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
Specifications
Fully complies with IEEE 802.3u 10Base-T/100Base-TX/FX
Support Auto-Negotiation function, compliant with IEEE 802.3u
Fully integrated Physical layer single chip with direct interface to magnetic
Integrated 10Base-T and 100Base-TX transceiver
Selectable repeater or node mode
Far end fault signaling option in FX mode
Selectable MII or RMII (Reduced MII) interface, at he 100BASE-TX
Selectable GPSI (7-Wired) or MII mode at the 10Base-T.
Selectable twisted-pair or fiber mode output
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.
Single low power Supply of 3.3V with 0.35µm 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.
Compatible with 3.3V and 5.0V tolerant I/Os
48-pin LQFP small package (1x1 cm)
Application
 VoIP CPE (ATA, IP Phone, Video Phone)
 IP STB, IPC, Internet Radio
 IP CAM, DVR, Router…
Ordering Information
Part Number Pin Count Package
DM9161E 48 LQFP
DM9161EP 48 LQFP(Pb-Free)
DAVICOM Semiconductor, Inc.
No.6, Li-Hsin Rd.VI, Science Park, Hsin-Chu, Taiwan, R.O.C.
TEL: 886-3-5798797
FAX: 886-3-5646929
E-mail: sales@davicom.com.tw