DM9161A
10/100 Mbps Fast Ethernet Physical Layer Single Chip Transceiver
3
Preliminary
Version: DM9161A-DS-P04
Jan. 19, 2005
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
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