GENERAL DESCRIPTION

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.

FEATURES

? Two FibreTimer? 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

? User-Selectable, On-chip Receive Termination at Either 100Ω

or 150Ω

? 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