LH540205 데이터 시트보기 (PDF) - Sharp Electronics

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LH540205

CMOS 8192 × 9 Asynchronous FIFO

Sharp Electronics 

CMOS 8192 × 9 Asynchronous FIFO

LH540205

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 LH540205 devices in par-

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

LH540205 are tied to the corresponding Data Out outputs

of another LH540205, 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.

Q0 - Q8

Q0 - Q17

Q0 - QN-10

Q0 - QN-1

DATA OUT

R

W

RS

DATA IN

LH540205

DEPTH EXPANSION

BLOCK

LH540205

DEPTH EXPANSION

BLOCK

LH540205

DEPTH EXPANSION

BLOCK

D0 - DN-1

D9 - DN-1

D18 - DN-1

DN-9 - DN-1

Figure 6. Compound FIFO Expansion

ARRAY STORES

N-BIT WORDS.

540205-20

Wa

FFa

RS

SYSTEM A

Ra

EFa

HFa

RTa

LH540205

Da0 - 8

XI

Qb0 - 8

Rb

EFb

HFb

RTb

SYSTEM B

Qa0 - 8

LH540205

Db0 - 8

Wb

FFb

RS

XI

Figure 7. Bidirectional FIFO Operation

(8192 × 9 × 2)

540205-21

7

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