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DM9095

Twisted-Pair Medium Attachment Unit

General Description

The DM9095 twisted-pair Media Attachment Unit

(TPMAU) is designed to allow Ethernet connections

to use existing Twisted-pair wiring plants through an

Ethernet Attachment Unit Interface (AUI). The

DM9095 provides the electrical interface between

the AUI and the twisted-pair wire.

The DM9095鈥檚 functions include level-shifted data

pass-through from one transmission media to

another, collision detection, transmitting pre-

distortion

generation, receiving squelch function, selectable

signal-quality-error (SQE) test generation, a link-

integrity strapping option, and automatic correction

of polarity reversal on the twisted pair input. The

DM9095 also includes LED drivers for transmit,

receive, jabber, collision, reversed polarity detect

and link status.

The DM9095 is an advanced CMOS device

available in 28-pin PLCC packages.

Block Diagram

DO +

DO -

AUI

Data

Receiver

Jabber

AUI

Data

Squelch

TP

Pre-Distortion

Driver

TPO +

DTPO +

DTPO -

TPO-

MD0

MD1

MD2

DI +

DI -

Operation

Mode

Selection

AUI

Current

Driver

Collision

Current

Driver

Link

Integrity

LI-

Loopback

Control

Auto-Polarity

Detection

TP

Data

Receiver

TP

Data

Squelch

AP

CI +

CI -

Collision

Control

TPI +

TPI -

OSC1

Crystal

Oscillator

LED

Drivers

RLED CLED XLED JLED

1

Final

Version: DM9095-DS-F02

August 21, 2000

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