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CY7C009-20AI Datasheet(PDF) 11 Page - Cypress Semiconductor

Part # CY7C009-20AI
Description  64K/128K x 8/9 Dual-Port Static RAM
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Manufacturer  CYPRESS [Cypress Semiconductor]
Direct Link  http://www.cypress.com
Logo CYPRESS - Cypress Semiconductor

CY7C009-20AI Datasheet(HTML) 11 Page - Cypress Semiconductor

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CY7C008/009
CY7C018/019
Document #: 38-06041 Rev. *D
Page 11 of 19
Notes:
35. CE = HIGH for the duration of the above timing (both write and read cycle).
36. I/O0R = I/O0L = LOW (request semaphore); CER = CEL = HIGH.
37. Semaphores are reset (available to both ports) at cycle start.
38. If tSPS is violated, the semaphore will definitely be obtained by one side or the other, but which side will get the semaphore is unpredictable.
Switching Waveforms (continued)
tSOP
tSAA
VALID ADRESS
VALID ADRESS
tHD
DATAIN VALID
DATAOUT VALID
tOHA
tAW
tHA
tACE
tSOP
tSCE
tSD
tSA
tPWE
tSWRD
tDOE
WRITE CYCLE
READ CYCLE
OE
R/W
I/O0
SEM
A0–A2
Semaphore Read After Write Timing, Either Side[35]
MATCH
tSPS
A0L–A2L
MATCH
R/WL
SEML
A0R–A2R
R/WR
SEMR
Timing Diagram of Semaphore Contention[36, 37, 38]


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