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VITESSE

SEMICONDUCTOR CORPORATION

Data Sheet

VSC870

Features

鈥?Performs 32-Bit Parallel to Serial and Serial to

Parallel Functions

鈥?Serial Data Rates are 2.0Gb/s

鈥?Designed in Conjunction with the VSC880 Serial

Crosspoint Switch

鈥?Performs Bit Alignment, Word Alignment and

Cell Alignment

鈥?Three Modes of Operation:

Distributed Control

Packet Mode,

Central

Control

Cell Mode

and

Direct Mode

鈥?Support for Multicast and Multiple Input Queues

High Performance Serial

Backplane Transceiver

鈥?Supports Priorities, Camp-on and

Retransmission Capability in Packet Mode

鈥?Built-in Flow Control Channel in Packet Mode

鈥?Supports Cell Synchronization in Cell Mode

鈥?Interfaces Directly with Industry Standard

FIFOs

鈥?Contains Redundant Serial I/Os and Internal

Loopback Mode

鈥?5V Tolerant TTL Inputs

鈥?Single 3.3V Power Supply

鈥?Available in 192 BGA Package

VSC870 Block Diagram

RFM

RTM/TCLK REN

WSIN

WSOUT

OOS

RESYNEN

RESET

Retiming

Register

TXIN[31:0]

TXTYP[1:0]

TXEN

RTR

ABORT

BYPASS

WCLK

TXOK

RXOK

SCRAM

Transmit

Control

SCRAM

Parallel

to

Serial

TXCLK

Generator

TXSA+/TXSA-

TXSB+/TXSB-

FACLPBK

Alignment

Word Gen

Word/Cell

Aligner

CMU

REFCLK

DLYEN/CCKIN

MODE[1]

MODE[0]

LOOPBACK

RXSA+/RXSA-

RXSB+/RXSB-

RXSEL

TESTEN

VSCTE

RXCLK

Generator

Register

Receive

Control

Retiming

RXWA

RXTYP[1:0]

RXOUT[31:0]

ACK/RCLK

Serial

to

Parallel

CRU

DeSCRAM

RXEN

Signal Detect

CELLSYN

ALIVE

LTIME

G52190-0, Rev 4.1

01/05/01

漏

VITESSE

SEMICONDUCTOR CORPORATION

鈥?741 Calle Plano 鈥?Camarillo, CA 93012

Tel: (800) VITESSE 鈥?FAX: (805) 987-5896 鈥?Email: prodinfo@vitesse.com

Internet: www.vitesse.com

Page 1

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