741 Calle Plano

Camarillo, CA 93012, USA

Tel: +1 805.388.3700

Fax: +1 805.987.5896

www.vitesse.com

The VSC8228 is a dual repeater/retimer for

Fibre Channel, Gigabit Ethernet, SONET/SDH,

and Infiniband applications. The VSC8228

contains dual FibreTimerTM clock recovery

units (CRU) for bidirectional signal conditioning in system

interconnect and serial backplane applications. The device

supports rates from 125 Mbps up to 4.25 Gbps. Using a single

reference clock for acquisition, the VSC8228 retransmits the

incoming serial data synchronously to the reference clock in

retimer mode or to the incoming data in repeater mode. In the

retimer mode, add/drop elasticity buffers insert/delete Fibre

Channel fill words to account for timing differences in the

incoming data and local reference clock.

An analog signal detect function is integrated into both

channels. In the retimer mode, the device monitors the

incoming data for run-length violations and K28.5- symbols.

The inputs on both the transmit and receive channels can be

looped back to the outputs of the opposite channels for

diagnostic purposes. The device provides a built-in pattern

generator and checker. An optional half-rate clock for SGMII

applications is provided on the receive channel output.

A high degree of signal integrity is maintained via differential

I/O, on-chip input and output terminations, input equalization,

and output de-emphasis. The programmable input equalization

circuit compensates for the frequency limitations of long

printed circuit board (PCB) traces, backplanes, connectors,

and cables. Equalization, de-emphasis, output drive levels,

data rate, and other features are configured through industry

standard serial interfaces (Two-wire or SPI).

The device may be powered from a single 1.2 V supply, single

1.8 V supply, or both a 1.2 V and 1.8 V supply. The 1.8 V supply

is required to meet the LVPECL output swing levels. The device

has current-mode logic (CML) inputs and outputs that can be

AC-coupled for LVPECL and LVDS compatibility. The IC is

packaged in a compact 10mm x 10mm, 64-pin TQFP package.

Typical power dissipation for a 1.2 V supply is 360 mW.

GENERAL DESCRIPTION:

APPLICA TION DIAGRAM:

VSC8228

For more information on Vitesse Products visit the Vitesse web site

at www.vitesse.com or contact Vitesse Sales at (800) VITESSE

or sales@vitesse.com

©2005 Vitesse Semiconductor Corporation

Vitesse, ASIC-Friendly, FibreTimer, TimeStream and Snoop Loop are trademarks of Vitesse Semiconductor Corporation.

All other trademarks or registered trademarks mentioned herein are the property of their respective holders. Vitesse

Semiconductor Corporation ("Vitesse") retains the right to make changes to its products or specifications to improve

performance, reliability or manufacturability. All information in this document, including descriptions of features,

functions, performance, technical specifications and availability, is subject to change without notice at any time.

Dual Channel Multirate Signal Conditioner and Retimer

Switch Fabric

Backplane

Line Card

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