DP83902A datasheet(1/70 Pages) NSC

No de pièce	DP83902A

Description	ST-NICTM Serial Network Interface Controller for Twisted Pair

PDF	70 Pages

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Fabricant	NSC [National Semiconductor (TI)]

Site Internet	http://www.national.com

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TLF11157

PRELIMINARY

November 1995

DP83902A ST-NIC

TM

Serial Network Interface Controller for Twisted Pair

General Description

The DP83902A Serial Network Interface Controller for

Twisted Pair (ST-NIC) is a microCMOS VLSI device de-

signed for easy implementation of CSMACD local area net-

works These include Ethernet (10BASE5) Thin Ethernet

(10BASE2) and Twisted-pair Ethernet (10BASE-T) The

overall ST-NIC solution provides the Media Access Control

(MAC) and Encode-Decode (ENDEC) with an AUI interface

and 10BASE-T transceiver functions in accordance with the

IEEE 8023 standards

The DP83902A’s 10BASE-T transceiver fully complies with

the IEEE standard This functional block incorporates the

receiver transmitter collision heartbeat loopback jabber

and link integrity blocks as defined in the standard The

transceiver when combined with equalization resistors

transmitreceive filters and pulse transformers provides a

complete physical interface from the DP83902A’s ENDEC

module and the twisted pair medium

The integrated ENDEC module allows Manchester encod-

ing and decoding via a differential transceiver and phase

lock loop decoder at 10 Mbitsec Also included are colli-

sion detect translator and diagnostic loopback capability

The ENDEC module interfaces directly to the transceiver

module and also provides a fully IEEE compliant AUI (At-

tachment Unit Interface) for connection to other media

transceivers

(Continued)

Features

Y

Single chip solution for IEEE 8023 10BASE-T

Y

Integrated controller ENDEC and transceiver

Y

Full AUI interface

Y

No external precision components required

Y

3 levels of loopback supported

Transceiver Module

Y

Integrates transceiver electronics including

Transmitter and receiver

Collision detect heartbeat and jabber timer

Link integrity test

Y

Link disable and polarity detectioncorrection

Y

Integrated smart receive squelch

Y

Reduced squelch level for extended distance cable op-

eration (100-pin QFP version)

ENDEC Module

Y

10 Mbs Manchester encodingdecoding plus clock re-

covery

Y

Transmitter half or full step mode

Y

Squelch on receive and collision pairs

Y

Lock time 5 bits typical

Y

Decodes Manchester data with up to g18 ns jitter

MACController Module

Y

100% DP8390 softwarehardware compatible

Y

Dual 16-bit DMA channels

Y

16-byte internal FIFO

Y

Efficient buffer management implementation

Y

Independent system and network clocks

Y

Supports physical multicast and broadcast address fil-

tering

Y

Network statistics storage

10 System Diagram

Station or DTE

TLF11157 – 1

TRI-STATE

is a registered trademark of National Semiconductor Corporation

ST-NICTM is a trademark of National Semiconductor Corporation

C1995 National Semiconductor Corporation

RRD-B30M115Printed in U S A

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