CY7C1354C CYPRESS [Cypress Semiconductor], CY7C1354C Datasheet - Page 7

• Manufacturer Part Number: CY7C1354C
• Manufacturer: CYPRESS [Cypress Semiconductor]

Document #: 38-05538 Rev. *G
Pin Definitions
Functional Overview
The CY7C1354C and CY7C1356C are synchronous-pipelined
Burst NoBL SRAMs designed specifically to eliminate wait
states during Write/Read transitions. All synchronous inputs
pass through input registers controlled by the rising edge of
the clock. The clock signal is qualified with the Clock Enable
input signal (CEN). If CEN is HIGH, the clock signal is not
recognized and all internal states are maintained. All
synchronous operations are qualified with CEN. All data
outputs pass through output registers controlled by the rising
edge of the clock. Maximum access delay from the clock rise
(t
Accesses can be initiated by asserting all three Chip Enables
(CE
Enable (CEN) is active LOW and ADV/LD is asserted LOW,
the address presented to the device will be latched. The
access can either be a Read or Write operation, depending on
the status of the Write Enable (WE). BW
conduct Byte Write operations.
Write operations are qualified by the Write Enable (WE). All
Writes are simplified with on-chip synchronous self-timed
Write circuitry.
Three synchronous Chip Enables (CE
asynchronous Output Enable (OE) simplify depth expansion.
All operations (Reads, Writes, and Deselects) are pipelined.
ADV/LD should be driven LOW once the device has been
deselected in order to load a new address for the next
operation.
Single Read Accesses
A read access is initiated when the following conditions are
satisfied at clock rise: (1) CEN is asserted LOW, (2) CE
and CE
signal WE is deasserted HIGH, and (4) ADV/LD is asserted
LOW. The address presented to the address inputs is latched
into the address register and presented to the memory core
and control logic. The control logic determines that a read
access is in progress and allows the requested data to
propagate to the input of the output register. At the rising edge
of the next clock the requested data is allowed to propagate
through the output register and onto the data bus within 2.8 ns
(250-MHz device) provided OE is active LOW. After the first
clock of the read access the output buffers are controlled by
OE and the internal control logic. OE must be driven LOW in
order for the device to drive out the requested data. During the
second clock, a subsequent operation (Read/Write/Deselect)
can be initiated. Deselecting the device is also pipelined.
Therefore, when the SRAM is deselected at clock rise by one
of the chip enable signals, its output will tri-state following the
next clock rise.
NC
NC (18, 36,
72, 144, 288,
576, 1G)
ZZ
CO
Pin Name
1
) is 2.8 ns (250-MHz device).
, CE
3
2
are ALL asserted active, (3) the Write Enable input
, CE
3
) active at the rising edge of the clock. If Clock
Asynchronous
I/O Type
Input-
(continued)
–
–
No connects. This pin is not connected to the die.
These pins are not connected. They will be used for expansion to the 18M, 36M, 72M, 144M
288M, 576M and 1G densities.
ZZ “sleep” Input. This active HIGH input places the device in a non-time-critical “sleep”
condition with data integrity preserved. For normal operation, this pin has to be LOW or left
floating. ZZ pin has an internal pull-down.
1
, CE
[d:a]
2
can be used to
, CE
3
) and an
1
, CE
2
,
Burst Read Accesses
The CY7C1354C and CY7C1356C have an on-chip burst
counter that allows the user the ability to supply a single
address and conduct up to four Reads without reasserting the
address inputs. ADV/LD must be driven LOW in order to load
a new address into the SRAM, as described in the Single Read
Access section above. The sequence of the burst counter is
determined by the MODE input signal. A LOW input on MODE
selects a linear burst mode, a HIGH selects an interleaved
burst sequence. Both burst counters use A0 and A1 in the
burst sequence, and will wrap around when incremented suffi-
ciently. A HIGH input on ADV/LD will increment the internal
burst counter regardless of the state of chip enables inputs or
WE. WE is latched at the beginning of a burst cycle. Therefore,
the type of access (Read or Write) is maintained throughout
the burst sequence.
Single Write Accesses
Write access are initiated when the following conditions are
satisfied at clock rise: (1) CEN is asserted LOW, (2) CE
and CE
is asserted LOW. The address presented to A
into the Address Register. The write signals are latched into
the Control Logic block.
On the subsequent clock rise the data lines are automatically
tri-stated regardless of the state of the OE input signal. This
allows the external logic to present the data on DQ
(DQ
CY7C1356C). In addition, the address for the subsequent
access (Read/Write/Deselect) is latched into the address
register (provided the appropriate control signals are
asserted).
On the next clock rise the data presented to DQ
(DQ
CY7C1356C) (or a subset for byte write operations, see Write
Cycle Description table for details) inputs is latched into the
device and the Write is complete.
The data written during the Write operation is controlled by BW
(BW
signals. The CY7C1354C/CY7C1356C provides Byte Write
capability that is described in the Write Cycle Description table.
Asserting the Write Enable input (WE) with the selected Byte
Write Select (BW) input will selectively write to only the desired
bytes. 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. Byte Write
capability has been included in order to greatly simplify
Read/Modify/Write sequences, which can be reduced to
simple Byte Write operations.
a,b,c,d
a,b,c,d
a,b,c,d
Pin Description
3
are ALL asserted active, and (3) the Write signal WE
/DQP
/DQP
for CY7C1354C and BW
a,b,c,d
a,b,c,d
for CY7C1354C and DQ
for CY7C1354C and DQ
a,b
CY7C1354C
CY7C1356C
for CY7C1356C)
0
–A
a,b
a,b
Page 7 of 28
16
/DQP
/DQP
is loaded
and DQP
and DQP
1
a,b
a,b
, CE
for
for
2
,
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