Switching waveforms – Cypress CY7C1245V18 User Manual
Page 24
CY7C1241V18, CY7C1256V18
CY7C1243V18, CY7C1245V18
Document Number: 001-06365 Rev. *D
Page 24 of 28
Switching Waveforms
Figure 4. Read/Write/Deselect Sequence waveform for 2.0 Cycle Read Latency
tKH
tKL
tCYC
tKHKH
NOP
READ
NOP
WRITE
READ
WRITE
1
2
3
4
5
6
7
8
t
t
t
tSA HA
SC
HC
tHD
tSC tHC
A0
A1
A2
A3
t
t
SD
HD
t SD
D11
D10
D12
D13
D30
D31
D32
D33
D
A
WPS
RPS
K
K
DON’T CARE
UNDEFINED
CQ
CQ
tCQOH
CCQO
t
tCQOH
CCQO
t
tQVLD
QVLD
tQVLD
(Read Latency = 2.0 Cycles)
CLZ
t
t
CO
tDOH
tCQDOH
CQD
t
tCHZ
Q00
Q01
Q20
Q02
Q21
Q03
Q22
Q23
tCQH
t
CQHCQH
Q
Notes
30. Q00 refers to output from address A0. Q01 refers to output from the next internal burst address following A0, that is, A0+1.
31. Outputs are disabled (High-Z) one clock cycle after a NOP.
32. In this example, if address A2 = A1, then data Q20 = D10 and Q21 = D11. Write data is forwarded immediately as read results. This note applies to the whole
diagram.