L8C204PI25 datasheet(3/22 Pages) LODEV

部件名	L8C204PI25

功能描述	512/1K/2K/4K x 9-bit Asynchronous FIFO

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制造商	LODEV [LOGIC Devices Incorporated]

网页	http://www.logicdevices.com

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DEVICES INCORPORATED

3

L8C201/202/203/204

512/1K/2K/4K x 9-bit Asynchronous FIFO

03/04/99–LDS.8C201/2/3/4-H

FIFO Products

4. External logic is needed to generate

a composite Full Flag (FF) and

Empty Flag (EF). This requires the

ORing of all EFs and ORing of all

FFs (i.e., all must be set to generate

the correct composite FF or EF).

5. The Retransmit (RT) function and

Half-Full Flag (HF) are not avail-

able in the Depth Expansion Mode.

Bidirectional Mode

Applications which require data

buffering between two systems (each

system capable of read and write

operations) can be achieved by pairing

FIFOs. Care must be taken to assure

that the appropriate flag is monitored

by each system (i.e., FF is monitored

on the device when W is used; EF is

monitored on the device when R is

used). Both Depth Expansion and

Width Expansion may be used in this

mode.

OPERATING MODES

Single Device Mode

A single FIFO may be used when the

application requirements are for the

number of words in a single device.

The FIFOs are in a Single Device

Configuration when the Expansion In

(XI) control input is grounded. In this

mode the Half-Full Flag (HF), which is

an active-low output, is the active

function of the combination pin XO/

HF.

Width Expansion Mode

Word width may be increased simply

by connecting the corresponding input

control signals of multiple devices.

Status flags (EF, FF, and HF) can be

detected from any one device. Any

word width can be attained by adding

additional FIFOs. Flag detection is

accomplished by monitoring the FF,

EF, and HF signals on either (any)

device used in the width expansion

configuration. Do not connect any

output signals together.

Depth Expansion (Daisy Chain) Mode

The FIFOs can easily be adapted to

applications where the requirements

are for greater than the number of

words in a single device. Any depth

can be attained by adding additional

FIFOs. The FIFOs operates in the

Depth Expansion configuration when

the following conditions are met:

1. The first device must be designated

by grounding the First Load (FL)

control input.

2. All other devices must have FL in

the HIGH state.

3. The Expansion Out (XO) pin of

each device must be tied to the

Expansion In (XI) pin of the next

device with the last device connect-

ing back to the first.

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