DM9161EP Product Brief

10/100 Mbps Fast Ethernet Physical Layer Single Chip Transceiver

June 2008 Rev.1.0

The DM9161EP is a physical layer, single-chip, and low power transceiver for

100BASE-TX 100BASE-FX 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 DM9161EP connects to the

Medium Access Control (MAC) layer, ensuring a high inter-operability from different

vendors.

The DM9161EP 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

DM9161EP 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 DM9161EP needs no external filter to transport signals to the

media in 100MBASE-TX or 10MBASE-T Ethernet operation.

Block Diagram

MII

Management

Control

Biasing/

Power

Block

Clock

Circuit

Block

100Base-TX

Transceiver

100Base-FX

PECL

Interface

LED Driver

MII/RMII/

GPSI

Interface

MII

Register

100Base-

TX

PCS

10Base-T

TX/RX Module

Auto-Negotiation