78Q2120C Teridian Semiconductor Corp. (TDK Semiconductor), 78Q2120C Datasheet

78Q2120C

Manufacturer Part Number

78Q2120C

Description

10/100 Ethernet PHYS

Manufacturer

Teridian Semiconductor Corp. (TDK Semiconductor)

Datasheet

1.78Q2120C.pdf (33 pages)

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DESCRIPTION

The 78Q2120C 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 function.

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 for 100BASE-TX/10BASE-T and

Category-3 unshielded twisted pair for 10BASE-T,

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 an advanced CMOS process

for high performance and low power operation.

TXD[3:0]

RX_CLK

TX_CLK

RXD[3:0]

VCC

Registers

Interface

Logic

MII

GND

100M

10M

Manchester Decoder,

Manchester Encoder

5B/4B Decoder

Serial/Parallel

Descrambler,

4B/5B Encoder,

Parallel/Serial

Parallel/Serial,

Parallel/Serial

Scrambler,

BLOCK DIAGRAM

CKIN

Clock Reference

Collision Detect

25MHz

MLT3 Encoder

Carrier Sense,

TX CLK GEN

NRZ/NRZI

Recovery

CLK

FEATURES

•

LEDL

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 digital clock recovery

Automatic polarity correction during auto-

negotiation and 10BASE-T signal reception

Power-saving

including transmitter disable

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

FDX

User programmable Interrupt pin

64-Pin TQFP (JEDEC LQFP) package

Single 3.3 V ± 0.3V Supply

10/100BASE-TX Transceiver

LEDBT

LEDBTX

Pulse Shaper

MLT3 Decode, NRZI/NRZ

Baseline Wander Correct,

Negotiation

MLT3 Decode, NRZI/NRZ

and Filter

Auto

LEDFX

Adaptive EQ,

LEDs

LEDTX

10M

and

LEDRX

MDI

LEDCOL

100M

power-down

TXOP/N

RXIP/N

78Q2120C

August 2003

Rev_1.1

modes

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