CY7C1325
6
Cycle Description Table[1, 2, 3]
Cycle Description
ADD
Used
CE1
CE3
CE2
ZZ
ADSP
ADSC
ADV
WE
OE
CLK
DQ
Deselected Cycle, Power-down
None
H
X
X
L
X
L
X
X
X
L-H
High-Z
Deselected Cycle, Power-down
None
L
X
L
L
L
X
X
X
X
L-H
High-Z
Deselected Cycle, Power-down
None
L
H
X
L
L
X
X
X
X
L-H
High-Z
Deselected Cycle, Power-down
None
L
X
L
L
H
L
X
X
X
L-H
High-Z
Deselected Cycle, Power-down
None
X
X
X
L
H
L
X
X
X
L-H
High-Z
SNOOZE MODE, Power-Down
None
X
X
X
H
X
X
X
X
X
X
High-Z
READ Cycle, Begin Burst
External
L
L
H
L
L
X
X
X
L
L-H
Q
READ Cycle, Begin Burst
External
L
L
H
L
L
X
X
X
H
L-H
High-Z
WRITE Cycle, Begin Burst
External
L
L
H
L
H
L
X
L
X
L-H
D
READ Cycle, Begin Burst
External
L
L
H
L
H
L
X
H
L
L-H
Q
READ Cycle, Begin Burst
External
L
L
H
L
H
L
X
H
H
L-H
High-Z
READ Cycle, Continue Burst
Next
X
X
X
L
H
H
L
H
L
L-H
Q
READ Cycle, Continue Burst
Next
X
X
X
L
H
H
L
H
H
L-H
High-Z
READ Cycle, Continue Burst
Next
H
X
X
L
X
H
L
H
L
L-H
Q
READ Cycle, Continue Burst
Next
H
X
X
L
X
H
L
H
H
L-H
High-Z
WRITE Cycle, Continue Burst
Next
X
X
X
L
H
H
L
L
X
L-H
D
WRITE Cycle, Continue Burst
Next
H
X
X
L
X
H
L
L
X
L-H
D
READ Cycle, Suspend Burst
Current
X
X
X
L
H
H
H
H
L
L-H
Q
READ Cycle, Suspend Burst
Current
X
X
X
L
H
H
H
H
H
L-H
High-Z
READ Cycle, Suspend Burst
Current
H
X
X
L
X
H
H
H
L
L-H
Q
READ Cycle, Suspend Burst
Current
H
X
X
L
X
H
H
H
H
L-H
High-Z
WRITE Cycle, Suspend Burst
Current
X
X
X
L
H
H
H
L
X
L-H
D
WRITE Cycle, Suspend Burst
Current
H
X
X
L
X
H
H
L
X
L-H
D
Notes:
1.
X=”Don't Care,” 1=Logic HIGH, 0=Logic LOW.
2.
The SRAM always initiates a read cycle when ADSP asserted, regardless of the state of GW, BWE, or BWS[1:0]. Writes may occur only on subsequent clocks
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.
3.
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.
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