VITESSE VSC837 Datasheet

3.2Gb/s Crosspoint Switch with Input Signal Activity Monitoring

Physical

Layer

Products

Features:

• Input Signal Monitoring (ISA)

• Integrated Signal Equalization

(ISE) for Deterministic Jitter Reduction

• Selectable On-Die I/O

Termination

VSC837

Product Brief

• Hard and Soft Power Down

Modes for Unused Channels

• TTL/2.5V CMOS Control I/O

(3.3V Tolerant)

• Non-Blocking Architecture

with Broadcast and Multicast Capabilities

Specifications:

• 68 Input by 68 Output

Crosspoint Switch

• 3.2Gb/s NRZ Data Bandwidth

• 66MHz Multi-Mode

Programming Port

• Differential CML Output Driver

• 11W typ/14W max (low drive

mode),13W typ/16W max (high drive mode)

• Single 2.5V Supply

• High Performance 37.5mm,

480 TBGA Package

General Description

Supporting Forward Error Correction at data rates to 3.2Gb/s, the VSC837 completes the industry’s broadest Crosspoint switch family . In addition to leading edge performance, the VSC837 provides enhanced flexibility with multiple programming modes, user selectable input and output termination configurations, programmable output levels and Input Signal Activity monitoring to allow in-system diagnostics.

The VSC837 is a monolithic 68x68 asynchronous crosspoint switch, designed to carry broadband data streams. The non-blocking switch core is programmed through a triple-mode port interface that allows random access programming of each input/output port. A high degree of signal integrity is

maintained throughout the chip via fully differential signal paths. The crosspoint function is based on a multiplexer array architecture. Each data output is driven by a 68:1 multiplexer that can be programmed to one and only one of its 68 inputs. The signal path is unregistered and fully asynchronous, so there are no restrictions on the phase, frequency , or signal pattern at each input.

Each high-speed output is a fully differential switched current driver with switchable on-die terminations for maximum signal integrity. Data inputs are terminated on die through 100W resistors between true and complement inputs.

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3.2Gb/s Crosspoint Switch with

68x69 Switch Core

Core Program Registers

Program Memory

Program Interface

Y, YN[0:67]A, AN[0:67]

Act. Mon.

SERIAL

SDOUT

BURST

CSB

LOAD

ALE_SCN

ACTCLK

ACTIVITY

CONFIG

OUTPUT

INITB

OUTCHAN

[18:0]

INCHAN [6:0]

Input Signal Activity Monitoring

VSC837

Product Brief

VSC837 Jitter Performance

Vitesse continues its history of adding innovative features to its extensive Crosspoint Switch product family. Vitesse’s new crosspoint switches will incorporate novel, proprietary functionality called Integrated Signal Equalization switching matrix

ISE switch to reduce or eliminate the effects of Inter-Symbol Interference (ISI) that can occur in applications that use long, narrow PCB traces to route the incoming signal. This “jitter eating” capability results in less output jitter when the incoming jitter is deterministic in nature. ISE also facilitates the development of three stage CLOS switch fabrics by improving the three pass performance of the crosspoint switch.

(ISE) on every input to the

enables the crosspoint

A triple-mode programming interface is provided that allows programming commands to be sent as serial data or one of two forms of parallel data. The input-referred mode (burst mode) allows an input port to be routed to all outputs in only 4 program cycles. Core programming can be random for each port address, or multiple program assignments can be queued and issued simultaneously. The programming may be initialized to a “straightthrough” configuration (A0 to Y0, A1 to Y1, etc.) using the INITB pin.

Physical

Layer

Products

OutputInput

VSC837 Block Diagram

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An activity monitor is provided to allow in-system diagnostics. The activity monitor can observe any high-speed input via an internal 69th multiplexer.

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

and the Vitesse logo

of Vitesse Semiconductor Corp;oration

are all registered trademarks