DM9101
10/100Mbps Ethernet Physical Layer Single Chip Transceiver
Final
1
Version: DM9101-DS-F03
July 22, 1999
General Description
The DM9101 is a physical-layer, single-chip, 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 IEEE 802.3u Media
Independent Interface (MII), the DM9101 connects to the
Medium Access Control (MAC) layer, ensuring a high inter-
operability among products from different vendors.
The DM9101 uses a low-power and high-performance
CMOS process. It contains the entire physical layer
functions of 100Base-TX as defined by IEEE 802.3u,
including the Physical Coding
Sublayer (PCS), Physical Medium Attachment (PMA),
100Base-TX Twisted Pair Physical Medium Dependent
Sublayer (TP-PMD), and a 10Base-T Encoder/Decoder
(ENC/DEC). The DM9101 provides strong support for the
Auto-negotiation function utilizing automatic media speed
and protocol selection. The DM9101 incorporates an
internal wave-shaping filter to control rise/fall time,
eliminating the need for external filtering on the 10/100Mbps
signals.
Patent-Pending Circuitry Includes:
Smart adaptive receiver equalizer
Digital algorithm for high frequency clock/data recovery
circuit
High speed wave-shaping circuit
Block Diagram
MII
Signals
MII
Interface/
Control
4B/5B
Encoder
4B/5B
Decoder
Register
Code-
group
Alignment
Descrambler
Serial to
Parallel
NRZI
to
NRZ
RX
CRM
MLT-3 to
NRZI
Adaptive
EQ
Digital
Logic
Scrambler
Parallel
to Serial
NRZ
to
NRZI
NRZI to
MLT-3
MLT-3
Driver
Rise/Fall
Time
CTL
TX CGM
LED
Driver
Collision
Detection
Carrier
Sense
Auto-
Negotiation
10BASE-T
Module
RX
TX
125M CLK
25M CLK
LED1-4#
25M OSCI
RXI+/-
RXI+/-
10TXD+/-
100TXD+/-
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