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DM9161A

10/100 Mbps Fast Ethernet Physical Layer Single Chip Transceiver

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DM9161A

10/100 Mbps Fast Ethernet Physical Layer Single Chip Transceiver

1. General Description

The DM9161A 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 DM9161A connects to the Medium Access Control (MAC) layer, ensuring a high

inter operability from different vendors.

TheDM9161A uses a low power and high performance advanced 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 DM9161A 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 DM9161A needs no external filter to transport signals to the media in

100BASE-TX or 10BASE-T Ethernet operation.

2. Features

„ Fully comply with IEEE 802.3 / IEEE 802.3u 10Base-T/

100Base-TX, ANSI X3T12 TP-PMD 1995 standard

„ Support MDI/MDI-X auto crossover function

(Auto-MDI)

„ Support Auto-Negotiation function, compliant with IEEE

802.3u

„ Fully integrated Physical layer transceiver On-chip

filtering with direct interface to magnetic transformer

„ Selectable repeater or node mode

„ Selectable MII or RMII (Reduced MII) mode for

100Base-TX and 10Base-TX. Selectable MII or GPSI

(7-Wired) mode for 10Base-T

„ Selectable full-duplex or half-duplex operation

„ MII management interface with maskable interrupt

output capability

„ Provide Loopback mode for easy system

diagnostics

„ LED status outputs indicate Link/ Activity, Speed10/100

and Full-duplex/Collision. Support Dual-LED optional

control

„ Single low power Supply of 3.3V with an advanced

CMOS technology

„ Very Low Power consumption modes:

● Power Reduced mode (cable detection)

● Power Down mode

● Selectable TX drivers for 1:1 or 1.25:1 transformers

for additional power reduction. 1: 1 transformers only

when Auto MDIX Enable .

„ Compatible with 3.3V and 5.0V tolerant I/Os

„ 48-pin LQFP

3

Preliminary

Version: DM9161A-DS-P04

Jan. 19, 2005

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