DM9161B
10/100 Mbps Fast Ethernet Physical Layer Single Chip Transceiver
Final 2
Version: DM9161B-12-DS-F01
January 31, 2008
1. General Description
The DM9161B 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 DM9161B
connects to the Medium Access Control (MAC) layer,
ensuring a high inter operability from different vendors.
TheDM9161B 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 DM9161B 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 DM9161B 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 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 HP Auto-MDIX Enable.
Compatible with 3.3V and 5.0V tolerant I/Os
Pin to pin Compatible with DM9161A.
DSP architecture PHY Transceiver.
48-pin LQFP 0.18um process
