VSC7140QJ Datasheet

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VITESSE

SEMICONDUCTOR CORPORATION

Data Sheet

VSC7140

Features

鈥?Supports ANSI X3T11 1.0625Gb/s, FC-AL

Disk Attach for Resiliency

鈥?Dual Digital Clock Recovery Units

鈥?Dual Digital Signal Detect Units

鈥?Dual Port Bypass Circuits

鈥?106.25 or 53.125 MHz Reference Clock

1.0625 Gb/s Fibre Channel

Dual Repeater / Hub Node

鈥?Implements 2 Hub Nodes

鈥?Provides Bi-directional Signal Clean-up.

鈥?1.2 W Typical Power Dissipation

鈥?3.3V Power Supply

鈥?52-Pin, 10mm PQFP

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鈥檚 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

FAIL1-

SEL1

SDU1

RX1+

RX1-

SI1+

SI1-

ERRSEL

SO2+

SO2-

1

0

TX2+

TX2-

REFSEL

REFCLK

(106/53 MHz)

CRU1

1

PBC1

SO1+

SO1-

TX1+

TX1-

0

CRU2

PBC2

SDU2

1

0

RX2+

RX2-

PBC3

SI2+

SI2-

CMU

SEL2

FAIL2-

HUB

G52180-0, Rev 4.0

10/23/00

漏

VITESSE

SEMICONDUCTOR CORPORATION

鈥?741 Calle Plano 鈥?Camarillo, CA 93012

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

Internet: www.vitesse.com

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