IDT72801(2001) 데이터 시트보기 (PDF) - Integrated Device Technology

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IDT72801
(Rev.:2001)

DUAL CMOS SyncFIFO™

Integrated Device Technology 

IDT72801/728211/72821/72831/72841/72851

Commercial And Industrial Temperature Range

WCLKA

(WCLKB)

WENA1

(WENB1)

WENA2 (WENB2)

(If Applicable)

tCLKH

tCLKL

tENS

tENS

(4)

tENH

tENH

PAFA

(PAFB)

RCLKA (RCLKB)

RENA1, RENA2

(RENB1, RENB2)

tPAF

Full - (m+1) words in FIFO (1)

(2)

Full - m words in FIFO

(3)

tSKEW2

tPAF

tENS

tENH

3034 drw 11

NOTES:

1. m = PAF offset.

2. (256-m) words for the IDT72801; (512-m) words the IDT72811; (1,024-m) words for the IDT72821; (2,048-m) words for the IDT72831; (4,096-m) words for the IDT72841; or (8,192-m)

words for the IDT72851.

3. tSKEW2 is the minimum time between a rising RCLKA (RCLKB) edge and a rising WCLKA (WCLKB) edge for PAFA (PAFB) to change during that clock cycle. If the time between the

rising edge of RCLKA (RCLKB) and the rising edge of WCLKA (WCLKB) is less than tSKEW2, then PAFA (PAFB) may not change state until the next WCLKA (WCLKB) rising edge.

4. If a write is performed on this rising edge of the write clock, there will be Full - (m-1) words in FIFO A (B) when PAFA (PAFB) goes LOW.

Figure 10. Programmable Full Flag Timing

WCLKA (WCLKB)

WENA1

(WENB1)

WENA2 (WENB2)

(If Applicable)

tCLKH

tCLKL

tENS

tENS

tENH

tENH

PAEA,

PAEB

n words in FIFO (1)

tSKEW2 (2)

tPAE

RCLKA (RCLKB)

RENA1, RENA2

(RENB1, RENB2)

n+1 words in FIFO

tENS

tENH

tPAE

(3)

3034 drw 12

NOTES:

1. n = PAE offset.

2. tSKEW2 is the minimum time between a rising WCLKA (WCLKB) edge and a rising RCLKA (RCLKB) edge for PAEA (PAEB) to change during that clock cycle. If the time between the

rising edge of WCLKA (WCLKB) and the rising edge of RCLKA (RCLKB) is less than tSKEW2, then PAEA (PAEB) may not change state until the next RCLKA (RCLKB) rising edge.

3. If a read is performed on this rising edge of the read clock, there will be Empty + (n-1) words in FIFO A (B) when PAEA (PAEB) goes LOW.

Figure 11. Programmable Empty Flag Timing

12

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