AM79C100JC datasheet(1/24 Pages) AMD

部件名	AM79C100JC

功能描述	Twisted-Pair Ethernet Transceiver Plus (TPEX Plus)

PDF	24 Pages

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制造商	AMD [Advanced Micro Devices]

网页	http://www.amd.com

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1 / 24 page

FINAL

Publication# 16511

Rev: B Amendment/0

Issue Date: May 1994

1

Am79C100

Twisted-Pair Ethernet Transceiver Plus (TPEX Plus)

DISTINCTIVE CHARACTERISTICS

s CMOS device provides IEEE 802.3-compliant

operation and low operating current from a

single +5 V supply

s Power Down mode for reduced power

consumption in battery-powered applications

s Automatic twisted-pair link integrity

s Pin-selectable twisted-pair receive polarity

detection and automatic inversion of the receive

signal. Polarity indication output pin can

directly drive an LED.

s Pin-selectable twisted-pair link integrity test

capability conforming to the IEEE 802.3

standard. Link status pin can directly drive

an LED.

s Transmit, receive, and collision status

indications available on separate, dedicated

pins

s Outputs can directly drive LEDs with pulses

stretched to ensure LED visibility

s Internal twisted-pair transmitter digital

predistortion circuit to reduce medium-induced

jitter

s Pin-selectable SQE Test (heartbeat) enable

s AUI loopback, Jabber Control, and SQE Test

functions comply with the 10BASE-T standard

s User-selectable loopback operations

s Pin-selectable twisted-pair receive threshold

programming for extended distance line lengths

GENERAL DESCRIPTION

The Am79C100 Twisted-Pair Ethernet Transceiver Plus

(TPEX Plus) is an integrated circuit that implements the

medium attachment unit (MAU) functions for the

twisted-pair medium, as speciﬁed by the supplement to

the IEEE 802.3 standard (Type 10BASE-T). This de-

vice provides the necessary electrical and functional

interface between the IEEE 802.3 standard attachment

unit interface (AUI) and the twisted-pair cable.

A network based on the 10BASE-T standard can use

unshielded twisted-pair cables, providing an economi-

cal solution to networking by allowing the use of existing

telephone wiring. The Am79C100 provides a minimal

component count and a cost-effective solution to the

design and implementation of 10BASE-T standard

networks.

TPEX Plus provides twisted-pair driver and receiver cir-

cuits, including on-board transmit digital predistortion,

receiver squelch, and an AUI port with pin-selectable

SQE Test enable. The device provides a number of ad-

ditional features, including Link Status indication with

automatic twisted-pair receive polarity detection/

correction and indication; pin-selectable receive

threshold programming for extended distance line

lengths; and Receive Carrier Sense, Transmit Active

and Collision Present indications. The device provides

separate twisted-pair Link Status, Polarity Status,

Receive, Transmit, and Collision outputs to drive LEDs

directly.

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