CY7C008/009
CY7C018/019
Switching Waveforms
Read Cycle No. 1 (Either Port Address Access)
t
RC
ADDRESS
t
OHA
DATA OUT
t
AA
DATA VALID
t
OHA
PREVIOUS DATA VALID
Read Cycle No. 2 (Either Port CE/OE Access)
CE
t
ACE
t
HZCE
OE
t
LZOE
DATA OUT
t
LZCE
t
PU
I
CC
CURRENT
I
SB
t
PD
DATA VALID
t
DOE
t
HZOE
Read Cycle No. 3 (Either Port)
t
RC
ADDRESS
t
AA
t
OHA
t
LZCE
t
ABE
CE
t
ACE
t
LZCE
DATA OUT
t
HZCE
Notes:
22. R/W is HIGH for read cycles.
23. Device is continuously selected CE = V
IL
. This waveform cannot be used for semaphore reads.
24. OE = V
IL
.
25. Address valid prior to or coincident with CE transition LOW.
26. To access RAM, CE = V
IL
, SEM = V
IH
. To access semaphore, CE = V
IH
, SEM = V
IL
.
Document #: 38-06041 Rev. *C
Page 9 of 19
CYPRESS [ CYPRESS SEMICONDUCTOR ]
