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CY7C1347B
5
Introduction
Functional Overview
All synchrono us inp uts pass th rough inp ut regi sters con tr olle d
by the rising edge of the clock. All data outputs pass through
outpu t regist ers contr olled b y the rising ed ge of the clock. Max-
imum access delay from the clock rise (tCO) is 3.5 ns
(166-MHz device).
The CY7C1347B supports secondary ca che in systems utiliz-
ing either a linear or interleaved burst sequence. The inter-
lea ved burst o rder supports P en tium and i486 proces sors. Th e
linear burst sequence is suited for processors that utilize a
li near burst sequence. The burst order is user selectable, and
is determined b y sampling t he M ODE input. Acc esses can be
initiated with either the Processor Address Strobe (ADSP) or
the Cont roller Addres s Strobe (ADSC). Addres s adv ancement
through the burst sequence is contr olled by the ADV input. A
two- bit on-ch ip wrap around burst co unter captu res the f irst ad-
dress in a burst sequence and automatically increments the
address for t h e rest of t h e burst a ccess.
Byte write operations are qualified with the Byte Write Enable
(BWE) and Byte Write Select (BW[3:0]) inputs. A Global Wr ite
Enable (GW) overrides al l byte writ e inputs and writes data to
all four bytes. All writes are simplified with on-chip synchro-
nous self-timed wri te ci rcuitry.
Three synchronous Chip Selects (CE1, CE2, CE3) and an
asynchronous Output Enable (OE ) provide for easy bank se-
lection and output three-state control. ADSP is ignor ed if CE1
is HIGH.
Singl e Read Accesses
This access is initiated when the following conditions are sat-
isfied at clock rise: (1) ADSP or ADSC is asserted LOW, (2)
CE1, CE 2, CE3 ar e all ass erted act ive , and (3) the write s ignals
(GW, B W E) are all deasserted HIGH. ADSP is ignored if CE1
is HIGH. The address pre sented to the addr ess inputs (A[16:0])
is st ored in to the addr ess adv anc ement logi c and the Address
Register while being presented to the memory core. The cor-
responding data is allowed to propagate to the input of the
Output Regist ers. At the rising edge of the next clock the dat a
is al lowed to propagat e through t he Output Register and onto
the data bus within 3.5 ns (166-MHz device) if OE is active
LO W. The only e xcept ion occur s when the SRAM is emergin g
from a deselected state to a selected state, its outputs are
always three-stated during the first cycle of the access. After
the first cycle of the access, the outputs are controlled by the
OE signal. Consecutive single read cycles are supported.
Once t he SRAM is deselect ed at clock rise by the chip select
and either ADSP or ADSC signals, its output will three-state
immediately.
Singl e Writ e Accesses Initiated by ADSP
This access is initiated when both of the following conditions
are satisfied at clock rise: (1) ADSP is asserted LOW, and (2)
CE1, CE 2, CE3 a re all a sserted activ e. Th e addres s pr esente d
to A[16:0] is loaded into the Address Register and the address
advancement logic while being delivered to the RAM core. The
write signals (GW, BWE, and BW [3:0]) and ADV inputs are ig-
nored duri ng thi s first cycle.
ADSP-triggered write accesses require two clock cycles to
complete. If GW is ass erted LO W on the se cond clo ck rise , the
data pr esen ted to the DQ[31:0] and DP[3:0] inputs is writt en int o
the corr esponding address location in the RAM core. If G W is
HIGH, then the write operation is controlled by BWE and
BW[3:0] signals . The CY7C1347B provides b yte write capabi l-
ity that is described in t he Writ e Cycle Description table. As-
serting the Byte Write Enable input (BWE) with the selected
Byte Wr ite (BW[3:0]) input will selectively wr ite to only the de-
s ired by t e s.
Bytes not selected during a byte write operation will remain
unaltered. A synchronous self-timed write mechanism has
been provided to simplify the write operations.
Because the CY7C1347B is a commo n I/ O de vice , the Outpu t
Enabl e (OE) must be d easserted HIGH b efore presentin g data
to the DQ[31:0] and DP[3:0] i nputs . Doing so will th ree-st ate the
output driv ers. As a saf et y precaut ion, DQ[31:0] and DP[3:0] are
automati cally three-stated whenever a write cycle is detec ted,
regardless of the state of OE.
Single Write Accesses Initiated by ADSC
ADSC write accesses are initiated when the following condi-
tions are satisfied: (1) ADSC is asserted LOW, (2) ADSP is
deasserted HIGH, (3) CE1, CE2, C E3 are all asserted active,
and (4) the appropriate combinat ion of t he write inputs (GW,
BWE, and BW[3:0]) are asserted active to conduct a write to
the desired byte(s). ADSC-tr iggered write accesses require a
single clock cycle to complete. The address presented to
A[16:0] is loaded into the address regi ster and the address ad-
vancement logic whi le being delivered to the RAM core. The
ADV input is ignored during this cycle. If a global write is con-
ducted, the data presented to the DQ[31:0] and DP[3:0] is written
into the corresponding address location in the RAM core. If a
byte write is conducted, only the selected bytes are written.
Bytes not selected during a byte write operation will remain
unaltered. A synchronous self-timed write mechanism has
been provided to simplify the write operations.
Because the CY7C1347B is a commo n I/ O de vice , the Outpu t
Enabl e (OE) must be d easserted HIGH b efore presentin g data
to the DQ[31:0] and DP[3:0] i nputs . Doing so will th ree-st ate the
output driv ers. As a saf et y precaut ion, DQ[31:0] and DP[3:0] are
automati cally three-stated whenever a write cycle is detec ted,
regardless of the state of OE.
Burst Sequences
The CY7C1347B provides a two- bit wraparound counter, fed
by A[1:0], that implements either an interleaved or linear burst
sequence . The inte rleaved b urst s equence i s design ed s pecif -
ically to support Intel Pentium applications. The linear burst
sequence is designed to suppor t processors that follow a lin-
ear burst sequence. The burst sequence is user-selectable
through the MODE input.
Asser ting ADV LOW at clock rise will automatically inc rement
the burst counter to the next address in the burst sequence.
Both read and write burst operations are supported.