IDT7208 CMOS ASYNCHRONOUS FIFO

65,536 x 9

COMMERCIAL TEMPERATURE RANGES

5.06

9

Figure 12. Block Diagram of 65,536 x 9 FIFO Used in Single Device Mode

NOTE:

1. Flag detection is accomplished by monitoring the

FF, EF and HF signals on either (any) device used in the width expansion configuration.

Do not connect any output signals together.

Figure 13. Block Diagram of 65,536 x 18 FIFO Memory Used in Width Expansion Mode

IDT

7208

XI

XI

9

18

9

WRITE (

W)

FULL FLAG (

FF)

RESET (

RS)

99

18

HF

HF

DATA

(D)

IN

READ (

R)

EMPTY FLAG (

EF)

RETRANSMIT (

RT)

DATA

(Q)

OUT

IDT

7208

3274 drw 16

WRITE (

W)

DATA IN (D)

FULL FLAG (

FF)

RESET (

RS)

9

READ (

R)

9

DATA OUT (Q)

EMPTY FLAG (

EF)

RETRANSMIT (

RT)

EXPANSION IN (

XI)

(

HF)

IDT

7208

(HALF–FULL FLAG)

3274 drw 15