IDT7280(1996) Просмотр технического описания (PDF) - Integrated Device Technology

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IDT7280
(Rev.:1996)

CMOS DUAL ASYNCHRONOUS FIFO DUAL 256 x 9, DUAL 512 x 9, DUAL 1024 x 9

Integrated Device Technology 

IDT7280/7281/7282 CMOS DUAL ASYNCHRONOUS FIFO

DUAL 256 x 9, DUAL 512 x 9 and DUAL 1K x 9

PRELIMINARY INFORMATION

COMMERCIAL TEMPERATURE RANGE

W

D

FULL

RSA

XOA

FFA

EFA

FIFO A

FLA

XIA

7280/

7281/

7282

XOB

R

FFB

EFB

FIFO B

9

9

9

Q

FLB

XIB

XOA

V CC

FFA

9

FFB

9

EFA

FIFO A

FLA

XIA

7280/

7281/

7282

XOB

EFB

FIFO B

EMPTY

FLB

XIB

3208 drw 16

Figure 14. Block Diagram of 1024 x 9/2048 x 9/4096 x 9 FIFO Memory (Depth Expansion)

Q 0–Q 8

Q 0–Q 8

Q 9–Q 17

•••

Q 9–Q 17

R, W, RS

D 0 –D N

IDT7280/

IDT7281/

IDT7282

DEPTH

EXPANSION

BLOCK

D 0 -D 8

D 9 -D N

IDT7280/

IDT7281/

IDT7282

DEPTH

•••

EXPANSION

BLOCK

D 9 -D 17

•••

D 18 -D N

Figure 15. Compound FIFO Expansion

NOTES:

1. For depth expansion block see section on Depth Expansion and Figure 14.

2. For Flag detection see section on Width Expansion and Figure 13.

Q (N-8) -Q N

Q (N-8) -Q N

IDT7280/

IDT7281/

IDT7282

DEPTH

EXPANSION

BLOCK

D (N-8)-D N

D (N-8)-D N

3208 drw 17

5.07

10

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