CY7C025AV-25AC Cypress Semiconductor Corp, CY7C025AV-25AC Datasheet - Page 13

• Manufacturer Part Number: CY7C025AV-25AC
• Description: IC,SRAM,8KX16,CMOS,QFP,100PIN,PLASTIC
• Manufacturer: Cypress Semiconductor Corp

Document #: 38-06052 Rev. *H
Switching Waveforms
Timing Diagram of Semaphore Contention
Semaphore Read After Write Timing, Either Side
Notes:
42. CE = HIGH for the duration of the above timing (both write and read cycle).
43. I/O
44. Semaphores are reset (available to both ports) at cycle start.
45. If t
A
A
A
0R
0L
0
SPS
0R
SEM
SEM
SEM
–A
R/W
I/O
R/W
R/W
–A
–A
OE
= I/O
is violated, the semaphore will definitely be obtained by one side or the other, but which side will get the semaphore is unpredictable.
2
2L
2R
0
R
L
L
R
0L
= LOW (request semaphore); CE
t
SA
(continued)
VALID ADRESS
t
AW
WRITE CYCLE
t
t
PWE
SCE
R
= CE
t
SD
DATA
t
MATCH
SPS
MATCH
[43, 44, 45]
L
= HIGH.
t
IN
HA
VALID
[42]
t
HD
t
SWRD
t
SOP
t
SOP
READ CYCLE
t
SAA
CY7C0241AV/0251AV/036AV
VALID ADRESS
t
DOE
CY7C024AV/025AV/026AV
t
ACE
DATA
OUT
VALID
t
OHA
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