DM9301 datasheet(10/22 Pages) ETC

10 / 22 page

DM9301

100Mbps Ethernet Fiber/Twisted Pair Single Chip Media Converter

Final

Version: DM9301-DS-F02

May 8, 2000

Functional Description

The DM9301 Fast Ethernet single-chip TX/FX media

converter, provides the functionality as specified in

IEEE802.3, integrates the complete 100BASE-TX and a

PECL optic module interface for 100Base-FX. The

DM9301 implements the PCS, PMA, and TP-PMD

sublayer functions, as defined by specification. The term

“X” will be used to describe the sections used in the fiber

PHY layer interface. The term “X” will be used to describe

the sections used in the twisted-pair PMD layer interface.

100BASE-FX to TX Operation

The block diagram in figure 1 provides an overview of the

functional blocks contained in the FX to TX media

converter interface.

The FX to TX interface includes the following functional

blocks:

•

FX PECL Receiver

•

FX Receiver Clock Recovery Module

•

FX NRZI to NRZ Converter

•

FX Serial to Parallel Converter

•

FX Code Group Alignment Monitor

•

TX Scrambler

•

TX Parallel to Serial Converter

•

TX NRZ to NRZI Converter

•

TX NRZI to MLT-3 Converter

•

TX MLT-3 Driver

FX PECL Receiver

The PECL receiver receives NRZI encoded, differential

Pseudo Emitter Coupled Logic level signal. The receiver

converts the receive signal into a single-ended NRZI

signal and presents this signal to the FX Clock Recovery

Module.

FX Receiver Clock Recovery Module

The FX Clock Recovery Module accepts NRZI data from

the PECL receiver. The FX Clock Recovery Module locks

onto the data stream, using a Phase Lock Loop (PLL) and

extracts the 125Mhz reference clock. The extracted and

synchronized clock and data are presented to the FX

NRZI to NRZ Decoder.

FX NRZI to NRZ Converter

The receive data stream is required to be NRZI encoded

for compatibility with the standards for 100Base- FX. This

conversion process must be reversed on the transmit end.

The FX NRZI to NRZ decoder, receives the NRZI

data stream from the FX Clock Recovery Module

and converts it to a NRZ data stream to be

presented to the FX Serial to Parallel conversion

block.

CGM

25M

OSC/XTAL

FX Code-

group

Alignment

Monitor

FX Serial

Parallel

CRM

Scrambler

Parallel

to Serial

NRZ

NRZI

NRZI to

MLT-3

Driver

TPTXO+/-

Rise/Fall

Time

CTL

25M FXRXCLK

125M FXRXCLK

PECL

RCVR

PECLRXI +/-

FXSD

RCVR

FX Link

Status

Monitor

PECLSD

NRZI

NRZ

FX to TX Block Diagram

Figure 1

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