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78Q2120

10/100BASE-TX Ethernet Transceiver

TDK Corporation 

DESCRIPTION

The 78Q2120 is a 10BASE-T/100BASE-TX Fast

Ethernet transceiver. It includes integrated MII,

ENDECs, scrambler/descrambler, dual-speed clock

recovery, and full-featured auto-negotiation

functions. The transmitter includes an on-chip pulse-

shaper and a low-power line driver. The receiver has

an adaptive equalizer and a baseline restoration

circuit required for accurate clock and data recovery.

The transceiver interfaces to Category-5 unshielded

twisted pair (Cat-5 UTP) cabling, and is connected to

the line media via 1:1 isolation transformers. No

external filter is required. Interface to the MAC is

accomplished through an IEEE-802.3 compliant

media independent interface (MII). The product is

fabricated in a BiCMOS process for high

performance and low power operation, and can

operate from a single 3.3 V or 5 V supply.

78Q2120

10/100BASE-TX

Ethernet Transceiver

FEATURES

April 2000

• 10BASE-T/100BASE-TX IEEE-802.3 compliant TX

and RX functions requiring a dual 1:1 isolation

transformer interface to the line

• Integrated MII, 10BASE-T/100BASE-TX ENDEC,

100BASE-TX scrambler/descrambler, and full-

featured auto-negotiation function

• Full duplex operation capable

• PCS Bypass supports 5-bit symbol interface

• Dual speed clock recovery

• Automatic polarity correction during auto-

negotiation and 10BASE-T signal reception

• Power-saving and power-down modes including

transmitter disable

• BiCMOS technology, operates with a single 3.3V or

5V supply

• LED indicators: LINK,TX,RX,COL,100,10,FDX

• User programmable Interrupt pin

• General Purpose I/O Interface (80-pin package

only)

• 64 and 80-Lead TQFP (JEDEC LQFP),

64-Pin QFP packages

BLOCK DIAGRAM

Transmit

100M

4B/5B Encoder,

Scrambler,

Parallel/Serial

MII Serial

Management

& Control

MII

Registers

&

Interface

Logic

10M

Parallel/Serial,

Manchester Encoder

Manchester Decoder,

Serial/Parallel

Receive

Serial/Parallel,

Descrambler,

5B/4B Decoder

NRZ/NRZI,

MTL3 Encoder

TX Clock

Generator

Pulse Shaper

& Filter

UTP

Drivers

TXOP

TXON

Carrier Sense,

Collision Detect

Auto

Negotiation

Clock

Recovery

Clock

Reference

Adaptive EQ,

Baseline Wander Corrector,

MLT3 Decoder,

NRZI/NRZ

LEDs

10M

UTP

Receiver

100M

LINK

TX

RX

COL

100BT

10BT

FDX

RXIP

RXIN

CKIN

Vcc

Ground

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