© VITESSE SEMICONDUCTOR CORPORATION

Page 1

5/28/98

741 Calle Plano, Camarillo, CA 93012 • 805/388-3700 • FAX: 805/987-5896

VITESSE

SEMICONDUCTOR CORPORATION

Data Sheet

VSC7135

1.25Gbits/sec

Gigabit Ethernet Transceiver

G52146-0, Rev. 4.0

Features

General Description

The VSC7135 is a 1.25Gb/s Ethernet Transceiver optimized for Gigabit Ethernet or 1000Base-X applica-

tions. It accepts 10-bit 8B/10B encoded transmit data, latches it on the rising edge of REFCLK and serializes it

onto the TX PECL differential outputs at a baud rate which is ten times the REFCLK frequency. The VSC7135

also samples serial receive data on the RX PECL differential inputs, recovers the clock and data, deserializes it

onto the 10-bit receive data bus, outputs two recovered clocks at one-twentieth of the incoming baud rate and

detects “Comma” characters. The VSC7135 contains on-chip PLL circuitry for synthesis of the baud-rate trans-

mit clock, and extraction of the clock from the received serial stream. These circuits are fully monolithic and

require no external components.

VSC7135 Block Diagram

• Gigabit Ethernet Transceiver @ 1.25Gb/s

• Compliant to IEEE 802.3Z PMA

• TTL Interface Compatible to PMA-TBI

• Monolithic Clock Synthesis and Clock

Recovery - No External Components

• 125MHz TTL Reference Clock

• Low Power Operation - 700 mW

• Suitable for Both Coaxial or Optical Link

Applications

• 64 Pin, 14mm or 10mm Standard PQFP

• Single +3.3V Supply

RX+

RX-

Q D

Serial to

Parallel

Clock

Recovery

Retimed

Data

÷ 10

Recovered

Comma

Detect

Q D

R0:9

Frame

Logic

COM_DET

EN_CDET

T0:9

PLL Clock

Multiply

D Q

Parallel

to Serial

Serial Data

Clock

Synthesized

Clock

D Q

TX+

TX-

EWRAP

÷ 20

RCLK

Resync

10

10

REFCLK

2:1

RCLKN