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CY7C026A-15AXI

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24
CY7C026A
Document Number: 38-06046 Rev. *J Page 16 of 24
Figure 8. Semaphore Read After Write Timing, Either Side
[32]
Figure 9. Timing Diagram of Semaphore Contention
[33, 34, 35]
Switching Waveforms (continued)
t
SOP
t
SAA
VALID ADRESS VALID ADRESS
t
HD
DATA
IN
VALID
DATA
OUT
VALID
t
OHA
t
AW
t
HA
t
ACE
t
SOP
t
SCE
t
SD
t
SA
t
PWE
t
SWRD
t
DOE
WRITE CYCLE READ CYCLE
OE
R/W
I/O
0
SEM
A
0
–A
2
ADDRESS MATCH
t
SPS
ADDRESS MATCH
R/W
L
SEM
L
R/W
R
SEM
R
A
0L
–A
2L
A
0R
–A
2R
Notes
32. CE
= HIGH for the duration of the above timing (both write and read cycle).
33. I/O
0R
= I/O
0L
= LOW (request semaphore); CE
R
= CE
L
= HIGH.
34. Semaphores are reset (available to both ports) at cycle start.
35. If t
SPS
is violated, the semaphore is definitely obtained by one side or the other, but which side gets the semaphore is unpredictable.
CY7C026A
Document Number: 38-06046 Rev. *J Page 17 of 24
Figure 10. Timing Diagram of Read with BUSY (M/S = HIGH)
[36]
Figure 11. Write Timing with Busy Input (M/S = LOW)
Switching Waveforms (continued)
VALID
t
DDD
t
WDD
ADDRESS MATCH
ADDRESS MATCH
R/W
R
DATA
INR
DATA
OUTL
t
WC
ADDRESS
R
t
PWE
VALID
t
SD
t
HD
ADDRESS
L
t
PS
t
BLA
t
BHA
t
BDD
BUSY
L
t
PWE
R/W
BUSY
t
WB
t
WH
Note
36. CE
L
= CE
R
= LOW.
CY7C026A
Document Number: 38-06046 Rev. *J Page 18 of 24
Figure 12. Busy Timing Diagram No. 1 (CE Arbitration)
[37]
Figure 13. Busy Timing Diagram No. 2 (Address Arbitration)
[37]
Switching Waveforms (continued)
ADDRESS MATCH
t
PS
t
BLC
t
BHC
ADDRESS MATCH
t
PS
t
BLC
t
BHC
CE
R
Valid First:
ADDRESS
L,R
BUSY
R
CE
L
CE
R
BUSY
L
CE
R
CE
L
ADDRESS
L,R
CE
L
Valid First:
ADDRESS MATCH
t
PS
ADDRESS
L
BUSY
R
ADDRESS MISMATCH
t
RC
or t
WC
t
BLA
t
BHA
ADDRESS
R
ADDRESS MATCH ADDRESS MISMATCH
t
PS
ADDRESS
L
BUSY
L
t
RC
or t
WC
t
BLA
t
BHA
ADDRESS
R
Right Address Valid First:
Left Address Valid First:
Note
37. If t
PS
is violated, the busy signal is asserted on one side or the other, but there is no guarantee to which side BUSY is asserted.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24

CY7C026A-15AXI

Mfr. #:
Buy CY7C026A-15AXI
Manufacturer:
Cypress Semiconductor
Description:
SRAM 256Kb 15ns 16K x 16 Dual Port SRAM
Lifecycle:
New from this manufacturer.
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