CY7C4235-15AC 参数 Datasheet PDF下载

CY7C4425/4205/4215

CY7C4225/4235/4245

Switching Waveforms

(continued)

Read Expansion Out Timing

t

CLKH

WCLK

Note 32

t

XO

RXO

t

ENS

REN

42X5–20

t

XO

Write Expansion In Timing

t

XI

WXI

WCLK

t

XIS

42X5–21

Read Expansion In Timing

t

XI

RXI

t

XIS

RCLK

42X5–22

Retransmit Timing

[33, 34, 35]

FL/RT

t

PRT

t

RTR

REN/WEN

EF/FF

and all

async flags

HF/PAE/PAF

Notes:

32. Read from Last Physical Location.

33. Clocks are free running in this case.

34. The flags may change state during Retransmit as a result of the offset of the read and write pointers, but flags will be valid at t

RTR

.

35. For the synchronous PAE and PAF flags (SMODE), an appropriate clock cycle is necessary after t

RTR

to update these flags.

42X5–23

13