GENERAL DESCRIPTION:

9.953 Gbps to 11.3 Gbps Dual XFP Signal Conditioner

VSC8239

The Transmit (Tx) data path consists of a Variable Gain Amplifier

(VGA) with a programmable EQ function. The VGA and EQ are

digitally controlled through the Two-wire Serial Interface/SPI

interface and allow for application specific jitter generation

optimization. A PLL-based CRU drives the 50 ohms Tx data driver

with levels compatible with available laser driver IC’s. The Tx LOL

alarm signal is supported.

Leveraging off the integration of transmit and receive path, the

VSC8239 device provides diagnostics and line loopback modes that

enable advanced XFP module level features such as a Built In Self

Test (BIST) feature with programmable error detection capability. This

facilitates high volume module manufacturing and system level setup.

It has a continuously tunable operating range from 9.9 Gbps to 11.3

Gbps supporting OC-192 (9.953 Gbps), 10 GbE (10.3 Gbps), 10 Gbps

Fibre Channel (10.5 Gbps), OC192FEC (10.709 Gbps), 10 GbE + FEC

(11.05 Gbps), and 10 Gbps Fibre Channel + FEC (11.3 Gbps) data rates.

741 Calle Plano

Camarillo, CA 93012, USA

Tel: +1 805.388.3700

Fax: +1 805.987.5896

www.vitesse.com

sales@vitesse.com

Trademarks ™

Vitesse, ASIC-Friendly, FibreTimer, TimeStream, Snoop Loop, Super FEC, FOCUSConnect, Meigs-II, Meigs-IIe, Lansing, Campbell-I, Barrington, PaceMaker, HOVCAT48,

HOVCAT48e, HOVCAT192, HOVCAT192e, Micro PHY, FOCUS32, FOCUS16, IQ2200, VersaCAT, GigaStream, HawX, SparX, StaX, VstaX, SimpliPHY,VeriPHY, ActiPHY, XFP PRO, SFP

PRO, Smart-LINK, OctalMAC, EQ Technology are trademarks in the United States and/or other jurisdictions of Vitesse Semiconductor Corporation. All other trademarks or

registered trademarks mentioned herein are the property of their respective holders.

Copyright © 2005

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. While the information furnished herein is held to be accurate and reliable, no responsibility will be assumed by Vitesse for its use. Furthermore, the information contained

herein does not convey to the purchaser of microelectronic devices any license under the patent right of any manufacturer.

APPLICA TIONS:

Fully compatible with the complete family of Vitesse XFP module

application products including 10 Gbps SERDES, Host ASIC family:

VSC8476, VSC8478, VSC8479, and 10 Gbps laser drivers and TIAs:

VSC7980, VSC7981, VSC7982, VSC7985, VSC7978, and VSC7979.

APPLICA TION DIAGRAM:

The VSC8239 device is a dual 10 Gbps Clock-

and-Data-Recovery unit (CDR) designed for

use as a signal conditioner IC for XFP

modules. This 5 mm x 5 mm single chip

solution has advantages of cost, size, and

feature set over existing two chip solutions.

A two-wire serial interface provides versatile

control and alarm access.

Each CDR is dedicated to supporting the corresponding

transmit and receive path as specified in the XFP MSA

standard. The Receive (Rx) data path consists of a limiting

amplifier

with

offset

correction

and

programmable

Equalization (EQ) function, followed by a Clock Recovery Unit

(CRU), Phase-Locked Loop (PLL), and a XFI compliant data

output driver. Rx Loss of Signal (LOS) and Rx Loss of Lock

(LOL) alarm signals are also supported to provide full

compliance to the XFP standard.

Las e r

DR IV E R

HO S T A S IC

10G b

XC VR S

SFI4 -SO N ET

VSC8 479

XAUI -10G b e/ FC

VSC 8476

XG MII -

10 Gb e/ FC

VSC 8478

uC

VSC 8 23 3

Du a l Sign a l

Con d it ion er

Las e r

X FP Tr ans c eiver

DR IV E R

HO S T A S I C

10 G

XC VR S

SFI4 -SO N ET

VSC8 479

XAUI -10Gb E/ FC

VSC 8476

XG MII -

10 Gb E/ FC

VSC 8478

C

VSC 8 23 3

Du a l Sign a l

Con d it ion er

Pos t A m p

+CDR

VS C 7 9 8 6 R O S A

Pin

De t e c t

CDR+ C U

EQ

VS C 7 9 8 6 R O S A

TIA

VS C 7 97 8/ 9

VS C 8 234 D u al C DR w VC SEL D r iv er

XFI

Interface

Opt ic a l

Int er fac e

Pin

De te c t o r

VS C 7 9 8 5

V S C 7982 / 1/ 0

EM L / D M L / VC SEL

V S C 7982 / 1/ 0

EM L / D M L / VC S