Cypress CY7C0251AV Manual de usuario descargar pdf (Pagina 11)

CY7C024AV/024BV/025AV/026AV

CY7C0241AV/0251AV/036AV

Document #: 38-06052 Rev. *J Page 11 of 19

Switching Waveforms

Notes

29. R/W

is HIGH for read cycles.

30. Device is continuously selected CE

= V

and UB or LB = V

. This waveform cannot be used for semaphore reads.

31. OE

= V

32. Address valid prior to or coincident with CE

transition LOW.

33. To access RAM, CE

= V

, UB or LB = V

, SEM = V

. To access semaphore, CE = V

, SEM = V

OHA

DATA VALIDPREVIOUS DATA VALID

DATA OUT

ADDRESS

OHA

Figure 5. Read Cycle No. 1 (Either Port Address Access)

[29, 30, 31]

ACE

LZOE

DOE

HZOE

HZCE

DATA VALID

LZCE

DATA OUT

CE and

or UB

CURRENT

Figure 6. Read Cycle No. 2 (Either Port CE/OE Access)

[29, 32, 33]

UB or LB

DATA OUT

ADDRESS

OHA

LZCE

ABE

HZCE

ACE

LZCE

Figure 7. Read Cycle No. 3 (Either Port)

[29, 31, 32, 33]

[+] Feedback

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 17 18 19

Static RAM 1
CY7C024AV/024BV (4K × 16) 2
CY7C025AV (8K × 16) 2
CY7C036AV (16K × 18) 4
Write Operation 5
Read Operation 5
Interrupts 5
Master/Slave 6
Semaphore Operation 6
CY7C024AV/024BV/025AV/026AV 10
CY7C0241AV/0251AV/036AV 10

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Cypress CY7C0251AV Manual de usuario Pagina 11

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