L8C203MMB40 datasheet, PDF - EEWORLD Datasheet

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L8C203MMB40: Description512/1K/2K/4K x 9-bit Asynchronous FIFO; File Size176KB，22 Pages; ManufacturerLOGIC Devices; Websitehttp://www.logicdevices.com/

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L8C203MMB40 Overview

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

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L8C201/202/203/204

DEVICES INCORPORATED

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

L8C201/202/203/204

DEVICES INCORPORATED

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

DESCRIPTION

The

L8C201, L8C202, L8C203,

and

L8C204

are dual-port First-In/First-

Out (FIFO) memories. The FIFO

memory products are organized as:

L8C201 — 512 x 9-bit

L8C202 — 1024 x 9-bit

L8C203 — 2048 x 9-bit

L8C204 — 4096 x 9-bit

Each device utilizes a special algorithm

that loads and empties data on a first-

in/first-out basis. Full and Empty flags

are provided to prevent data overflow

and underflow. Three additional pins

are also provided to allow for unlimited

expansion in both word size and depth.

Depth Expansion does not result in a

flow-through penalty. Multiple devices

are connected with the data and control

signals in parallel. The active device is

determined by the Expansion In (XI)

and Expansion Out (XO) signals which

are daisy chained from device to

device.

The read and write operations are

internally sequential through the use

of ring pointers. No address informa-

tion is required to load and unload

data. The write operation occurs

when the Write (W) signal is LOW.

Read occurs when Read (R) goes

LOW. The nine data outputs go to the

high impedance state when R is

HIGH. Retransmit (RT) capability

allows for reset of the read pointer

when RT is pulsed LOW, allowing for

retransmission of data from the

beginning. Read Enable (R) and Write

Enable (W) must both be HIGH

during a retransmit cycle, and then R

is used to access the data. A Half-Full

(HF) output flag is available in the

single device and width expansion

modes. In the depth expansion

configuration, this pin provides the

Expansion Out (XO) information

which is used to tell the next FIFO that

it will be activated.

These FIFOs are designed to have the

fastest data access possible. Even in

lower cycle time applications, faster

access time can eliminate timing

bottlenecks as well as leave enough

margin to allow the use of the devices

without external bus drivers.

READ

POINTER

FEATURES

First-In/First-Out (FIFO) using

Dual-Port Memory

Advanced CMOS Technology

High Speed — to 10 ns Access Time

Asynchronous and Simultaneous

Read and Write

Fully Expandable by both Word

Depth and/or Bit Width

Empty and Full Warning Flags

Half-Full Flag Capability

Auto Retransmit Capability

Package Styles Available:

• 28-pin Plastic DIP

• 32-pin Plastic LCC

• 28-pin Ceramic Flatpack

L8C201/202/203/204 B

LOCK

IAGRAM

DATA INPUTS

8-0

WRITE

CONTROL

RAM ARRAY

512 x 9-bit

1K x 9-bit

2K x 9-bit

4K x 9-bit

WRITE

POINTER

The FIFOs are designed for those

applications requiring asychronous

and simultaneous read/writes in

multiprocessing and rate buffer

applications.

THREE-STATE

BUFFERS

READ

CONTROL

DATA OUTPUTS

8-0

FL/RT

RESET

LOGIC

FLAG

LOGIC

EXPANSION

LOGIC

XO/HF

FIFO Products

03/04/99–LDS.8C201/2/3/4-H

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