LH540202 datasheet(7/18 Pages) SHARP

Part #	LH540202

Description	CMOS 1024 x 9 Asynchronous FIFO

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Manufacturer	SHARP [Sharp Corporation]

Direct Link	http://sharp-world.com/

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OPERATIONAL MODES (cont’d)

Compound FIFO Expansion

A combination of word-width expansion and depth

cascading may be implemented easily by operating

groups of depth-cascaded FIFOs in parallel.

Bidirectional FIFO Operation

Bidirectional data buffering between two systems may

be implemented by operating LH540202 devices in par-

allel, but in opposite directions. The Data In inputs of each

LH540202 are tied to the corresponding Data Out outputs

of another LH540202, which is operating in the opposite

direction, to form a single bidirectional bus interface. Care

must be taken to assure that the appropriate read, write,

and flag signals are routed to each system. Both word-

width expansion and depth cascading may be used in

bidirectional applications.

LH540202

DEPTH EXPANSION

BLOCK

LH540202

DEPTH EXPANSION

BLOCK

LH540202

DEPTH EXPANSION

BLOCK

Q0 - Q8

DATA OUT

DATA IN

R

W

RS

Q0 - QN-1

Q0 - Q17

540202-20

DN-9 - DN-1

D18 - DN-1

D9 - DN-1

D0 - DN-1

ARRAY STORES

N-BIT WORDS.

Q0 - QN-10

Figure 7. Compound FIFO Expansion

LH540202

SYSTEM A

SYSTEM B

Qb0 - 8

Db0 - 8

Da0 - 8

Qa0 - 8

XI

Wb

Ra

EFa

HFa

RTa

RS

FFb

RTb

HFb

EFb

Rb

540202-21

XI

Wa

FFa

RS

Figure 8. Bidirectional FIFO Operation

(1024

× 9 × 2)

CMOS 1024

× 9 Asynchronous FIFO

LH540202

7

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