Word in the four th location

of the RT message descriptor.

RT COMMAND ILLEGALIZATION

The BU-65170/61580 provides an internal mechanism for RT

command illegalization. In addition, the Busy Status Word bit

can be set so that it is only a programmed subset of the trans-

mit/receive/broadcast subaddresses.

The illegalization scheme uses a 256-word area in the BU-

65170/61580's address space. A benefit of this feature is the

reduction of printed circuit board requirements, by eliminating

the need for an external PROM, PLD, or RAM device that does

the illegalizing function. The BU-J1165170/61580's illegalization

scheme provides maximum flexibility, allowing any subset of the

4096 possible combinations of broadcast/own address, T/R bit,

subaddress, and word count/mode code to be illegalized.

Another advantage of the RAM-based illegalization technique is

that it provides for a high degree of self-testability.

Addressing the Illegalization Table

TABLE 29 illustrates the addressing scheme of the illegalization

RAM. As shown, the base address of the illegalizing RAM is

0300 (hex). The ACE formulates the index into the Illegalizing

Table based on the values of BROADCAST/OWN ADDRESS,

T/R bit, Subaddress, and the MSB of the Word Count/Mode

Code field (WC/MC4) of the current Command Word.

The internal RAM has 256 words reser ved for command illegal-

ization. Broadcast commands may be illegalized separately from

nonbroadcast receive commands and mode commands.

Commands may be illegalized down to the word count level. For

example, a one-word receive command to subaddress 1 may be

legal, while a two-word receive command to subaddress 1 may

be illegalized.

The first 64 words of the Illegalization Table refer to broadcast

receive commands (two words per subaddress). The next 64

words refer to broadcast transmit commands. Since nonmode

code broadcast transmit commands are by definition invalid, this

section of the table (except for subaddresses 0 and 31) does not

need to be initialized by the user.The next 64 words correspond

to nonbroadcast receive commands. The final 64 words refer to

nonbroadcast transmit commands. Messages with Word Count/

Mode Code (WC/MC) fields between 0 and 15 ma y be illegaliz ed

by setting the corresponding data bits for the respective even-

numbered address locations in the illegalization table. Likewise,

messages with WC/MC fields between 16 and 31 may be ille-

galized by setting the corresponding data bits for the respective

odd-numbered address locations in the illegalization table.

The following should be noted with regards to command illegal-

ization:

(1)To illegalize a particular word count for a given broad-

cast/own address-T/R subaddress, the appropriate bit posi-

tion in the respective illegalization word should be set to

logic 1. A bit value of logic 0 designates the respective

Command Word as a legal command.The ACE will respond

to an illegalized nonbroadcast command with the Message

Error bit set in its RT Status Word.

(2)For subaddresses 00001 through 11110, the “WC/MC”

field specifies the Word Count field of the respective

Command Word. For subaddresses 00000 and 11111, the

“WC/MC”field specifies the Mode Code field of the respec-

tive Command Word.

(3)Since nonmode code broadcast transmit messages are

not defined by MIL-STD-1553B, the sixty (60) words in the

illegalization RAM, addresses 0342 through 037D, corre-

sponding to these commands do not need to be initialized.

The ACE will not respond to a nonmode code broadcast

transmit command, but will automatically set the Message

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Error bit in its internal Status Register, regardless of whether

or not corresponding bit in the illegalization RAM has been

set. If the next message is a Transmit Status or Transmit Last

Command mode code, the ACE will respond with its

Message Error bit set.

PROGRAMMABLE BUSY

As a means of providing compliance with Notice 2 of MIL-STD-

1553B, the B U-65170/61580 R T pro vides a software controllab le

means for setting the Busy Status Word bit as a function of sub-

address. By a Busy Lookup Table in the BU-65170/61580

address space, it is possible to set the Busy bit based on com-

mand broadcast/own address, T/R bit, and subaddress. Another

programmable option, allows received Data Words to be either

stored or not stored for messages, when the Busy bit is set.

OTHER RT FUNCTIONS

The BU-65170/61580 allows the hardwired RT Address to be

read by the host processor. Also, there are options for the RT

FLAG Status Word bit to be set under software control and/or

automatically following a failure of the loopback self-test. Other

software controllable RT options include software prog rammable

RT Status and RT BIT words, automatic clearing of the Service

Request Status Word bit following a Transmit Vector Word mode

command, capabilities to clear and/or load the Time Tag Register

following receipt of Synchronize mode commands, options

regarding Data Word transfers for the Busy and/or Message

Error (Illegal) Status Word bits, and for handling of 1553A and

reser ved mode codes.

MONITOR (MT) ARCHITECTURE

The BU-61580 provides three bus monitor (MT) modes:

(1) The “AIM-HY”(default) or “AIM-HY'er”Word Monitor mode.

(2) A Selective Message Monitor mode.

(3) A Simultaneous Remote Terminal/Selective Message Monitor

mode.

The strong recommendation for new applications is the use of

the Selective Message Monitor, rather than the Word Monitor.

Besides providing monitor filtering based on R T Address, T/R bit,

and Subaddress, the Message Monitor eliminates the need to

determine the start and end of messages by softw are.The de vel-

opment of such software tends to be a tedious task.Moreover , at

run time, it tends to entail a high degree of CPU overhead.

WORD MONITOR

In the Word Monitor mode, the BU-61580 monitors both 1553

buses .After initializing the W ord Monitor and putting it on-line the

BU-61580 stores all Command, Status, and Data Words

received from both buses. For each word received from either

bus, the BU-61580 stores a pair of words in RAM.The first word

is the 16 bits of data from the received w ord.The second word is

the Monitor Identification (ID), or “Tag”word. The ID Word con-

tains information relating to bus channel, sync type, word validi-

ty, and interword time gaps. The BU-61580 stores data and ID

words in a circular buffer in the shared RAM address space.

TABLE 23 shows the bit mapping for the Monitor ID word.

MONITOR TRIGGER WORD

There is a Trigger Word Register that provides additional flexibil-

ity f or the Word Monitor mode.The BU-61580 stores the value of

the 16-bit Trigger W ord in the MT Trigger W ord Register.The con-

tents of this register represent the value of the Trigger Command

Word.The BU-61580 has programmable options to star t or stop

the Word Monitor, and/or to issue an interrupt request following

receipt of the Trigger Command Word from the 1553 bus.

SELECTIVE MESSAGE MONITOR MODE

The BU-61580 Selective Message Monitor provides features to

greatly reduce the software and processing burden of the host

CPU .The Selective Message Monitor implements selectiv e mon-

itoring of messages from a dual 1553 bus, with the monitor fil-

tering based on the RT Address, T/R bit, and Subaddress fields

of received 1553 Command Words. The Selective Message

Monitor mode greatly simplifies the host processor software by

distinguishing between Command and Status Words. The

Selective Message Monitor maintains two stacks in the BU-

61580 RAM: a Command Stack and a Data Stack.

Simultaneous RT/Message Monitor Mode

The Selective Message Monitor ma y function as a purely passiv e

monitor or may be programmed to function as a simultaneous

RT/Monitor. The RT/Monitor mode provides complete Remote

Terminal (RT) operation f or the BU-61580's str apped R T address

and bus monitor capability for the other 30 nonbroadcast RT

addresses.This allows the BU-61580 to simultaneously operate

as a full function RT and “snoop”on all or a subset of the bus

activity involving the other RTs on a bus. This type of operation

is sometimes needed to implement a backup bus controller.The

combined RT/Selective Monitor maintains three stack areas in

the BU-61580 address space:an RT Command Stac k, a Monitor

Command Stack, and a Monitor Data Stack.The pointers for the

various stacks have fixed locations in the BU-61580 address

space.

WC4/MC40(LSB) SA01SA12

SA23SA34SA45T/R

6BROADCAST/OWN_ADDRESS

718 19 010

012 013 014 0

15(MSB) DESCRIPTIONBIT

TABLE 29. ILLEGALIZATION RAM ADDRESS DEFINITION

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Selective Message Monitor Memory Organization

TABLE 30 illustrates a typical memory map for the ACE in the

Selective Message Monitor mode. This mode of operation

defines several fixed locations in the RAM.These locations allo-

cate in a manner that is compatible with the combined

RT/Selective Message Monitor mode. Refer to TABLE 30 for an

example of a typical Selective Message Monitor Memory Map.

The fixed memor y map consists of two Monitor Command Stack

Pointers (location 102h and 106h), two Monitor Data Stack

Pointers (locations 103h and 107h), and a Selective Message

Monitor Lookup Table (0280-02FFh) based on RT Address, T/R,

and subaddress. Assume a Monitor Command Stack size of 1K

words, and a Monitor Data Stack size of 2K words.

Refer to FIGURE 8 for an illustration of the Selective Message

Monitor operation. Upon receipt of a valid Command Word, the

BU-61580 will reference the Selective Monitor Lookup Table (a

fixed block of addresses) to check for the condition

(disabled/enabled) of the current command. If disabled, the BU-

61580 will ignore (and not store) the current message;if enabled,

the BU-61580 will create an entry in the Monitor Command

Stack at the address location referenced by the Monitor

Command Stack Pointer.

Similar to RT mode, The ACE stores a Block Status Word, 16-bit

Time Tag Word, and Data Block Pointer in the Message

Descriptor, along with the received 1553 Command Word follow-

ing reception of the Command Word. The ACE writes the Block

Status and Time Tag W ords at both the start and end of the mes-

sage. The Monitor Block Status Word contains indications of

message in-progress or message complete, bus channel,

Monitor Data Stack Rollover, RT-to-RT transfer and RT-to-RT

transf er errors , message format error, and other error conditions.

TABLE 24 shows the Message Monitor Block Status Word. The

Data Block Pointer references the first word stored in the Monitor

Data Stack (the first word following the Command Word) for the

current message. The BU-61580 will then proceed to store the

subsequent words from the message (possible second

Command Word, Data Word(s), Status Word(s)) into consecutive

locations in the Monitor Data Stack.

The size of the Monitor Command Stack is programmable to

256, 1K, 4K, or 16K words.The Monitor Data Stack size is pro-

grammable to 512, 1K, 2K, 4K, 8K, 16K, 32K, or 64K words.

Monitor interrupts may be enabled for Monitor Command Stack

Rollover, Monitor Data Stack Rollover, and/or End-of-Message

conditions. In addition, in the Word Monitor mode there may be

an interrupt enabled for a Monitor Trigger condition.

PROCESSOR AND MEMORY INTERFACE

The ACE terminals provide much flexibility for interfacing to a

host processor and optional external memor y. FIGURE 1 shows

that there are 14 control signals, 6 of which are dual purpose, f or

the processor/memory interface. FIGURES 9 through 14 illus-

trate six of the configurations that may be used for interfacing a

15 13 0

BLOCK STATUS WORD

TIME TAG WORD

DATA BLOCK POINTER

RECEIVED COMMAND

WORD

CONFIGURATION

STACK POINTERS MONITOR

COMMAND STACKS

CURRENT

AREA B/A

MONITOR DATA

STACKS

MONITOR DATA

BLOCK #N + 1

MONITOR DATA

BLOCK #N

CURRENT

COMMAND WORD

MONITOR DATA

STACK POINTERS

IF THIS BIT IS "0" (NOT SELECTED)

NO WORDS ARE STORED IN EITHER

THE COMMAND STACK OR DATA STACK.

IN ADDITION, THE COMMAND AND DATA

STACK POINTERS WILL NOT BE UPDATED.

NOTE

SELECTIVE MONITOR

LOOKUP TABLES

SELECTIVE MONITOR

ENABLE

(SEE NOTE)

OFFSET BASED ON

RTA4-RTA0, T/R, SA4

FIGURE 8. SELECTIVE MESSAGE MONITOR MEMORY MANAGEMENT

Monitor Command Stack Pointer B (fixed location)

Monitor Data Stack A0800-0FFF Monitor Command Stack A0400-07FF Not Used0300-03FF Selective Monitor Lookup Table (fixed area)0280-02FF Not Used0108-027F Monitor Data Stack Pointer B (fixed location)0107

Not Used0104-0105 Monitor Data Stack Pointer A (fixed location)0103 Monitor Command Stack Pointer A (fixed location)0102 Not Used

0000-0101

DESCRIPTION

0106

TABLE 30. TYPICAL SELECTIVE MESSAGE MONITOR

MEMORY MAP (SHOWN FOR 4K RAM)

ADDRESS

(HEX)

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BU-65170 or BU-61580 to a host processor bus. The various

possible configurations ser ve to reduce to an absolute minimum

the amount of glue logic required to interface to 8-, 16-, and 32-

bit processor buses. Also included are features to facilitate inter-

f acing to processors that do not ha ve a “w ait state”type of hand-

shake acknowledgement. Finally, the ACE supports a reliable

interface to an external dual port RAM. This type of interface

minimizes the portion of the available processor bandwidth

required to access the 1553 RAM.

The 16-bit buffered mode (FIGURE 9) is the most common con-

figuration used. It provides a direct, shared RAM interface to a

16-bit or 32-bit microprocessor. In this mode, the ACE's inter nal

address and data buffers provide the necessary isolation

between the host processor's address and data buses and the

corresponding internal memory buses.In the buffered mode, the

1553 shared RAM address space limit is the BU-65170/61580's

4K words of internal RAM. The 16-bit buffered mode provides a

pair of pin-programmable options:

(1) The logic sense of the RD/WR control input is selectable

by the POLARITY_SEL input: For example, write when

RD/WR is low for Motorola 680X0 processors; write when

RD/WR is high for the Intel i960 series microprocessors.

(2) By strapping the input signal ZERO_WAIT to logic "1,"

the ACE terminals may interface to processors that have an

acknowledge type of handshake input to accommodate

hardware controlled wait states; most current processor

chips have such an input. In this case, the BU-65170/61580

will asser t its READYD output low only after it has latched

WRITE data internally or has presented READ data on D15-

D0.

By strapping ZERO_WAIT to logic "0," it is possible to easily

interf ace the BU-65170/61580 to processors that do not ha ve an

acknowledge type of handshake input. An example of such a

processor is Analog Device's ADSP2101 DSP chip. In this con-

figuration, the processor can clear its strobe output before the

completion of access to the BU-65170/61580 internal RAM or

edge of STRBD and will stay high until completion of the trans-

fer. READYD will nor mally be low when ZERO_WAIT is low.

Similar to the 16-bit buffered mode, the 16-bit transparent mode

(FIGURE 10) supports a shared RAM interface to a host CPU.

The transparent mode offers the advantage of allowing the

buff er RAM siz e to be e xpanded to up to 64K words , using e xter-

nal RAM. A disadvantage of the transparent mode is that it

requires e xternal address and data buffers to isolate the proces-

sor buses from the memory/BU-65170/61580 buses.

A modified version of the transparent mode involves the use of

dual port RAM, rather than conventional static RAM. Refer to

FIGURE 11. This allows the host to access RAM very quickly,

the only limitation being the access time of the dual port RAM.

This configuration eliminates the BU-65170/61580 arbitration

delays for memor y accesses.The worst case delay time occurs

only during a simultaneous access by the host and the BU-

65170/61580 1553 logic to the same memory address. In gen-

eral, this will occur very rarely and the ACE limits the delay to

approximately 250 ns.

FIGURE 12 illustrates the connections for the 16-bit Direct

Memory Access (DMA) mode. In this configuration the host

processor , r ather than the A CE terminal, arbitrates the use of the

address and data buses. The arbitration involves the two DMA

output signals Request (DTREQ) and Acknowledge (DTACK),

and the input signal Grant (DTGRT). The DMA interface allows

the ACE components to interface to large amounts of system

RAM while eliminating the need for external buffers. For system

address spaces larger than 64K words, it is necessary for the

host processor to provide a page register for the upper address

bits (above A15) when the BU-65170/61580 accesses the RAM

(while asser ting DTACK low).

The internal RAM is accessible through the standard ACE inter-

face (SELECT, STRBD, READYD, etc). The host CPU may

access external RAM by the ACE's arbitration logic and output

control signals, as illustrated in FIGURE 12.Alternatively, control

of the RAM may be shared by both the host processor and the

ACE, as illustrated in FIGURE 13.The latter requires the use of

external logic, but allows the processor to access the RAM

directly at the full access speed of the RAM, rather than waiting

for the ACE handshake acknowledge output (READYD).

FIGURE 14 illustrates the 8-bit buffered mode. This interface

allows a direct connection to 8-bit microprocessors and 8-bit

microcontrollers. As in the 16-bit buffered configuration, the

buffer RAM limit is the BU-65170/61580's 4K words of internal

RAM. In the 8-bit mode, the host CPU accesses the BU-

65170/61580's internal registers and RAM by a pair of 8-bit reg-

isters embedded in the A CE interface.The 8-bit interface may be

further configured by three strappable inputs: ZERO_WAIT,

POLARITY_SEL, and TRIGGER_SEL. By connecting

ZERO_WAIT to logic "0," the BU-65170/61580 may be interf aced

with minimal "glue" logic to 8-bit microcontrollers, such as the

Intel 8051 series, that do not hav e an Ac knowledge type of hand-

shake input. The programmable inputs POLARITY_SEL and

TRIGGER_SEL allow the BU-65170/61580 to accommodate the

different byte ordering conventions and "A0" logic sense utilized

by different 8-bit processor families.

PROCESSOR INTERFACE TIMING

FIGURES 15 and 16 illustrate the timing for the host processor

to access the ACE's internal RAM or registers in the 16-bit,

buffered, non-zero, wait-mode. FIGURE 15 illustrates the 16-bit

buffered, nonzero wait mode read cycle timing while FIGURE 16

shows the 16-bit, b uff ered, nonz ero wait mode write cycle timing.

During a CPU transfer cycle, the signals STRBD and SELECT

must be sampled low on the rising edge of the system clock to

request access to the BU-65170/61580's internal shared RAM.

The transf er will begin on the first rising system cloc k edge when

(SELECT and STRBD) is low and the 1553 protocol/memory

management unit is not accessing the internal RAM. The falling

edge of the output signal IOEN indicates the start of the transfer.

The ACE latches the signals MEM/REG and RD/WR internally

on the first falling clock edge after the start of the transfer cycle.

The address inputs latch internally on the first r ising clock edge

after the signal IOEN goes low. Note that the address lines may

be latched at any time using the ADDR_LAT input signal.

The output signal READYD will be asser ted low on the third ris-

ing system clock edge after IOEN goes low. The assertion of

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READYD low indicates to the host processor that read data is

available on the parallel data bus, or that write data has been

stored. At this time, the CPU should bring the signal STRBD

high, completing the transfer cycle.

Address Latch Timing

FIGURE 17 illustrates the operation and timing of the address

input latches for the buffered interface mode. In the transparent

mode, the address buffers are always transparent. Since the

transparent mode requires the use of external buffers, external

address latches would be required to demultiplex a multiplexed

address bus. In the buffered mode, however, the ACE's internal

address latches ma y be used to perf orm the demultiplexing func-

tion.

The ADDR_LAT input signal controls address latch operation.

When ADDR_LAT is high, the outputs of the latch (which drive

the A CE's internal memory bus) trac k the state of address inputs

A15 – A00. When it is low, the internal memory bus remains

latched at the state of A15 – A00 just prior to the falling edge of

ADDR_LAT.

MISCELLANEOUS

SELF-TEST

The BU-65170/61580 products incorporate several self-test fea-

tures.These features include an on-line wraparound self-test for

all messages in BC and RT modes, an off-line wraparound self-

test for BC mode, and several other internal self-test features.

The BC/RT on-line loop test involves a wraparound test of the

encoder/decoder and transceiver. The BC off-line self-test

involves the encoder/decoder, but not the transceiver. These

tests entail checking the received version of every transmitted

word for validity (sync, encoding, bit count, parity) and checking

the received version of the last transmitted word for a bit-by-bit

comparison with the encoded word. The loopback test also fails

if there is a timeout of the internal transmitter watchdog timer.

Note that the timeout value of the watchdog timer depends on

the mode of operation selected (1553A or 1553B).A failure of the

loop test results in setting a bit in the message's Block Status

Word and, if enabled, will result in an interrupt request. With

appropriate host processor software, the BC off-line test is able

to exercise the parallel and serial data paths, encoder, decoder,

and a substantial portion of the BC protocol and memory man-

agement logic.

There are additional built-in self-test features, that involve the

use of three configuration register bits and the eight test regis-

ters.This allows a test of appro ximately 99% of the J’chip's inter-

nal logic.These tests include an encoder test, a decoder test, a

ter timeout) timer.

There is also a test mode. In the test mode, the host processor

can emulate arbitrary activity on the 1553 buses by writing to a

pair of test registers.The test mode can be operated in conjunc-

tion with the Word Monitor mode to facilitate end-to-end self-

tests.

RAM PARITY GENERATION AND CHECKING

The architecture of the J’monolithic is such that the amount of

buffered RAM may be extended beyond the 4K words of on-chip

J’ RAM. For this off-chip buffered RAM, the J’chip includes pro-

visions to implement parity generation and checking. Parity gen-

eration and checking provides a mechanism for checking the

data integrity of the inter nal, buffered memor y. Furthermore, 17-

bit, rather than 16-bit, wide b uffered RAM w ould be used.F or this

RAM, the J’chip will generate the 17th bit (parity bit) for all (host

and 1553) write accesses and check the parity bit for all read

accesses. If a parity error occurs, an interrupt request may be

issued, and the corresponding bit in the Interrupt Status Register

would be set.The BU-61585 incorporates an additional 8K x 17

RAM chip.

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FIGURE 9. 16-BIT BUFFERED MODE

HOST ACE

55 Ω

3CH. A

TX/RXA

55 Ω

3CH. B

TX/RXB

RTAD4-RTAD0 RT

ADDRESS,

PARITY

RTADP

D15-D0

+5V+15V

CLK IN

16 MHz

CLOCK

OSCILLATOR

N/C

POLARITY_SEL

(NOTE 2)

ZERO_WAIT

(NOTE 3)

ADDRESS

DECODER

SELECT

MEM/REG

RD/WR

STRBD

READYD

TAG_CLK

RD/WR

CPU STROBE

CPU ACKNOWLEDGE (NOTE 4)

RESET

NOTES:

+5V

MSTCLR

SSFLAG/EXT_TRIG

INT

CPU INTERRUPT REQUEST

3. ZERO_WAIT SHOULD BE STRAPPED TO

LOGIC "1" FOR NON-ZERO WAIT INTERFACE

AND TO LOGIC "0" FOR ZERO WAIT INTERFACE.

4. CPU ACKNOWLEDGE PROCESSOR INPUT ONLY

FOR NON-ZERO WAIT TYPE OF INTERFACE.

1. CPU ADDRESS LATCH SIGNAL PROVIDED BY

PROCESSORS WITH MULTIPLEXED ADDRESS/DATA

BUSES.

2. IF POLARITY_SEL = "1", RD/WR IS HIGH TO READ,

LOW TO WRITE.

IF POLARITY_SEL = "0", RD/WR IS LOW TO READ,

HIGH TO WRITE.

A15-A12

A11-A0

N/C

ADDR_LAT

TRANSPARENT/BUFFERED

CPU ADDRESS LATCH (NOTE 1)

+5V

16/8_BIT

TRIGGER_SEL

MSB/LSB

+5V

*Additional address lines A12 and A13 are required with the BU-61585.

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FIGURE 10. 16-BIT TRANSPARENT MODE

HOST ACE

55 Ω

3CH. A

TX/RXA

55 Ω

3CH. B

TX/RXB

RTAD4-RTAD0 RT

ADDRESS,

PARITY

RTADP

D15-D0

+5V+15V

CLK IN

16 MHz

CLOCK

OSCILLATOR

RD/WR

STRBD

READYD

TAG_CLK

CPU STROBE

CPU ACKNOWLEDGE

RESET

+5V

MSTCLR

SSFLAG/EXT_TRIG

INT

CPU INTERRUPT REQUEST

'245

DIR EN

CPU D15-D0

RAM

64K x 16 MAX

MEMWR

MEMOE

IOEN

DTREQ

DTGRT

'244

ADDRESS

DECODER

ADDRESS

DECODER

MEMENA-IN

A15-A0

CPU A15-A0

MEMENA-OUT

SELECT

MEM/REG

TRANSPARENT/BUFFERED

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FIGURE 11. 16-BIT TRANSPARENT MODE USING DUAL PORT RAM

HOST ACE

DUAL

PORT

RAM

CS-L

WR-L

OE-L

CS-R

WR-R

OE-R

MEMENA-OUT

MEMWR

MEMOE

BUSY-L BUSY-R N/C

CPU D15-D0

CPU ADDRESS

DIR

'245

'244

D15-D0

A15-A0

CPU A4-A0 A4-A0

RD/WR RD/WR

ADDRESS

DECODER

1553 RAM SELECT

1553 REG SELECT

MEM/REG

IOEN

DTREQ

DTGRT

DTACK

N/C SELECT

STRBD

CPU DATA STROBE

TRANSPARENT/BUFFERED

+5V

INT

CPU INTERRUPT REQUEST

READYD

RESET

+5V

MSTCLR

CPU READY

MEMENA-IN

+5V

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FIGURE 12. 16-BIT DIRECT MEMORY ACCESS (DMA) MODE

HOST ACE

55 Ω

3CH. A

TX/RXA

55 Ω

3CH. B

TX/RXB

RTAD4-RTAD0 RT

ADDRESS,

PARITY

RTADP

D15-D0

+5V+15V

CLK IN

16 MHz

CLOCK

OSCILLATOR

ADDRESS

DECODER

SELECT

MEM/REG

RESET

+5V

MSTCLR

SSFLAG/EXT_TRIG

INT

CPU INTERRUPT REQUEST

CPU D15-D0

RAM

64K x 16 MAX

MEMWR

MEMOE

RD/WRRD/WR

DTREQ

DTGRT

DTACK

A15-A0

ADDRESS

DECODER MEMENA-IN

MEMENA-OUT

TRANSPARENT/BUFFERED

+5V

STRBD

READYD

TAG_CLK

CPU STROBE

CPU ACKNOWLEDGE

CPU A15-A0

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FIGURE 13. 16-BIT DMA MODE WITH EXTERNAL LOGIC TO REDUCE

PROCESSOR ACCESS TIME TO EXTERNAL RAM

HOST ACE

55 Ω

3CH. A

TX/RXA

55 Ω

3CH. B

TX/RXB

RTAD4-RTAD0 RT

ADDRESS,

PARITY

RTADP

D15-D0

+5V+15V

CLK IN

16 MHz

CLOCK

OSCILLATOR

ADDRESS

DECODER

RESET

+5V

MSTCLR

SSFLAG/EXT_TRIG

INT

CPU INTERRUPT REQUEST

CPU D15-D0

RAM

64K x 16 MAX

RD/WR

DTREQ

DTGRT

DTACK

A15-A0

MEMENA-IN

MEMENA-OUT

TRANSPARENT/BUFFERED

+5V

STRBD

READYD

TAG_CLK

MEMWR

MEMOE

CPU A15-A0

+5V

1553 RAM SELECT

1553 REG SELECT

MEM/REG

SELECT

CPU STROBE

CPU ACKNOWLEDGE

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FIGURE 14. 8-BIT BUFFERED MODE

*Additional address lines A12 and A13 are required with the BU-61585.

HOST ACE

55 Ω

3CH. A

TX/RXA

55 Ω

3CH. B

TX/RXB

RTAD4-RTAD0 RT

ADDRESS,

PARITY

RTADP

D15-D8

+5V+15V

CLK IN

16 MHz

CLOCK

OSCILLATOR

POLARITY_SEL

(NOTE 3)

ZERO_WAIT

(NOTE 4)

ADDRESS

DECODER

SELECT

MEM/REG

RD/WR

STRBD

READYD

TAG_CLK

RD/WR

CPU STROBE

CPU ACKNOWLEDGE (NOTE 6)

RESET

NOTES:

+5V

MSTCLR

SSFLAG/EXT_TRIG

INT

CPU INTERRUPT REQUEST

TRANSFERS ARE TRIGGERED BY THE MOST SIGNIFICANT

BYTE TRANSFER READ ACCESSES AND BY THE

LEAST SIGNIFICANT BYTE TRANSFER FOR WRITE ACCESSES.

IF TRIGGER_SEL = "0", THEN INTERNAL 16-BIT

TRANSFERS ARE TRIGGERED BY THE LEAST SIGNIFICANT

BYTE TRANSFER FOR READ ACESSES AND BY THE MOST

SIGNIFICANT BYTE TRANSFER FOR WRITE ACCESSES.

FOR ZERO WAIT INTERFACE (ZERO WAIT = "0"):

IF TRIGGER_SEL = "1", THEN INTERNAL 16-BIT

TRANSFERS ARE TRIGGERED BY THE LEAST SIGNIFICANT

BYTE TRANSFER, FOR BOTH READ AND WRITE ACCESSES.

IF TRIGGER_SEL = "0", THEN INTERNAL 16-BIT

TRANSFERS ARE TRIGGERED BY THE MOST SIGNIFICANT

BYTE TRANSFER, FOR BOTH READ AND WRITE ACCESSES.

6. CPU ACKNOWLEDGE PROCESSOR INPUT ONLY FOR NON-ZERO

WAIT TYPE OF INTERFACE.

1. CPU D7-D0 CONNECTS TO BOTH D15-D8 AND

D7-D0.

2. CPU ADDRESS LATCH SIGNAL PROVIDED BY PROCESSORS

WITH MULTIPLEXED ADDRESS/DATA BUFFERS.

3. IF POLARITY_SEL = "1", THEN MSB/LSB SELECTS THE MOST

SIGNIFICANT BYTE WHEN LOW, AND THE LEAST

SIGNIFICANT BYTE WHEN HIGH.

IF POLARITY_SEL = "0", THEN MSB/LSB SELECTS THE LEAST

SIGNIFICANT BYTE WHEN LOW, AND THE MOST

SIGNIFICANT BYTE WHEN HIGH.

4. ZERO WAIT SHOULD BE STRAPPED TO LOGIC "1" FOR

NON-ZERO WAIT INTERFACE AND TO LOGIC "0" FOR

ZERO WAIT INTERFACE.

5. OPERATION OF TRIGGER_SELECT INPUT IS AS FOLLOWS:

FOR NON-ZERO WAIT INTERFACE (ZERO WAIT = "1"):

IF TRIGGER_SEL = "1", THEN INTERNAL 16-BIT

A15-A12

A11-A0

N/C

ADDR_LAT

CPU ADDRESS LATCH

(NOTE 1)

16/8_BIT

TRANSPARENT/BUFFERED

+5V

CPU D7-D0

(NOTE 2)

A12-A1CPU A12-A0

MSB/LSB

CPU A0

TRIGGER_SEL

(NOTE 5)

D7-D0

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FIGURE 15. CPU READING RAM (SHOWN FOR 16-BIT, BUFFERED, NONZERO WAIT MODE)

CLOCK IN

VALID

t3 t8

t11

t13 t15

VALID t10

t4 t9 t12

t19

;

;;

VALID

t16

t17

SELECT

(Note 2,7)

(Note 2)

(Note 3,4,7)

(Note 4,5)

STRBD

MEM/REG

RD/WR

IOEN

(Note 2,6)

(Note 6)

(Note 7,8,9)

READYD

A15-A0

D15-D0

;

;;

;;;

;;

t2 t6 t14 t18

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Notes for FIGURE 15 and associated table.

1. For the 16-bit buffered nonzero wait configuration, TRANSPA-

RENT/BUFFERED must be connected to logic "0". ZERO_WAIT

and DTREQ/16/8 must be connected to logic "1". The inputs TRIG-

GER_SEL and MSB/LSB may be connected to either +5 V or

ground.

2. SELECT and STRBD may be tied together. IOEN goes low on

the first rising CLK edge when SELECT•STRBD is sampled low

(satisfying t1) and the BU-65170/61580's protocol/memory manage-

ment logic is not accessing the internal RAM. When this occurs,

IOEN goes low, starting the transfer cycle. After IOEN goes low,

SELECT may be released high.

3. MEM/REG must be presented high for memory access, low for

4. MEM/REG and RD/WR are buffered transparently until the first

falling edge of CLK after IOEN goes low. After this CLK edge,

MEM/REG and RD/WR become latched internally.

5.The logic sense for RD/WR in the diagram assumes that POLAR-

ITY_SEL is connected to logic "1." If POLARITY_SEL is connected

to logic "0," RD/WR must be asserted low to read.

6.The timing for IOEN, READYD and D15-D0 assumes a 50 pf

load. For loading above 50 pf, the validity of IOEN, READYD, and

D15-D0 is delayed by an additional 0.14 ns/pf typ, 0.28 ns/pf max.

7.Timing for A15-A0, MEM/REG and SELECT assumes ADDR-LAT

is connected to logic "1." Refer to Address Latch timing for addition-

al details.

8. Inter nal RAM is accessed by A11 through A0 (A13 through A0 for

61585 and 61586). Registers are accessed by A4 through A0.

9.The address bus A15-A0 is inter nally buffered transparently until

the first rising edge of CLK after IOEN goes low. After this CLK

edge, A15-A0 become latched internally.

10. Setup time given for use in worst case timing calculations.

None of the ACE input signals are required to be synchronized to

the system clock. For ACE applications only, where SELECT and

STRBD do not meet the setup time of t1, but occur during the setup

window of an internal flip-flop, an additional clock cycle will be

inser ted between the falling clock edge that latches MEM/REG and

RD/WR and the rising clock edge that latches the Address (A15-

A0). When this occurs, the pulse width of IOEN falling to READYD

falling (t11) increases by one clock cycle and the address hold time

(t10) must be increased be one clock cycle.

REF DESCRIPTION MIN TYP MAX UNITS NOTE REFERENCE

t1 SELECT and STRBD low setup time prior to clock rising edge 10 ns notes 2, 10

t2 107.5 ns notes 2, 6

3.7

128.3

2.8

µs

notes 2, 6

t3 10 ns notes 3, 4, 5, 7

t3 20 ns notes 3, 4, 5, 7

Address valid setup time following SELECT and STRBD low (@ 12 MHz)

Address valid setup time following SELECT and STRBD low (@ 16 MHz)

t5 SELECT hold time following IOEN falling

CLOCK IN rising edge delay to IOEN falling edge 035 ns

ns note 2

note 6

Address valid setup time prior to CLOCK IN rising edge

MEM/REG, RD/WR hold time prior to CLOCK IN falling edge

MEM/REG, RD/WR setup time prior to CLOCK IN falling edge

notes 7, 8, 9

notes 3, 4, 5, 7

t12

t11

t10

Output Data valid prior to READYD falling (@ 12 MHz)

Output Data valid prior to READYD falling (@ 16 MHz)

IOEN falling delay to READYD falling (reading registers @ 12 MHz)

IOEN falling delay to READYD falling (reading registers @ 16 MHz)

IOEN falling delay to READYD falling (reading RAM @ 12 MHz)

IOEN falling delay to READYD falling (reading RAM @ 16 MHz)

Address hold time following CLOCK IN r ising edge

235

170

235

170

250

187.5

250

187.5

265

205

265

205

note 6

notes 6, 10

notes 7, 8, 9, 10

SELECT and STRBD low delay to IOEN low (uncontended access @ 16 MHz)

SELECT and STRBD low delay to IOEN low (contended access @ 16 MHz)

SELECT and STRBD low delay to IOEN low (contended access @ 12 MHz)

SELECT and STRBD low delay to IOEN low (uncontended access @ 12 MHz)

MEM/REG, RD/WR setup time following SELECT and STRBD low(@ 12 MHz)

TABLE FOR FIGURE 15. CPU READING RAM OR REGISTERS (SHOWN FOR 16-BIT, BUFFERED, NONZERO WAIT MODE)

MEM/REG, RD/WR setup time following SELECT and STRBD low(@ 16 MHz)

note 6ns35CLOCK IN rising edge delay to READYD fallingt13

∞

READYD falling to STRBD rising release timet14

note 6ns30STRBD rising edge delay to IOEN rising edge and READYD rising edget15

note 6ns0Output Data hold time following STRBD r ising edget16

ns40STRBD r ising delay to output Data tri-statet17

ns0STRBD high hold time from READYD risingt18 ns60CLOCK IN rising edge delay to Output Data validt19

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FIGURE 16. CPU WRITING RAM (SHOWN FOR 16-BIT, BUFFERED, NONZERO WAIT MODE)

CLOCK IN

t18

t16

VALID

t8 t9

t14

t15 t17

VALID t12

t10

t11

VALID t13

SELECT

(Note 2,7)

(Note 2)

(Note 3,4,7)

(Note 4,5)

STRBD

MEM/REG

RD/WR

IOEN

(Note 2,6)

(Note 6)

(Note 9,10)

(Note 7,8,9,10)

READYD

A15-A0

D15-D0

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ns0STRBD valid high hold time from READYD rising edget18

note 6ns30STRBD r ising edge delay to IOEN rising edge and READYD rising edget17

∞

READYD falling to STRBD rising edge release timet16

note 6ns35CLOCK IN r ising edge delay to READYD fallingt15

note 2ns0SELECT hold time following IOEN fallingt7

ns50Address valid setup time following SELECT and STRBD low (@ 12 MHz)t4

notes 2, 6

notes 2, 6ns128.3SELECT and STRBD low delay to IOEN low (uncontended access @ 12 MHz)t2

notes 7, 8, 9ns30Address valid setup time prior to CLOCK IN rising edget10 ns10Input Data valid setup time prior to CLOCK IN rising edget11

notes 9, 10ns30Input Data valid hold time following CLOCK IN rising edget13 notes 7, 8, 9, 10ns30Address valid hold time following to CLOCK IN rising edget12

notes 3, 4, 5, 7ns30MEM/REG, RD/WR hold time prior to CLOCK IN falling edget9

notes 6, 10

265

205

250

187.5

235

170

IOEN falling delay to READYD falling (@ 16 MHz)

t14

notes 3, 4, 5, 7ns10MEM/REG, RD/WR setup time prior to CLOCK IN falling edget8

note 6ns

CLOCK IN rising edge delay to IOEN falling edge

Input Data valid setup time following SELECT and STRBD low (@ 12 MHz)

Input Data valid setup time following SELECT and STRBD low (@ 16 MHz)

ns30Address valid setup time following SELECT and STRBD low (@ 16 MHz)t4

notes 3, 4, 5, 7ns20MEM/REG, RD/WR setup time following SELECT and STRBD low(@ 12 MHz)t3 notes 3, 4, 5, 7ns10MEM/REG, RD/WR setup time following SELECT and STRBD low(@ 16 MHz)t3

notes 2, 6µs2.8SELECT and STRBD low delay to IOEN low (contended access @ 16 MHz)t2

notes 2, 6ns107.5SELECT and STRBD low delay to IOEN low (uncontended access @ 16 MHz)t2

notes 2, 10ns10SELECT and STRBD low setup time prior to CLOCK IN rising edget1

NOTE REFERENCEUNITSMAXTYPMINDESCRIPTIONREF

µs3.7SELECT and STRBD low delay to IOEN low (contended access @ 12 MHz)t2

TABLE FOR FIGURE 16. CPU WRITING RAM OR REGISTERS (SHOWN FOR 16-BIT, BUFFERED, NONZERO WAIT MODE)

6.The timing for IOEN, READYD and D15-D0 assumes a 50 pf

load. For loading above 50 pf, the validity of IOEN, READYD, and

D15-D0 is delayed by an additional 0.14 ns/pf typ, 0.28 ns/pf max.

7.Timing for A15-A0, MEM/REG and SELECT assumes ADDR-LAT

is connected to logic "1." Refer to Address Latch timing for addition-

al details.

8. Inter nal RAM is accessed by A11 through A0 (A13 through A0 for

61585 and 61586). Registers are accessed by A4 through A0.

9.The address bus A15-A0 is inter nally buffered transparently until

the first rising edge of CLK after IOEN goes low. After this CLK

edge, A15-A0 become latched internally.

10. Setup time given for use in worst case timing calculations.

None of the ACE input signals are required to be synchronized to

the system clock. For ACE applications only, where SELECT and

STRBD do not meet the setup time of t1, but occur during the setup

window of an internal flip-flop, an additional clock cycle will be

inser ted between the falling clock edge that latches MEM/REG and

RD/WR and the rising clock edge that latches the Address (A15-A0)

and data (D15-D0). When this occurs, the pulse width of IOEN

falling to READYD falling (t14) increases by one clock cycle and the

address hold time (t12 + t13) must be increased be one clock cycle.

Notes for FIGURE 16 and associated table.

1. For the 16-bit buffered nonzero wait configuration, TRANSPA-

RENT/BUFFERED must be connected to logic "0". ZERO_WAIT

and DTREQ/16/8 must be connected to logic "1". The inputs TRIG-

GER_SEL and MSB/LSB may be connected to either +5 V or

ground.

2. SELECT and STRBD may be tied together. IOEN goes low on

the first rising CLK edge when SELECT•STRBD is sampled low

(satisfying t1) and the BU-65170/61580's protocol/memory manage-

ment logic is not accessing the internal RAM. When this occurs,

IOEN goes low, starting the transfer cycle. After IOEN goes low,

SELECT may be released high.

3. MEM/REG must be presented high for memory access, low for

4. MEM/REG and RD/WR are buffered transparently until the first

falling edge of CLK after IOEN goes low. After this CLK edge,

MEM/REG and RD/WR become latched internally.

5.The logic sense for RD/WR in the diagram assumes that POLAR-

ITY_SEL is connected to logic "1." If POLARITY_SEL is connected

to logic "0," RD/WR must be asserted high to wr ite.

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FIGURE 17. ADDRESS LATCH TIMING

SELECT

MSB/LSB

MEM/REG

(1) (2) (3) (4) (5)

(1) (2) (3) (4)

t4 t5

A15-A0

ADDR_LAT

SELECT

MSB/LSB

MEM/REG

A15-A0

INPUT

SIGNALS

INTERNAL

VALUES

TABLE FOR FIGURE 17. ADDRESS LATCH TIMING

REF DESCRIPTION MIN TYP MAX UNITS

t1 ADDR_LAT pulse width 20 ns

t2 ADDR_LAT high delay to internal signals valid 10 ns

t3 Propagation delay from exter nal input signals to internal signals valid 10 ns

t4 Input hold time following falling edge of ADDR_LAT

Input setup time prior to falling edge of ADDR_LAT 20

10 ns

Notes for FIGURE 17 and associated table.

1. Applicable to buffered mode only. Address SELECT AND MEM/REG latches are always transparent in the transparent mode of operation.

2. Latches are transparent when ADDR_LAT is high. Inter nal values do not update when ADDR_LAT is low.

3. MSB/LSB input signal is applicable to 8-bit mode only (16/8 input = logic “0”). MSB/LSB input is a “don’t care”for 16-bit operation.

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INTERFACE TO MIL-STD-1553 BUS

FIGURE 18 illustrates the interface from the various versions of

the A CE series terminals to a 1553 bus .The figure also indicates

connections for both direct (short stub) and transformer (long

stub) coupling, plus the peak-to-peak voltage levels that appear

at various points (when transmitting).

TABLE 31 lists the characteristics of the required isolation trans-

formers for the various ACE terminals, the DDC and Beta

Transformer Technology Corporation corresponding part num-

ber, and the MIL (DESC) drawing number (if applicable). Beta

Transfor mer Technology is a direct subsidiary of DDC.

For both coupling configurations, the isolation transformer is the

transformer that interfaces directly to the ACE component. For

the transformer (long stub) coupling configuration, the trans-

former that interfaces the stub to the bus is the coupling trans-

former. The turns ratio of the isolation transformer varies,

depending upon the peak-to-peak output voltage of the specific

ACE terminal.

The transmitter voltage of each model of the BU-65170/61580

varies directly as a function of the power supply voltage. The

turns ratios of the respective transfor mers will yield a secondar y

voltage of approximately 28 volts peak-to-peak on the outer taps

(used for direct coupling) and 20 volts peak-to-peak on the inner

taps (used for stub coupling).

In accordance with MIL-STD-1553B, the turns ratio of the cou-

pling transformer is 1.0 to 1.4. Both coupling configurations

require an isolation resistor to be in series with each leg con-

necting to the 1553 bus; this protects the bus against short cir-

cuit conditions in the transformers, stubs, or terminal compo-

nents.

Notes for TABLE 31 and FIGURE 18:

(1) Shown for one of two redundant buses that interface to the BU-65170 or BU-

61580.

(2) Transmitted voltage level on 1553 bus is 6 Vp-p min, 7 Vp-p nominal, 9 Vp-p

max.

(3) Required tolerance on isolation resistors is 2%. Instantaneous power dissipa-

tion (when transmitting) is approximately 0.5 W (typ), 0.8 W (max).

(4) Transformer pin numbering is correct for the DDC (e.g., BUS-25679) trans-

formers. For the Beta transformers (e.g., B-2203) or the QPL-21038-31 transfor m-

ers (e.g., M21038/27-02), the winding sense and turns ratio are mechanically the

same, but with reversed pin numbering; therefore, it is necessar y to reverse pins

8 and 4 or pins 7 and 5 for the Beta or QPL transformers (Note: DDC transformer

par t numbers begin with a BUS- prefix, while Beta transfor mer part numbers

begin with a B- prefix).

(5)The B-2204, B-2388, and B-2344 transformers have a slightly different tur ns

ratio on the direct coupled taps then the turns ratio of the BUS-29854 direct cou-

pled taps.They do, however, have the same transformer coupled ratio. For trans-

former coupled applications, either transfor mer may be used.The transceiver in

the BU-65170X2 and the BU-61580X2 was designed to wor k with a 1:0.83 ratio

for direct coupled applications. For direct coupled applications, the 1.20:1 turns

ration is recommended, but the 1.25:1 may be used. The 1.25:1 tur ns ratio will

result in a slightly lower transmitter amplitude. (Approximately 3.6% lower) and a

slight shift in the ACE's receiver threshold.

TABLE 31. ISOLATION TRANSFORMER GUIDE

RECOMMENDED XFORMERTURNS RATIO

ACE PART

NUMBER SURFACE

MOUNT

PLUG-INXFORMER

COUPLED

DIRECT

COUPLED

BUS-25679,

B-2203,

M21038/27

-03

2:11.41:1

LPB-5001

LPB-5008

LPB-6001

LPB-6008

BUS-29854

B-2204,

M21038/27

-03

1:0.61.20:1

1.25:1

(Note 5)

See Table 32

1:1.791:2.5

BU-65170X1

BU-65171X1

BU-61580X1

BU-61581X1

BU-61585X1

BU-61586X1

BU-65170X3

BU-65171X3

BU-61580X3

BU-61581X3

BU-61585X3

BU-61586X3

BU-65170X6

BU-65171X6

BU-61580X6

BU-61581X6

BU-61585X6

BU-61586X6

BU-65170X2

BU-65171X2

BU-61580X2

BU-61581X2

BU-61585X2

BU-61586X2

B-2387

M21038/27

-12,

M21038/27

-17

LPB-5002

LPB-5009

LPB-6002

LPB-6009

B-2388

M21038/27

-13,

B-2334,

M21038/27

-18

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TRANSFORMERS

In selecting isolation transformers to be used with the X3, X6

ACE, there is a limitation on the maximum amount of leakage

inductance. If this limit is exceeded, the transmitter rise and fall

times may increase, possibly causing the bus amplitude to fall

below the minimum level required by MIL-STD-1553. In addition,

an excessive leakage imbalance may result in a transformer

dynamic offset that exceeds 1553 specifications.

The maximum allowable leakage inductance is 6.0 µH, and

is measured as follows:

The side of the transfor mer that connects to the ACE is defined

as the “primary”winding. If one side of the primar y is shor ted to

the primary center-tap, the inductance should be measured

across the “secondary”(stub side) winding. This inductance

must be less than 6.0 µH. Similarly, if the other side of the pri-

mary is shorted to the primar y center-tap, the inductance mea-

sured across the “secondary”(stub side) winding must also be

less than 6.0 µH.

The difference between these two measurements is the

“differential”leakage inductance. This value must be less than

1.0 µH.

Beta Transformer Technology Corporation (BTTC), a subsidiary

of DDC, manufactures transformers in a variety of mechanical

configurations with the required turns ratios of 1:2.5 direct cou-

pled, and 1:1.79 transfor mer coupled. TABLE 32 provides a list-

ing of many of these transformers.For further information, con-

tact BTTC at 631-244-7393 or at www.bttc-beta.com.

DLP-7014

SLP-8007

SLP-8024

NOT RECOMMENDED

LPB-5015

B-3310

HLP-6015

Dual epoxy transformer, side by side, surface mount, 0.930" X 0.630", 0.155" max height

DLP-7115 (see note 2)Dual epoxy transformer, side by side, surface mount, 1.410" X 0.750", 0.130" max height

Single metal transfor mer, hermetically sealed, surface mount, 0.630" X 0.630", 0.175" max height

B-3261

HLP-6014

Dual epoxy transformer, side by side, flat pack, 0.930" X 0.630", 0.155" max height

Single metal transfor mer, hermetically sealed, flat pack, 0.630" X 0.630", 0.175" max height

B-3300Dual epoxy transformer, side by side, through-hole, 0.930" X 0.630", 0.155" max height

TST-9027Dual epoxy transformer, twin stacked, flat pack, 0.625" X 0.625", 0.280" max height

TST-9017Dual epoxy transformer, twin stacked, surface mount, 0.625" X 0.625", 0.280" max height

TST-9007Dual epoxy transformer, twin stacked, 0.625" X 0.625", 0.280" max height

B-3819

LPB-5014

Single epoxy transformer, surface mount, hi-temp solder, 0.625" X 0.625", 0.220" max height. May

be used with BU-6XXXXX4 versions of the Enhanced Mini-ACE.B-3819

Single epoxy transformer, flat pack, 0.625" X 0.625", 0.150" max height

B-3227

Single epoxy transformer, surface mount, 0.625" X 0.625", 0.275" max height

B-3231

Single epoxy transformer, flat pack, 0.625" X 0.625", 0.275" max height

B-3818

B-3067

B-3226

Single epoxy transformer, through-hole, 0.625" X 0.625", 0.220" max height.

May be used with BU-6XXXXX4 versions of the Enhanced Mini-ACE.

Single epoxy transformer, through-hole, 0.625" X 0.625", 0.250" max height

BTTC PART NO.TRANSFORMER CONFIGURATION

Single epoxy transformer, surface mount, 0.625" X 0.625", 0.150" max height

B-3229Single epoxy transformer, through hole, transformer coupled only, 0.500" X 0.350", 0.250" max height

TABLE 32. BTTC TRANSFORMERS FOR USE WITH X3, X6 ACE

Notes:

1. For the BU-6XXXXX3/6 versions of the ACE with -1553B transceivers, any of the transfor mers listed in the table may be used.

2. DLP-7115 operates to +105°C max. All other transfor mers listed operate to +130°C max.

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Note:The BU-65170XX, BU-65171XX, BU-61581XX, BU-61585XX and BU-61586XX models are interfaced the same as the corresponding BU-61580XX model is shown

(i.e.The BU-65170X1 is interfaced the same as the BU-61580X1).

FIGURE 18. BU-65170/61580 INTERFACE TO A 1553 BUS

BU-61580X1

55 Ω

1.4:1

39 VPP 28 VPP

1 FT MAX

2:1

20 VPP

1:1.4

COUPLING

TRANSFORMER

ISOLATION

TRANSFORMER

ISOLATION

TRANSFORMER

TRANSFORMER COUPLED (LONG STUB)

20 FT MAX

28 VPP

DIRECT COUPLED (SHORT STUB)

COUPLING

TRANSFORMER

ISOLATION

TRANSFORMER

ISOLATION

TRANSFORMER

DIRECT COUPLED (SHORT STUB)

BU-61580X2

1:0.83

28 VPP

1 FT MAX

1:0.6

33 VPP 20 VPP

1:1.4

TRANSFORMER COUPLED (LONG STUB)

20 FT MAX

28 VPP

COUPLING

TRANSFORMER

ISOLATION

TRANSFORMER

ISOLATION

TRANSFORMER

DIRECT COUPLED (SHORT STUB)

BU-61580X3

BU-61580X6

1:2.5

11.6 VPP 28 VPP

1:1.79

11.6 VPP 20 VPP

1:1.4

TRANSFORMER COUPLED (LONG STUB)

20 FT MAX

28 VPP

55 Ω

Z0 (70 to 85Ω)

39 VPP

0.75 Z0

33 VPP

55 Ω

Z0 (70 to 85Ω)

0.75 Z0

1 FT MAX

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SIGNAL NAME

PROCESSOR/MEMORY INTERFACE AND CONTROL (15)

DESCRIPTION

TRANSPARENT/

BUFFERED (1) 64

STRBD (1) 4Strobe Data. Used with SELECT to initiate and control the data transfer cycle between the host processor and the BU-

65170/61580.

SELECT (1) 3Generally connected to a CPU address decoder output to select the BU-65170/61580 for a transfer to/from either RAM

or register. May be tied to STRBD.

MEM/REG (1) 5Memory/Register. Generally connected to either a CPU address line or address decoder output. Selects between mem-

ory access (MEM/REG = 1 ) or register access (MEM/REG = 0 ).

Tri-state control for external address and data buffers. Generally not needed in the buffered mode. When low, external

buffers should be to allow the host processor access to the BU-65170/61580’s RAM and registers.

READYD (0)

INT (O) 65 Interrupt request output. If the LEVEL/PULSE interrupt bit (bit 3) of Configuration Register #2 is low, a negative pulse of

approximately 500 ns in width is output on INT. If bit 3 is high, a low level interrupt request output will be asser ted on INT.

DTREQ (O)

/16/8 (I)

DTGRT(I)

/MSB/LSB (I)

MEMENA-OUT (O) 28 Memory Enable Output. Asser ted low during both host processor and 1553 protocol/memor y management memor y

transfer cycles. Used as a memor y chip select (CS) signal for exter nal RAM in the transparent mode.

MEMOE (O)/

ADDR_LAT (I)

MEMWR (O)

/ZERO_WAIT (I)

RD/WR (1)

Used to select between the Transparent/ DMA mode (when strapped to logic 1) and the Buffered mode (when strapped

to logic 0) for the host processor interface.

IOEN (0)

Handshake output to host processor. For a nonzero wait state read access, signals that data ia available to be read on

D15 through D0. For a nonzero wait state write cycle, signals the completion of data transfer to a register or RAM loca-

tion In the buffered zero wait state mode, active high output signal (following the rising edge of STRBD ) used to indi-

cate the latching of address and data (write only) and that an inter nal transfer between the address/data latches and the

RAM/registers is on-going.

Data Transfer Grant or Most Significant Byte/Least Significant Byte. In transparent mode, active low input signal assert-

ed, in response to the DTREQ output, to indicate that access to the processor buses has been granted to the BU-

65170/61580. In 8-bit buffered mode, input signal used to indicate which byte is being transferred (MSB or LSB).The

POLARITY_SEL input controls the logic sense of MSB/LSB. (Note: only the 8-bit buffered mode uses MSB/LSB.) See

description of POLARITY_SEL signal. N/C in 16-bit buffered mode.

DTACK (O)/

POLARITY_SEL (I)

Data Transfer Acknowledge or Polarity Select. In transparent mode, active low output signal used to indicate acceptance

of the processor interface bus in response to a data transfer grant (DTGRT).In 16-bit buffered mode (TRANSPARENT/

BUFFERED = logic 0 and 16/8 = logic 1), input signal used to control the logic sense of the RD/WR signal. When

POLARITY_SEL is logic 1, RD/WR must be asser ted high (logic 1) for a read operation and low (logic 0) for a write

operation.When POLARITY_SEL is logic 0, RD/WR must be asserted low (logic 0) for a read operation and high (logic

1) for a write operation.In 8-bit buffered mode (TRANSPARENT/BUFFERED = logic 0 and 16/8 = logic 0), input signal

used to control the logic sense of the MSB/LSB signal. When POLARITY_SEL is logic 0, MSB/LSB must be asser ted

low (logic 0) to indicate the transfer of the least significant byte and high (logic 1) to indicate the transfer of the most sig-

nificant byte.When POLARITY_SEL is logic 1, MSB/LSB must be asserted high (logic 1) to indicate the transfer of the

least significant byte and low (logic 0) to indicate the transfer of the most significant byte.

MEMENA-IN (I)

/TRIGGER_SEL (I)

Memory Enable Input or Trigger Select. In transparent mode, MEMENA-IN is an active low Chip Select (CS) input to the

4K x 16 of internal shared RAM. When only using inter nal RAM, connect directly to MEMENA-OUT. In 8-bit buffered

mode, the input signal (TRIGGER_SEL) indicates the order of byte pairs transfer to or from the BU-65170/61580 by the

host processor. This signal has no operation (can be N/C) in the 16-bit buffered mode.In the 8-bit buffered mode, TRIG-

GER_SEL should be asser ted high (logic 1) if the byte order for both read operations and wr ite operations is MSB fol-

lowed by LSB.TRIGGER_SEL should be asserted low (logic 0) if the byte order for both read operations and write oper-

ations is LSB followed by MSB.

Memory Output Enable or Address Latch. In transparent mode, MEMOE output will be used to enable data outputs for

external RAM read cycles (normally connected to the OE signal on external RAM chips). In buffered mode, ADDR_LAT

input will be used to configure the internal address latches in latched mode (when low) or transparent mode (when high).

Memory Write or Zero Wait State. In transparent mode, active low output signal (MEMWR ) will be asser ted low during

memory wr ite transfers to strobe data into internal or external RAM (normally connected to the WR signal on external

RAM chips). In buffered mode, input signal (ZERO_WAIT) will be used to select between the zero wait mode

(ZERO_WAIT = logic 0) and the nonzero wait mode (ZERO_WAIT = logic 1).

Data Transfer Request or 16-bit/8-bit Transfer Mode Select. In transparent mode, active low output signal used to request

access to the processor interface bus (address,data, and control buses). In buffered mode, input signal used to select

between the 16-bit data transfer mode (16/8 = logic 1) and the 8 bit data transfer mode (16/8 = logic 0).

Read/Write. For host processor access, selects either reading or writing. In the 16-bit buffered mode, if polarity select is

logic ), then RD/WR is low (logic 0 ) for read accesses and high (logic 1 ) for write accesses. If polar ity select is logic 1

or the configuration of the interface is a mode other than 16-bit buffered mode, then RD/WR is high (logic 1 ) for read

accesses and low (logic 0 ) for wr ite accesses.

TABLE 33. SIGNAL DESCRIPTIONS FOR BU-65170/61571, BU-61580/61585, BU-61586

(G, S or V PACKAGE)

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TABLE 33. SIGNAL DESCRIPTIONS FOR BU-65170/61571, BU-61580/61585, BU-61586

(G, S or V PACKAGE) (CONTINUED)

MISCELLANEOUS (7)

Option for BU-65170/61580X6 and the BU-61585X6. Inhibits (disables) the respective (A/B) MIL-STD-1553 transmitter

when asser ted to logic “1.”

70TX_INH_A (I)

External Time Tag Clock input. Use may be designated by bits 7, 8, and 9 of Configuration Register #2. When used it incre-

ments the internal Time Tag Register/Counter. If not used, should be connected to +5V or ground.

TAG_CLK (I)

SSFLAG(I)/

EXT_TRIG (I)

INCMD (O)

Master Clear. Negative true Reset input, normally asserted low following power turn-on. Requires a minimum 100ns nega-

tive pulse to reset all internal logic to its “power tur n-on”state.

MSTCLR (I)

16MHz (or 12MHz) clock input.19CLOCK IN (I)

DESCRIPTIONPINSIGNAL NAME

In Command. In BC mode, asser ted low throughout processing cycle for each message. In RT mode or Message Monitor

mode, asserted low following receipt of Command Word and kept low until completion of current message sequence. In

Word Monitor mode, goes low following MONITOR START command, kept low while monitor is on-line, goes high following

RESET command.

Subsystem Flag or External Tr igger input. In the Remote Terminal mode, asser ting this input , will set the Subsystem Flag

bit in the BU-65170/61580's RT Status Word. A low on the SSFLAG input overrides a logic “1" of the respective bit (bit 8) of

Configuration Register #1. In the Bus Controller mode, an enabled exter nal BC Star t option (bit 7 of Configuration Register

#1) and a low-to-high transition on this input will issue a BC Start command, star ting execution of the current BC frame. In

the Word Monitor mode, an enabled external tr igger (bit 7 of Configuration Register #1) and a low-to-high transition on this

input will issue a monitor trigger.

TX_INH_B (I)

POWER AND GROUND (8)

-15(-12)VB

CH. B Transceiver Ground37GNDB

CH. B +5V Supply38

CH. B -15V(-12V) Supply*36

+5VB

CH. A Transceiver Ground69GNDA

CH. A +5V Supply68+5VA

CH. A -15V(-12V) Supply*70-15(-12)VA

Logic Ground18LOGIC GND

Logic +5V Supply54+5V LOGIC

DESCRIPTIONPINSIGNAL NAME

RT ADDRESS (6)

RTADP (I) 44

39RTAD0 (LSB) (I)

40RTAD1 (I)

Remote Terminal Address Inputs

41RTAD2 (I)

42RTAD3 (I)

43RTAD4 (MSB) (I)

DESCRIPTIONPINSIGNAL NAME

1553 ISOLATION TRANSFORMER INTERFACE (4)

Analog Transmit/Receive Input/Outputs. Connect directly to 1553 isolation transformers.

35TX/RX-B (I/O)

34TX/RX-B (I/O)

2TX/RX-A (I/O)

1TX/RX-A (I/O)

DESCRIPTIONPINSIGNAL NAME

NOTE: * No Connects (N/Cs) for BU-65170/61580 and TX_INH input for BU-65170/61580X6.

Remote Terminal Address Parity. Must provide odd parity sum with RTAD4-RTAD0 in order for the RT to respond to non-

broadcast commands.

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TABLE 33. SIGNAL DESCRIPTIONS FOR BU-65170/61571, BU-61580/61585, BU-61586

(G, S or V PACKAGE) (CONTINUED)

ADDRESS BUS (16)

A04

A10

16-bit bidirectional address bus. In both the buffered and transparent modes, the host CPU accesses the BU-65170/61580

registers and 4K words of internal RAM by A11 through A0 (BU-61585 uses A13 through A0).The host CPU performs register

selection by A4 through A0.In the buffered mode, A15-A0 are inputs only. In the transparent mode, A15-A0 are inputs during

CPU accesses and drive outward (towards the CPU) when the 1553 protocol/memor y management logic accesses up to 64K

x 16 of external RAM.The address bus dr ives outward only in the transparent when the signal DTACK is low (indicating that

the 61580 has control of the processor interface bus) and IOEN is high (indicating that this is not a CPU access). Most of the

time, including immediately after power tur n-on RESET, the A15-A0 outputs will be in their disabled (high impedance) state.

A00

A05

A11

A01

A06

A12

A02

A07

A13

A03

A08

A14

A09

A15 (MSB)

DESCRIPTION

16-bit bidirectional data bus.This bus interfaces the host processor to the internal registers and 4K words of RAM(12K of

RAM for the BU-61585). In addition, in the transparent mode, this bus allows data transfers to take place between the

internal protocol/memor y management logic and up to 64K x 16 of external RAM. Most of the time, the outputs for D15

through D0 are in their high impedance state.They drive outward in the buffered or transparent mode when the host CPU

reads the internal RAM or registers. Or, in the transparent mode, when the protocol/memory management logic is

accessing (either reading or writing) inter nal RAM or writing to external RAM.

D10

D00

47D01

48D02

49D03

D04 50

51D05

52D06

53D07

55D08 56

D09

58D11

59D12

60D13

61D14

62D15 (MSB)

DATA BUS (16)

DESCRIPTIONPINSIGNAL NAME

SIGNAL NAME PIN

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TX/RX-B -VA (see note)

TX/RX-B GNDA34 69

+5VA33 68

DTACK/POLARITY_SEL IOEN32 67

DTREQ/16/8 READYD31 66

MEMWR/ZERO_WAIT INT30 65

MEMOE/ADDR_LAT TRANSPARENT/BUFFERED29 64

MEMENA_OUT TAG_CLK28 63

SSFLAG/EXT_TRIG D1527 62

DTGRT/MSB/LSB D1426 61

A00 D1325 60

A01 D1224 59

A02 D1123 58

A03 D1022 57

A04 D0921 56

A05 D0820 55

CLK +5V Logic19 54

GND D0718 53

A06 D0617 52

A07 D0516 51

D04A0815 50

A09 D0314 49

A10 D0213 48

A11 D0112 47

A12 D0011 46

A13 INCMD10 45

A14 RTADP9 44

A15 RTAD4843

MSTCLR RTAD3742

RD/WR RTAD2641

MEM/REG RTAD1540

STRBD RTAD0439

SELECT +5VB3 38

TX/RX-A GNDB237

TX/RX-A -VB (see note)136

NAME NAMEPIN

35 70

Notes:

-15V for BU-65170/61580X1.

-12V for BU-65170/61580X2.

N/C for BU-65170/61580X3.

For BU-65170/61580X6.

pin 36 is TX_INH_B

pin 70 is TX_INH_A

MEMENA_IN/TRIGGER_SEL

TABLE 34. BU-65170/65171, BU-61580/61581/61585/61586

PIN LISTINGS

(G, S or V PACKAGE)

Data Device Cor poration

www.ddc-web.com BU-65170/61580/61585

H1 web-09/02-0

FIGURE 19. BU-65170/65171/61580/61581/61585/61586S MECHANICAL OUTLINE

1.000 MAX

(25.4)

0.400

(10.16)

1.700 (43.18) INDEX

DENOTES

PIN 1

0.215 (5.46) MAX FOR "D" PACKAGE

0.165 (4.19) MAX FOR "S" PACKAGE

NOTES:

1. DIMENSIONS ARE IN INCHES (MILLIMETERS).

2. PACKAGE MATERIAL: ALUMINA (AL2O3).

3. LEAD MATERIAL: KOVAR, PLATED BY 150µ MINIMUM NICKEL, PLATED BY 50µ MINIMUM GOLD.

1.900 MAX

(48.26)

0.180 ±0.010 TYP

(4.57 ±0.25)

0.100 (2.54)

0.100 (2.54) TYP

0.050 (1.27) TYP

0.600

(15.24)

0.018 ±0.002 DIA TYP

(0.46 ±0.05)

37 69

TOP VIEW

BOTTOM VIEW

INDEX

DENOTES

PIN 1

1.900 (48.26) MAX

SIDE VIEW

Data Device Cor poration

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H1 web-09/02-0

FIGURE 20. BU-65170/65171/61580/61581/61585/61586V MECHANICAL OUTLINE

70 36

351

0.018 ± 0.002 TYP

(0.46 ± 0.05)

1.900 MAX

(48.26)

34 EQ SP @ 0.050 = 1.700

(43.18) (1.27) TOL NONCUM

0.050 TYP

(1.27)

0.400 MIN TYP

(10.18)

INDEX DENOTES PIN 1 1.000 MAX

(25.4)

0.215 (5.46) MAX

For "F" Package

0.150 (3.81) MAX

For "V" Package

0.010 ± 0.002 TYP

(0.254 ± 0.051)

0.070 ± 0.010

(1.78)

PIN NUMBERS

FOR REF ONLY

TOP VIEW SIDE VIEW

NOTES:

1. DIMENSIONS ARE IN INCHES (MILLIMETERS).

2. PACKAGE MATERIAL: ALUMINA (AL2O3).

3. LEAD MATERIAL: KOVAR, PLATED BY 150µ MINIMUM NICKEL, PLATED BY 50µ MINIMUM GOLD.

Data Device Cor poration

www.ddc-web.com BU-65170/61580/61585

H1 web-09/02-0

FIGURE 21. BU-65170/65171/61580/61581/61585/61586G MECHANICAL OUTLINE

3635

1.000 (MAX)

1.900 MAX

0.018 ±0.002

PIN 1 DENOTED BY

INDEX MARK

0.050 TYP

34 EQ. SP. @

0.050 = 1.700

(TOL. NONCUM)

PIN NUMBERS ARE

FOR REF. ONLY

0.080 MIN

0.190 ±0.010

0.040 TYP

0.050 MIN

0.012 MAX 1.024 MAX

1.38 ±0.02

0.065 (REF)

0.010 ±0.002

0.150 MAX

VIEW "A"

0.006 -0.004,+0.010

(0.152 +0.10,-0.254)

Data Device Cor poration

www.ddc-web.com BU-65170/61580/61585

H1 web-09/02-0

ORDERING INFORMATION

BU-XXXXXXX-XXXX

Supplemental Process Requirements:

S = Pre-Cap Source Inspection

L = Pull Test

Q = Pull Test and Pre-Cap Inspection

K = One Lot Date Code

W = One Lot Date Code and PreCap Source

Y = One Lot Date Code and 100% Pull Test

Z = One Lot Date Code, PreCap Source and 100% Pull Test

Blank = None of the Above

Test Criteria:

0 = Standard Testing

2 = MIL-STD-1760 Amplitude Compliant - Applies to +5 Volt Transceiver Option Only

Process Requirements:

0 = Standard DDC practices, no Burn-In (See following page.)

1 = MIL-PRF-38534 Compliant

2 = B*

3 = MIL-PRF-38534 Compliant with PIND Testing

4 = MIL-PRF-38534 Compliant with Solder Dip

5 = MIL-PRF-38534 Compliant with PIND Testing and Solder Dip

6 = B* with PIND Testing

7 = B* with Solder Dip

8 = B* with PIND Testing and Solder Dip

9 = Standard DDC Processing with Solder Dip, no Bur n-In (See following page.)

Temperature Range/Data Requirements:

1 = -55°C to +125°C

2 = -40°C to +85°C

3 = 0°C to +70°C

4 = -55°C to +125°C with Variables Test Data

5 = -40°C to +85°C with Variables Test Data

8 = 0°C to +70°C with Variables Test Data

Voltage/Transceiver Option:

0 = Transceiverless

1 = +5 Volts and -15 Volts (1760 Compliant - Standard Configuration)

2 = +5 Volts and -12 Volts

3 = +5 Volts, rise/fall times=100 to 300 ns (-1553B)(See Test Criteria - 1760 Compliant with option -XX2)

5 = +5/+15/-15V Sinusoidal (McAir)

6 = +5 Volts only with TX Inhibit inputs brought out on negative supply pins

Package T ype:

G = “Gull Wing”(Formed Lead)

J = J Lead (Solder DIP not available )

P = PGA

S = Small DIP

V = Ver y Small Flat Pack

Product T ype:

65170 = 70-pin RT

65171 = 70-pin RT with Latchable RT Address Option

61580 = 70-pin BC/RT/MT

61581 = 70-pin BC/RT/MT with Latchable RT address Option

61585 = 70-pin BC/RT/MT 8K x 17 with RAM

61586 = 70-pin BC/RT/MT 8K x 17 with RAM and RT Address Option

Note:The ACE series is also available to DESC drawing number 5962-93065.

*Standard DDC Processing with burn-in and full temperature test, see table on following page.

STANDARD DDC PROCESSING

TEST MIL-STD-883

METHOD(S) CONDITION(S)

INSPECTION 2009, 2010, 2017, and 2032 —

SEAL 1014 A and C

TEMPERATURE CYCLE 1010 C

CONSTANT ACCELERATION 2001 A

BURN-IN 1015, Table 1 —

PRINTED IN THE U.S.A.

DATA DEVICE CORPORATION

REGISTERED TO ISO 9001

FILE NO. A5976

H1 web-09/02-0

105 Wilbur Place, Bohemia, New York, U.S.A. 11716-2482

For Technical Support - 1-800-DDC-5757 ext. 7234

Headquarters, N.Y., U.S.A. - Tel: (631) 567-5600, Fax: (631) 567-7358

Southeast, U.S.A. - Tel: (703) 450-7900, Fax: (703) 450-6610

West Coast, U.S.A. - Tel: (714) 895-9777, Fax: (714) 895-4988

United Kingdom - Tel: +44-(0)1635-811140, Fax: +44-(0)1635-32264

Ireland - Tel: +353-21-341065, Fax: +353-21-341568

France - Tel: +33-(0)1-41-16-3424, Fax: +33-(0)1-41-16-3425

Germany - Tel: +49-(0)8141-349-087, Fax: +49-(0)8141-349-089

Japan - Tel: +81-(0)3-3814-7688, Fax: +81-(0)3-3814-7689

W orld Wide W eb - http://www.d dc-web.com

The information in this data sheet is believed to be accurate; however, no responsibility is

assumed by Data Device Cor poration for its use, and no license or rights are

granted by implication or otherwise in connection therewith.

Specifications are subject to change without notice.