LH540225 datasheet(11/48 Pages) SHARP

Part #	LH540225

Description	512 x 18 / 1024 x 18 Synchronous FIFO

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Manufacturer	SHARP [Sharp Corporation]

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DESCRIPTION OF SIGNALS AND

OPERATING SEQUENCES

Table 1. Grouping-Mode Determination

During a Reset Operation

5

EMODE

WXI/

WEN2

RXI/

REN2

FL/

RT

MODE

WXO/HF

USAGE

WXI/

WEN2

USAGE

RXI/

REN2

USAGE

FL/

RT

USAGE

RXO

/EF2

USAGE

H 1

HH

H

Cascaded

Slave 2

WXO

WXI

RXI

FL

RXO

H 1

HH

L

Cascaded

Master

2

WXO

WXI

RXI

FL

RXO

H

HL

X

(Reserved)

–––––

H

LH

X

(Reserved)

–––––

H

LL

H 3

(Not Allowed

During Reset)

(HF)

(none)

(RT)

(none)

H

LL

L 3

Standalone

HF

(none)

RT

(none)

LX

X

H 3

(Not Allowed

During Reset)

(HF)

(WEN2)

(REN2)

(RT)

(EF2)

LX

X

L 3

Interlocked

Paralleled 4

HF

WEN2

REN2

RT

EF2

NOTES:

1.

In IDT-compatible cascading, a reset operation forces WXO/HF and RXO/

EF2 HIGH for the nth FIFO, thus forcing WXI/WEN2 and RXI/REN2

HIGH for the (n + 1)st FIFO.

2.

The terms ‘master’ and ‘slave’ refer to IDT-compatible cascading. In pipelined cascading4, there is no such distinction.

3. Once grouping mode has been determined during a reset operation, FL/RT then may go HIGH to activate a retransmit operation.

4. EMODE must be asserted for access to the Control Register to be enabled. Also, FIFOs being used in a pipelined-cascading

configuration should be in Interlocked Paralleled mode.

5.

Setup-time and recovery-time specifications apply during a reset operation.

6.

H = HIGH; L = LOW; X = Don’t Care.

Table 2. Expansion-Pin Usage According to

Grouping Mode

I/O

IDT-COMPATIBLE OPERATING MODE

ENHANCED

OPERATING MODE

DEPTH-CASCADED

MASTER

DEPTH-CASCADED

SLAVE

STANDALONE

INTERLOCKED

PARALLELED

I

WXI /

WEN2

From WXO ((n-1)st FIFO)

Grounded

From FF (other FIFO)

O

WXO/HF

To WXI ((n+1)st FIFO)

Becomes HF

I

RXI/

REN2

From RXO ((n-1)st FIFO)

Grounded

From EF (other FIFO)

O

RXO

/EF2

To RXI ((n+1)st FIFO)

Unused

Becomes EF2

I

FL/

RT

Grounded (Logic LOW)

Logic HIGH

Becomes RT

1

Becomes RT

1

NOTE:

1.

FL/

RT may be grounded if the Retransmit facility is not being used.

BOLD ITALIC = Enhanced Operating Mode

512 x 18/1024 x 18 Synchronous FIFO

LH540215/25

11

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