User-Selectable, On-chip Receive Termination at Either 100
or 150
Speed Independent Tx and Rx Paths Aid in Fibre Channel
Auto-Speed Negotiation
World-class Signal Integrity for Jitter Compliance Reduces
Debug and Redesign Efforts
Two Digital/Analog Signal Detect Units to Detect the Presence
of Valid Fibre Channel Encoded Serial Data Improves Signal
Detect Reliability
User Selectable Pre-emphasis on all High-speed Outputs
Compensates for Deterministic Jitter Due to Long Traces
and Cables
106.25MHz or 125MHz Reference Clock
5V-tolerant LVTTL Inputs Provides Design Flexibility and
Backward Compatibility
Cable Equalization on all High-speed Inputs Reliably
Recovers Jittery Signals
Single 2.5V Supply Reduces Wiring Complexity
64-pin, 10x10mm TQFP Package Ideal for High Density
Designs
F E A T U R E S :
Two FibreTimerTM Cells Configurable as:
- Repeaters for Low Latency
- Retimers for True Fibre Channel Compliance
- Provides Design Flexibility by Allowing Mixing and Matching
of the Functions for Design Optimization
Digital Design of the FibreTimers Produce a Device that is
Well Controlled Over Voltage, Process and Temperature
Variations Provides a More Robust and Reliable Design
Supports Both 1.0625 Gb/s and 2.125 Gb/s Fibre Channel
Data Rates Dual Mode Provides Flexibility by Having One
Device for New and Legacy Designs
Supports 1.25 Gb/s Data Rates for Gigabit Ethernet Applications
VSC7142 Dual Repeater/Retimer for Fibre Channel and Gigabit Ethernet
DATACOM PRODUCTS
PB-VSC7142-001
VSC7142
B L O C K D I A G R A M :
1
0
MUX2
MUX0
MUX3
0
1
MUX1
0
1
1
0
Fibre
Timer0
I0+
I0
-
I1+
I1
-
Fibre
Timer1
O0+
O0
-
O1+
O1
-
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
2003 Vitesse Semiconductor Corporation
741 Calle Plano
Camarillo, CA 93012, USA
Tel: +1 805.388.3700
Fax: +1 805.987.5896
www.vitesse.com
VSC7142 Dual Repeater/Retimer for Fibre Channel and Gigabit Ethernet
VSC7142
The VSC7142 contains two FibreTimer Repeater /Retimer
cells and Signal Detect Units (SDUs) primarily used for
bidirectional signal clean up applications. Each FibreTimer
cell contains an all-digital clock recovery unit which can be
configured as either a Repeater or a Retimer. Repeaters
recover the incoming signal and retransmit the data
synchronously to the recovered clock in order to attenuate jitter so that downstream
devices see high amplitude, low jitter signals. Retimers eliminate jitter transfer by
retiming the recovered data to the local reference clock. An add/ drop FIFO inserts or
deletes 40-bit Fibre Channel Fill Words to match the incoming data rate to the local
reference clock, thereby ensuring Fibre Channel compliance at the output of the
Retimer. The VSC7142 also operates as a Repeater for Gigabit Ethernet applications at
1.25 Gb/s. Retimer mode is not available for Gigabit Ethernet applications.
M U L T I - N O D E S W I T C H A P P L I C A T I O N :
One application for the VSC7142 is in high port-count Fibre Channel and Ethernet
systems, such as switches. The following diagram shows a switch with a CMOS
protocol ASIC with integrated Serializer/Deserializers (SerDes) located on the Switch
Fabric card. Serial data from the protocol ASIC passes through multiple connectors
and long traces on the PCB before reaching the connector. Without the VSC7142, the
signal quality at the connectors would result in poor system performance. However,
by using the VSC7142, signal quality is ensured to meet the specifications of Fibre
Channel standards at the system interface connectors.
G E N E R A L D E S C R I P T I O N :
Fibre Channel Switch
Switch ASIC
Switch Fabric Card
Li ne Card
C onnectors
VSC7142
Backplane
Port 1
FibreTimer0 >
< FibreTimer1
Port N
PDF 
ZIP