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DM9161BI

Industry-grade 10/100 Mbps Fast Ethernet Physical Layer Single Chip Transceiver

Davicom Semiconductor, Inc. 

DM9161BI

Industry-grade 10/100 Mbps Fast Ethernet Physical Layer Single Chip Transceiver

1. General Description

The DM9161BI is a Industrial-grade 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 DM9161BI connects to the Medium

Access Control (MAC) layer, ensuring a high inter

operability from different vendors.

The DM9161BI 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

Sub layer (PCS), Physical Medium Attachment (PMA),

Twisted Pair Physical Medium Dependent Sub layer

(TP-PMD),

10BASE-TX

Encoder/Decoder

(ENC/DEC), and Twisted Pair Media Access Unit

(TPMAU). The DM9161BI 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 DM9161BI 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 HP MDI/MDI-X auto crossover function

(HP Auto-MDIX)

„ 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 mask able 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 HP Auto-MDIX Enable.

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

„ Pin to pin Compatible with DM9161A.

„ DSP architecture PHY Transceiver.

„ Supports Industrial-grade: -40°C.~ +85'°C,

„ 48-pin LQFP 0.18um process

Preliminary

2

Version: DM9161BI-12-DS-P01

July 16, 2008

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