DM9301F Product Brief

100Mbps Ethernet Fiber/Twisted Pair Single Chip Media Converter

June 2008 Rev.1.0

The DM9301 is a physical-layer, single-chip, low-power media converter for

100BASE-TX/FX full duplex repeater applications. On the TX media side, it provides

a direct interface to Unshielded Twisted Pair Cable 5 (UTP5) for 100BASE-TX Fast

Ethernet. On the FX media side, it provides a direct interface to a Pseudo Emitter

Coupled Logic level interface (PECL).

The DM9301 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) and a PECL compliant

interface for a fiber optic module, compliant with ANSI X3.166. The DM9301

provides two independent clock recovery circuits to minimize bit delay through the

converter (no FIFO are used to buffer data between the FX and TX interfaces).

Furthermore, due to the excellent rise/fall time control by a built-in wave-shaping

filter, the DM9301 needs no external filter to transport signals to the media on the

100Base-TX interface.

Patent-Pending Circuits: Smart adaptive receiver equalizer

‧

Digital algorithm for high frequency clock/data recovery circuit

‧

High speed wave-shaping circuit

Block Diagram

TX Code-

group

Alignment

Monitor

Descrambler

Serial to

Parallel

NRZI

to

NRZ

RX

CRM

MLT-3 to

NRZI

Adaptive

EQ

CGM

125M TPRXCLK

25M TPRXCLK

25M

OSC/XTAL

TPRXI+/-

Parallel

to Serial

FX Code-

group

Alignment

Monitor

Serial to

Parallel

RX

CRM

Scrambler

Parallel

to Serial

NRZ

to

NRZI

NRZI to

MLT-3

MLT-3

Driver

TPTXO+/-

Rise/Fall

Time

CTL

25M FXRXCLK

125M FXRXCLK

PECL

TXMT

PECL

RCVR

PECLRXI +/-

PECLTXO +/-

FXSD

RCVR

Link Status

Monitor &

LED Driver

PECLSD

NRZ

to

NRZI

NRZI

to

NRZ