NETWORK PRODUCTS
VSC8239
9.953 Gbps to 11.3 Gbps Dual XFP Signal Conditioner
BLOCK DIAGRAM:
LOLN
PIO4,
LOL_POL
RX_BYPSEL[ 3:0]
BYP
LOGIC
TX_LOL
RX_GAIN
RX_BOOST
DAC
DAC
RXFILT
DAC
RX_BW
RX_OC
DAC
Receive
Data Out
RD+
RD–
OD
CK/4
VGA
RX CDR
RXIN+
RXIN–
Receive
Data In
RX_BYPASS
RX_LT R
Offset
Correction
RX_OC_
LOOP_ENBL
LOS_ POL
LOS/LOT
REFCLK+
REFCLK–
HOST_ LPBCK/
RX_ D NV
I
LOS
RX_LOS
HOSTS IDE
PIO[4:0]
Serial
Interface
Control
TX_OC_
LOOP_ENBL
CTRL
Signals
Read back
Signals
Thr
TX_LOL
DAC
DAC
LINES IDE
SET/ CLR
Offset
Correction
Transmi t
Data In
TD+
TD–
LINE_LPBCK/
T X_DINV
TX_ LTR
TX CDR
VGA
DAC
DAC
DAC
TX_BOOST
TX_GAIN
TX_OC
TX_BW
DAC
CK/4
OD
BYP
L OGIC
TX_BYPASS
TX_ BYPSEL[ 3:0]
TXOUT+
TXOUT–
Transmit
Data Out
TXF
ILT
CDD12
F E AT U R E S :
4Small
size – 32-Pin, QFP (5 mm x 5 mm) package
49.953
Gbps to 11.3 Gbps operation
4Integrated
loopback functions
4Programmable
gain and equalization for Rx and Tx
4Two-wire
Serial Interface/SPI Serial Control Interface
410
mV typical input sensitivity
4Built
In Self Test (BIST) features including flexible error detection modes
4Full
XFP compliant jitter specifications
BENEFITS:
4Reduces
board space usage
4Continuous
tuning of the operation frequency without needing to select
between VCO
4Provides
on-chip line and diagnostic functions
4Allows
optical and XFI adaption of input signals for optimized sensitivity
and jitter performance
4Allows
serial access to internal control registers
4Provides
long-haul receive optical sensitvity
4Allows
for built in test signal generation of industry standard PRBS and
user defined-patterns coupled with a full rate error detection capability
4Fully
meets all XFP MSA SONET and datacom jitter specifications
including jitter generation, tolerance, and transfer
S P E C I F I C AT I O N S :
49.953
Gbps to 11.3 Gbps operation
410
mV typical input sensitivity
45
mm x 5 mm package
4Full
XFP compliant jitter specifications
4XFI
compliant IO specifications
41.8
V single power supply
4600
mW typical power dissipation
PB-VSC8239-001
VSC8239
9.953 Gbps to 11.3 Gbps Dual XFP Signal Conditioner
GENERAL DESCRIPTION:
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.
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.
A P P L I C AT I O N S :
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.
A P P L I C AT I O N D I A G R A M :
X FP Tra ns c e iv e r
VS C 7 9 8 6 R O S A
P
P in
in
T IA
D
D e
e c
c t
r
e t
te
to
VS C 7 9 7 8 /9
V S C7 9 8 5
Optica l
Inter face
Las e r
uC
C
V S C 7 9 8 2 /1 /0
E M L /D M L /V C S E L
DR IV E
DR IV E R R
Pos t A m p
+ CDR
V SC 8 23 3
D u a l Sign a l
C on d it ion er
C on
C D R + CU
EQ
XFI
Interface
H O S T A S IIC
S C
11 0 G
0G b
XC VR S
SFI4 -SO NET
VSC8 479
X AUI -10G b E/FC
XAUI -10Gb e/FC
VSC8476
XG MII-
10 Gb e/ FC
E/FC
VSC8478
VS C8 2 34 D u a l C DR w VC SEL Dr iver
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.
741 Calle Plano
Camarillo, CA 93012, USA
Tel: +1 805.388.3700
Fax: +1 805.987.5896
www.vitesse.com
sales@vitesse.com
京公网安备 11010802033920号
EEWORLD
