CY7C1338B
Document #: 38-05143 Rev. **
Page 6 of 18
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[3:0]. 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.
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
