AM79C940VCW datasheet(83/122 Pages) AMD

83 / 122 page

AMD

Am79C940

Attachment Unit Interface (AUI)

The AUI can drive up to 50 m of standard drop cable to

allow the transceiver to be remotely located, as is typi-

cally the case in IEEE 803.3 10BASE5 or thick Ether-

net

® installations. For a locally mounted transceiver,

such as 802.3 10BASE2 or Cheapernet interface, the

isolation transformer requirements between the trans-

ceiver and the MACE device can be reduced.

When used with the Am79C98 TPEX

™ (Twisted Pair

Ethernet Transceiver), the isolation requirements of the

AUI are completely removed providing that the trans-

ceiver is mounted locally. For remote location of the

TPEX via an AUI drop cable, the isolation requirement is

necessary to meet IEEE 802.3 specifications for fault

tolerance and recovery.

CPU

Memory

Power

Supply

Local Bus

10BASE5/Ethernet

DTE

AUI

Cable

MAU

Tap

Am7996

Transceiver

Ethernet

Coax

16235C-14

Am79C940

AUI-10BASE5/Ethernet Example

RG58

BNC “T”

System

CPU

Local

Memory

10BASE2/Cheapernet

Cheapernet

Coax

Power

Supply

Am7996

Transceiver

Am79C940

DMA

Engine

I/O Bus

16235C-15

AUI-10BASE2/Cheapernet Example

AM79C940VCW Datenblatt(PDF) 83 Page - Advanced Micro Devices

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