5PD98408 Datasheet

ATM Physical Interface


Features, Applications

The �PD98408 incorporates six 25.6 Mbps ATM physical interface circuits (ports) into a single chip, implementing complete physical layer functionality for transmission convergence (TC) and physical media dependent (PMD) sublayer functions. Each port has an encoder/decoder, scrambler/descrambler, line equalizer, and clock recovery circuit for totally independent channel operation. This device communicates with ATM layer devices using an integrated UTOPIA level 2 standard interface.

E S Complies with the ATM Forum Specifications for 25.6 Mbps ATM interface Integrates six independent 25.6 Mbps physical interface circuits (ports) Performs NRZI and 4B/5B encoding and decoding functions Performs scrambler/descrambler, HEC generation/verification, and command byte insertion/detection functions Integrates an independent clock recovery and line equalizer circuit for each port Supports Operation and Maintenance (OAM) functions, including the detection of loss of signal (LOS), HEC errors, and 4B/5B code violations

BUS INTERFACE Uses the UTOPIA level 2 standard to ensure compatibility with multivendor ATM layer devices Provides a generic processor interface for device programming/option selection and status data gathering

MEDIA INTERFACE Supports STP and UTP (categories 3, 4 and 5) cable types

GENERAL Provides diagnostic capabilities: loopback of receive data at the physical side and transmit data at the UTOPIA interface, test signal generation and error insertion option Supports JTAG Boundary Scan Low-power CMOS technology (3.3-volt supply voltage) 208-pin plastic QFP package

4B/5B Encoder (Command-Byte Insertion) Transmit Data Transmit FIFO

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� 1998 NEC Electronics Inc. NEC is either trademarks or registered trademarks of NEC Corporation in the United States and/or other countries. All other trademarks are the property of their respective owners. No part of this document may be copied or reproduced in any form or by any means without the prior written consent of NEC Electronics Inc. (NECEL). The information in this document is subject to change without notice. ALL DEVICES SOLD BY NECEL ARE COVERED BY THE PROVISIONS APPEARING IN NECEL TERMS AND CONDITIONS OF SALES ONLY, INCLUDING THE LIMITATION OF LIABILITY, WARRANTY, AND PATENT PROVISIONS. NECEL makes no warranty, express, statutory, implied, or by description, regarding information set forth herein or regarding the freedom of the described devices from patent infringement. NECEL assumes no responsibility for any errors that may appear in this document. NECEL makes no commitments to update or to keep current information contained in this document. The devices listed in this document are not suitable for use in applications such as, but not limited to, aircraft control systems, aerospace equipment, submarine cables, nuclear reactor control systems, and life-support systems. "Standard" quality grade devices are recommended for computers, office equipment, communication equipment, test and measurement equipment, machine tools, industrial robots, audio and visual equipment, and other consumer products. For automotive and transportation equipment, traffic control systems, and anti-disaster and anti-crime systems, it is recommended that the customer contact the responsible NECEL salesperson to determine the reliability requirements for any such application and any cost adder. NECEL does not recommend or approve use of any of its products in life-support devices or systems or in any application where failure could result in injury or death. If customers wish to use NECEL devices in applications not intended by NECEL, customers must contact the responsible NECEL salespeople to determine NECEL's willingness to support a given application. Document # S11641EU2V0PB00



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