LH540205D-20 データシートの表示（PDF） - Sharp Electronics

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LH540205D-20

CMOS 8192 × 9 Asynchronous FIFO

Sharp Electronics 

CMOS 8192 × 9 Asynchronous FIFO

OPERATIONAL MODES

Standalone Configuration

When depth cascading is not required for a given

application, the LH540205 is placed in standalone mode

by tying the Expansion In input (XI) to ground. This

input is internally sampled during a reset operation. (See

Table 1.)

LH540205

Width Expansion

Word-width expansion is implemented by placing mul-

tiple LH540205 devices in parallel. Each LH540205

should be configured for standalone mode. In this ar-

rangement, the behavior of the status flags is identical for

all devices; so, in principle, a representative value for

each of these flags could be derived from any one device.

In practice, it is better to derive ‘composite’ flag values

using external logic, since there may be minor speed

variations between different actual devices. (See Figures

3 and 4.)

W

WRITE

HF

R

DATA IN

9

9

D0 - D8

LH540205

FF

EF

FULL FLAG

RESET

RS

RT

XI

READ

DATA OUT

Q0 - Q8

EMPTY FLAG

RETRANSMIT

Figure 3. Standalone FIFO (8192 × 9)

540205-17

DATA IN

18

D0 - D17

WRITE

FULL FLAG

RESET

HF

9

W

FF

R

LH540205

RS

RT

9

XI

HF

9

W

EF

LH540205

R

RS

RT

9

XI

Figure 4. FIFO Word-Width Expansion (8192 × 18)

EMPTY FLAG

READ

RETRANSMIT

18

DATA OUT

Q0 - Q17

540205-18

5

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