LH540202U-35 データシートの表示（PDF） - Sharp Electronics

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LH540202U-35

CMOS 1024 × 9 Asynchronous FIFO

Sharp Electronics 

CMOS 1024 × 9 Asynchronous FIFO

LH540202

OPERATIONAL MODES

Standalone Configuration

When depth cascading is not required for a given

application, the LH540202 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.)

Width Expansion

Word-width expansion is implemented by placing

multiple LH540202 devices in parallel. Each LH540202

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

4, 5, and 6.)

WRITE

DATA IN

D0 - D8

FULL FLAG

RESET

HF

W

R

9

9

LH540202

FF

EF

RS

RT

XI

READ

DATA OUT

Q0 - Q8

EMPTY FLAG

RETRANSMIT

Figure 4. Standalone FIFO

(1024 × 9)

540202-17

DATA IN 18

D0 - D17

WRITE

FULL FLAG

RESET

HF

HF

9

9

W

W

EF

FF

R

LH540202

RS

LH540202

R

RS

RT

RT

9

9

XI

XI

Figure 5. FIFO Word-Width Expansion

(1024 × 18)

EMPTY FLAG

READ

RETRANSMIT

18

DATA OUT

Q0 - Q17

540202-18

5

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