Cypress CY7C028V Bedienungsanleitung PDF herunterladen (Seite 11)

CY7C027V/027VN/027AV/028V

CY7C037V/037AV/038V

Document #: 38-06078 Rev. *B Page 11 of 18

Notes

29. CE

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

30. I/O

= I/O

= LOW (request semaphore); CE

= CE

= HIGH.

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

32. If t

SPS

is violated, the semaphore is definitely obtained by one side or the other, but which side gets the semaphore is unpredictable.

Switching Waveforms

(continued)

SOP

SAA

VALID ADRESS VALID ADRESS

DATA

VALID

DATA

OUT

VALID

OHA

ACE

SOP

SCE

PWE

SWRD

DOE

WRITE CYCLE READ CYCLE

R/W

I/O

SEM

–A

Figure 9. Semaphore Read After Write Timing, Either Side

[29]

MATCH

SPS

–A

MATCH

R/W

SEM

–A

R/W

SEM

Figure 10. Timing Diagram of Semaphore Contention

[30, 31, 32]

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1 2 ... 6 7 8 9 10 11 12 13 14 15 16 17 18

CY7C027V/027VN/027AV/028V 1
CY7C037V/037AV/038V 1
CY7C028V (64K x 16) 2
CY7C037V/037AV (32K x 18) 3
CY7C038V (64K x 18) 3

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