CY7C026A-20AC(2000) Ver la hoja de datos (PDF) - Cypress Semiconductor

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CY7C026A-20AC
(Rev.:2000)

16K x 16/18 Dual-Port Static RAM

Cypress Semiconductor 

CY7C026A

CY7C036A

Switching Waveforms (continued)

Semaphore Read After Write Timing, Either Side[33]

A 0–A 2

SEM

VALID ADRESS

tAW

tHA

tSCE

tSAA

VALID ADRESS

tSOP

tACE

tOHA

I/O 0

R/W

OE

tSD

DATA IN VALID

tSA

tPWE

tHD

DATA OUT VALID

WRITE CYCLE

tSWRD

tSOP

tDOE

READ CYCLE

Timing Diagram of Semaphore Contention[34, 35, 36]

A0L –A2L

MATCH

R/WL

SEM L

A 0R–A2R

R/WR

SEM R

tSPS

MATCH

Notes:

33. CE = HIGH for the duration of the above timing (both write and read cycle).

34. I/O0R = I/O0L = LOW (request semaphore); CER = CEL = HIGH.

35. Semaphores are reset (available to both ports) at cycle start.

36. 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.

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