Switching waveforms, Read/write/deselect sequence – Cypress CY7C1157V18 User Manual
Page 23
CY7C1146V18, CY7C1157V18
CY7C1148V18, CY7C1150V18
Document Number: 001-06621 Rev. *D
Page 23 of 27
Switching Waveforms
Read/Write/Deselect Sequence
Figure 7. Waveform for 2.0 Cycle Read Latency
DON’T CARE
UNDEFINED
1
2
3
4
5
6
7
8
9
10
READ
READ
READ
NOP
WRITE
WRITE
t
NOP
11
K
K
LD
R/W
A
tKH tKL
tCYC
tHC
tSA tHA
SC
A0
A1
A2
A3
A4
CQ
CQ
QVLD
QVLD
t
NOP
t
QVLD
t
tCCQO
tCQOH
t
tCQOH
QVLD
t
NOP
DQ
KHKH
12
(Read Latency = 2.0 Cycles)
NOP
NOP
CCQO
tSD
HD
tSD
tHD
t
CLZ
tCHZ
D20 D21
D30
D31
t
CQDOH
Q00
Q11
Q01 Q10
tDOH
tCO
Q40 Q41
tCQD
t
t
tCQH
CQHCQH
Notes
29. Q00 refers to output from address A0. Q01 refers to output from the next internal burst address following A0, i.e., A0 + 1.
30. Outputs are disabled (High-Z) one clock cycle after a NOP.
31. The third NOP cycle between Read to Write transition is not necessary for correct device operation when Read Latency = 2.0 cycles; however at high frequency
operation, it may be required to avoid bus contention.