DM9161CI
10/100 Mbps Fast Ethernet Physical Layer Single Chip Transceiver
1. General Description
DAVICOM’s DM9161CI is a industrial-temperature
physical layer, low power, and single-chip 10BASE-
T/100BASE-TX transceiver specifically designed for
consumer electronics, industrial, and enterprise applications.
Through using a CMOS process, the DM9161CI has
the advantage of ensuring both high performance
and savings in power consumption.
Through utilization of automatic media speed and
protocol selection, the auto-negotiation function is
strongly supported in the DM9161CI. Then due to the
built-in wave shaping filter, the DM9161CI has a
significant convenience of not requiring an external
filter to transport signals to the media in 10BASE-T or
100BASE-TX during Ethernet operation.
2. Features
Fully complies with IEEE 802.3 / IEEE 802.3u 10Base-
T/ 100Base-TX, ANSI X3T12 TP-PMD 1995
standards
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
Through its Media Independent Interface (MII), the
DM9161CI not only connects the Medium Access
Control (MAC) layer but also ensure a high inter-
operability and flexibility for our different vendors. In
media usage applications, the DM9161CI provides a
direct interface either to an Unshielded Twisted Pair
Category 5 Cable (UTP5) for 100BASE-TX Fast
Ethernet, or an UTP5/UTP3 Cable for 10BASE-T
Ethernet. The DM9161CI contains the entire physical
layer functions of 100BASE-TX. Those physical layer
functions are defined by IEEE802.3u include 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).
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, Built in 3.3V to 1.8V
regulator
Lower Power consumption modes:
Power Reduced mode (cable detection)
Power Down mode
Supports industrial-temperature (-40℃ ~ +85℃)
Selectable TX drivers for 1:1 or 1.25:1 transformers for
additional power reduction . 1.25: 1 transformers only
when HP Auto-MDIX Disable.
Compatible with 3.3V and 5.0V tolerant I/Os
DM9161CIE pin to pin Compatible with DM9161AE /
DM9161BE
DSP architecture PHY Transceiver.
48-pin LQFP - 0.18um process
4
Final
Version: DM9161CI-DS-F01
February 22, 2012