11 / 19 page
CY7C024AV/024BV/025AV/026AV
CY7C0241AV/0251AV/036AV
Document #: 38-06052 Rev. *J
Page 11 of 19
Switching Waveforms
Notes
29. R/W is HIGH for read cycles.
30. Device is continuously selected CE = VIL and UB or LB = VIL. This waveform cannot be used for semaphore reads.
31. OE = VIL.
32. Address valid prior to or coincident with CE transition LOW.
33. To access RAM, CE = VIL, UB or LB = VIL, SEM = VIH. To access semaphore, CE = VIH, SEM = VIL.
tRC
tAA
tOHA
DATA VALID
PREVIOUS DATA VALID
DATA OUT
ADDRESS
tOHA
Figure 5. Read Cycle No. 1 (Either Port Address Access)[29, 30, 31]
tACE
tLZOE
tDOE
tHZOE
tHZCE
DATA VALID
tLZCE
tPU
tPD
ISB
ICC
DATA OUT
OE
CE and
LB or UB
CURRENT
Figure 6. Read Cycle No. 2 (Either Port CE/OE Access)[29, 32, 33]
UB or LB
DATA OUT
tRC
ADDRESS
tAA
tOHA
CE
tLZCE
tABE
tHZCE
tHZCE
tACE
tLZCE
Figure 7. Read Cycle No. 3 (Either Port)[29, 31, 32, 33]
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