LH540215 datasheet(38/48 Pages) SHARP

Part #	LH540215

Description	512 x 18 / 1024 x 18 Synchronous FIFO

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Manufacturer	SHARP [Sharp Corporation]

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APPLICATIONS INFORMATION

Standalone Configuration

When depth cascading is not required for a given

application, the LH540215/25 is placed in standalone

mode by tying the two Expansion In pins WXI/

WEN2 and

RXI/

REN2 to ground, while also holding the First

Load/Retransmit pin FL/

RT LOW for the duration of any

reset operation. (See Table 1.) Subsequently, FL/

RT may

be taken HIGH at will, whenever a retransmit operation is

desired. If not being used, FL/RT also may be tied to

ground, as shown in Figure 26.

Width Expansion

Word-width expansion is implemented by placing mul-

tiple LH540215/25 devices in parallel. Each device should

be configured for standalone mode, unless the depth of

one single FIFO is not adequate for the application. In this

event, word-width expansion may in principle be used

with either of the two depth-cascading schemes sup-

ported by the LH540215/25 architecture. In practice, the

reliability benefits of interlocked-paralleled operation are

available only with the pipelining scheme, making it the

preferred alternative. (Refer to discussion in a later sec-

tion.)

RXI

RCLK

540215-19

tXI

tXIS

Figure 25. Read-Expansion-In Timing,

IDT-Compatible Operating Mode

WRITE ENABLE (WEN)

WRITE CLOCK (WCLK)

LOAD (LD)

DATA IN

FULL FLAG (FF)

PROGRAMMABLE

ALMOST-EMPTY FLAG (PAE)

HALF-FULL FLAG (WXO/HF)

READ CLOCK (RCLK)

READ ENABLE (REN)

OUTPUT ENABLE (OE)

DATA OUT

EMPTY FLAG (EF)

PROGRAMMABLE

ALMOST-FULL FLAG (PAF)

WRITE EXPANSION IN (WXI/

WEN2)

FIRST LOAD (FL/

RT)

(MUST BE LOW

DURING A RESET

OPERATION)

540215-21

LH540215/25

RESET (RS)

ENHANCED

MODE (EMODE)

BOLD ITALIC = Enhanced Operating Mode.

READ EXPANSION IN (RXI/

REN2)

D[17:0]

Q[17:0]

18

Figure 26. Standalone FIFO

(512

× 18 / 1024 × 18)

TIMING DIAGRAMS (cont’d)

BOLD ITALIC = Enhanced Operating Mode

LH540215/25

512 x 18/1024 x 18 Synchronous FIFO

38

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LH540215 Datasheet(PDF) 38 Page - Sharp Corporation

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