VITESSE

SEMICONDUCTOR CORPORATION

Data Sheet

VSC7140

1.0625 Gb/s Fibre Channel

Dual Repeater / Hub Node

G52180-0, Rev 4.0

Page 1

10/23/00

©

VITESSE SEMICONDUCTOR CORPORATION • 741 Calle Plano • Camarillo, CA 93012

Tel: (800) VITESSE • FAX: (805) 987-5896 • Email: prodinfo@vitesse.com

Internet: www.vitesse.com

Features

General Description

The VSC7140 is a dual Fibre Channel repeater which can be used in Hubs, JBODs or any Fibre Channel

Subsystem requiring clean incoming and outgoing signals at a bulkhead connector. The digital Clock Recovery

Unit (CRU) recovers incoming data from an external device, amplifies it and attenuates jitter. A digital Signal

Detect Unit (SDU) determines whether the incoming signal contains invalid Fibre Channel data. A 2:1 multi-

plexer forms a Port Bypass Circuit (PBC) to route either recovered incoming data or SI to SO.

Fibre Channel subsystems requiring signal cleanup at the bulkhead would connect RX1 to the incoming

signal and SO1 to the internal subsystem’s input. RX2 would connect to the output of the subsystem and SO2

would connect to the bulkhead.

For Hub applications, SI would connect to the previous Hub Node and output data to the external device on

TX. Incoming data from the external device on RX is recovered and cleaned up and passed to the next Hub

node on SO. If the external device is not functional, SI is passed to SO.

VSC7140 Block Diagram

• Supports ANSI X3T11 1.0625Gb/s, FC-AL

Disk Attach for Resiliency

• Dual Digital Clock Recovery Units

• Dual Digital Signal Detect Units

• Dual Port Bypass Circuits

• 106.25 or 53.125 MHz Reference Clock

• Implements 2 Hub Nodes

• Provides Bi-directional Signal Clean-up.

• 1.2 W Typical Power Dissipation

• 3.3V Power Supply

• 52-Pin, 10mm PQFP

RX1+

RX1-

SO1+

SO1-

SEL1

1

0

FAIL1-

TX1+

TX1-

SI1+

SI1-

RX2+

RX2-

SO2+

SO2-

1

0

TX2+

TX2-

SI2+

SI2-

1

0

SEL2

HUB

REFCLK

(106/53 MHz)

CMU

REFSEL

SDU1

CRU1

FAIL2-

SDU2

CRU2

ERRSEL

PBC2

PBC1

PBC3