CY7C1325-50AC CYPRESS [Cypress Semiconductor], CY7C1325-50AC Datasheet - Page 6

• Manufacturer Part Number: CY7C1325-50AC
• Description: 256K x 18 Synchronous 3.3V Cache RAM
• Manufacturer: CYPRESS [Cypress Semiconductor]

Cycle Description Table
Deselected Cycle, Power-down
Deselected Cycle, Power-down
Deselected Cycle, Power-down
Deselected Cycle, Power-down
Deselected Cycle, Power-down
SNOOZE MODE, Power-Down
READ Cycle, Begin Burst
READ Cycle, Begin Burst
WRITE Cycle, Begin Burst
READ Cycle, Begin Burst
READ Cycle, Begin Burst
READ Cycle, Continue Burst
READ Cycle, Continue Burst
READ Cycle, Continue Burst
READ Cycle, Continue Burst
WRITE Cycle, Continue Burst
WRITE Cycle, Continue Burst
READ Cycle, Suspend Burst
READ Cycle, Suspend Burst
READ Cycle, Suspend Burst
READ Cycle, Suspend Burst
WRITE Cycle, Suspend Burst
WRITE Cycle, Suspend Burst
Notes:
1.
2.
3.
X=”Don't Care,” 1=Logic HIGH, 0=Logic LOW.
The SRAM always initiates a read cycle when ADSP asserted, regardless of the state of GW, BWE, or BWS
after the ADSP or with the assertion of ADSC. As a result, OE must be driven HIGH prior to the start of the write cycle to allow the outputs to three-state. OE
is a “don't care” for the remainder of the write cycle.
OE is asynchronous and is not sampled with the clock rise. During a read cycle DQ=High-Z when OE is inactive, and DQ=data when OE is active.
Cycle Description
[1, 2, 3]
External
External
External
External
External
Current
Current
Current
Current
Current
Current
Used
None
None
None
None
None
None
ADD
Next
Next
Next
Next
Next
Next
CE
H
X
X
X
X
H
H
X
H
X
X
H
H
X
H
L
L
L
L
L
L
L
L
1
CE
X
X
H
X
X
X
X
X
X
X
X
X
L
L
L
L
L
X
X
X
X
X
X
3
CE
H
H
H
H
H
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
L
L
2
6
ZZ
H
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
ADSP
X
H
H
X
H
H
H
H
H
X
X
H
X
H
H
X
X
H
X
L
L
L
L
ADSC
X
X
X
X
X
H
H
H
H
H
H
H
H
H
H
H
H
L
L
L
L
L
L
[1:0]
ADV
. Writes may occur only on subsequent clocks
X
X
X
X
X
X
X
X
X
X
X
H
H
H
H
H
H
L
L
L
L
L
L
WE
X
X
X
X
X
X
X
X
H
H
H
H
H
H
H
H
H
H
L
L
L
L
L
OE
X
X
X
X
X
X
H
X
H
H
H
X
X
H
H
X
X
L
L
L
L
L
L
CY7C1325
CLK
L-H
L-H
L-H
L-H
L-H
L-H
L-H
L-H
L-H
L-H
L-H
L-H
L-H
L-H
L-H
L-H
L-H
L-H
L-H
L-H
L-H
L-H
X
High-Z
High-Z
High-Z
High-Z
High-Z
High-Z
Q
High-Z
D
Q
High-Z
Q
High-Z
Q
High-Z
D
D
Q
High-Z
Q
High-Z
D
D
DQ