CY7C4215-15AXI(2011) Ver la hoja de datos (PDF) - Cypress Semiconductor

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Lista de partido

CY7C4215-15AXI
(Rev.:2011)

256/512/1K/4K x 18 Synchronous FIFOs

Cypress Semiconductor 

CY7C4205/CY7C4215

CY7C4225/CY7C4245

Switching Waveforms (continued)

Figure 14. Programmable Almost Full Flag Timing

WCLK

WEN

PAF[29]

RCLK

REN

tCLKH

Note 28

tCLKL

tENS tENH

tPAF

FULL  M WORDS

IN FIFO [30]

FULL  M + 1 WORDS

IN FIFO [31]

tPAF

tENS

Figure 15. Programmable Almost Full Flag Timing (applies only in SMODE (SMODE in LOW))

WCLK

tCLKH

WEN

PAF

RCLK

REN

tCLKL

Note 32

tENS tENH

FULL – M + 1 WORDS

IN FIFO

Note 33 tPAF

FULL  M WORDS

IN FIFO [30]

tSKEW3 [34]

tENS

tENS tENH

tPAFsynch

Notes:

28. PAF offset = m. Number of data words written into FIFO already = 64  m + 1 for the CY7C4205, 256  m + 1 for the CY7C4205, 512m + 1 for the CY7C4215. 1024

 m + 1 for the CY7C4225, 2048  m + 1 for the CY7C4235, and 4096  m + 1 for the CY7C4245.

29. PAF is offset = m.

30. 64  m words in CY7C4205, 256 – m words in CY7C4205, 512 m words in CY7C4215. 1024 – m words in CY7C4225, 2048  m words in CY7C4235, and 4096 – m

words in CY7C4245.

31. 64 m + 1 words in CY7C4205, 256 m + 1 words in CY7C4205, 512  m + 1 words in CY7C4215, 1024  m + 1 CY7C4225, 2048  m + 1 in CY7C4235, and 4096

 m + 1 words in CY7C4245.

32. If a write is performed on this rising edge of the write clock, there will be Full – (m–1) words of the FIFO when PAF goes LOW.

33. PAF offset = m.

34.

tthSKeErWis3inigs

the minimum time between

edge of WCLK is less than

a rising

tSKEW3,

RCLK and a rising

then PAF may not

WCLK edge for PAF to change state during that

change state until the next WCLK rising edge.

clock

cycle.

If

the

time

between

the

edge

of

RCLK

and

Document Number: 001-45652 Rev. *B

Page 17 of 25

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