VSC8228
Dual Channel Multirate Signal Conditioner and Retimer
GENERAL DESCRIPTION:
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
A P P L I C AT I O N D I A G R A M :
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.
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).
generator and checker. An optional half-rate clock for SGMII
applications is provided on the receive channel output.
Optical
Module
VSC8228
Line Card
Switch
ASIC
Backplane
Switch Fabric
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.
741 Calle Plano
Camarillo, CA 93012, USA
Tel: +1 805.388.3700
Fax: +1 805.987.5896
www.vitesse.com
VITESSE [ VITESSE SEMICONDUCTOR CORPORATION ]
