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DM9161

10/100 Mbps Fast Ethernet Physical Layer Single Chip Transceiver

1. General Description

The DM9161 is a physical layer, single-chip, and low

power transceiver for 100BASE-TX and 10BASE-T

operations. On the media side, it provides a direct

interface either to Unshielded Twisted Pair Category 5

Cable (UTP5) for 100BASE-TX Fast Ethernet, or

UTP5/UTP3 Cable for 10BASE-T Ethernet. Through

the Media Independent Interface (MII), the DM9161

connects to the Medium Access Control (MAC) layer,

ensuring a high inter operability from different vendors.

The DM9161 uses a low power and high performance

CMOS process. It contains the entire physical layer

functions of 100BASE-TX as defined by IEEE802.3u,

including the Physical Coding Sublayer (PCS),

Physical Medium Attachment (PMA), Twisted Pair

Physical Medium Dependent Sublayer (TP-PMD),

10BASE-TX Encoder/Decoder (ENC/DEC), and

Twisted Pair Media Access Unit (TPMAU). The

DM9161 provides a strong support for the auto-

negotiation function, utilizing automatic media speed

and protocol selection. Furthermore, due to the built-in

wave shaping filter, the DM9161 needs no external

filter to transport signals to the media in 100BASE-TX

or 10BASE-T Ethernet operation.

2. Block Diagram

100Base-TX

100Base-TX

Transceiver

PCS

MII

Interface

10Base-T

TX/RX Module

LED Driver

Auto-Negotiation

Clock

Circuit

Block

Biasing/

Power

Block

MII

Register

MII

Management

Control

Final

Version: DM9161-DS-F02

May 10,2002

1

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