the PD98402 implements the asynchronous transfer mode (atm) transmission convergence (tc) sublayer function in conformance with the atm forum specifications. this device allows for the trans- porting of atm cells over sonet/sdh networks at the sts-3c/stm-1 rate of 155.52 mbps. PD98402 atm/sonet (sts-3c) framer block diagram 83ng-9880b (1/94) receive pmd transmit atm bus interface signals oam interface signals receive atm transmit pmd serial/ parallel conversion scrambler/ descrambler receive overhead processor loopback pmd interface transmit/ receive fifo loopback atm interface transmit overhead processor control interface scrambler/ descrambler cell delineation cell hec generation/ verification ? all functionality required to insert and extract 53-byte atm cells into and out of sonet frames ? hec generation, verification, and correction ? receive/transmit fifos for cells buffering ? scrambling and descrambling, pointer processing, and frequency justification for sonet frames ? framing of incoming traffic bytes ? performance monitoring of interleaved parity bits and path status bytes ? insert/drop registers (soh: c1#1 to #3, f1, k2) (poh: f2, c2) for writing/reading of sonet overhead data ? standard operation and maintenance (oam) function to monitor network perfor- mance and provide alarm indication features ? utopia interface ? generic 8-bit microprocessor bus interface for configuration, control, and monitoring atm layer interface ? differential pecl signals for direct inter- face to an optical driver/receiver module ? serial data rate of 155.52 mbps and parallel (byte-wide) data rate of 19.44 mbps media interface ? atm adapter cards ? internetworking devices (bridges and routers) ? workstations and servers ? atm switches and hubs ? atm test equipment applications ? internal loopback at the media side and atm layer side ? access pins for self-testing ? low-power cmos technology (0.8-micron) ? 160-pin pqfp package general
voice data video 98yl-0168b (6/98) atm layer voice data video PD98402 pd98401 adaptation layer physical layer atm system architecture typical atm network interface card (atm-nic) fiber or utp s-bus/ pci/ vme/ others 98yl-0169b (6/98) atm controller pd98401 atm/sonet framer PD98402 bus i/f clk rec phy i/f control memory ? 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 limita tion 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 info rmation 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 r eactor control systems, and life-support systems. standard quality grade devices are rec- ommended for computers, office equipment, communication equipment, test and measurement equipment, machine tools, industrial ro bots, 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 custome r 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 de termine necels willingness to support a given application. document # s14197eu2v0pb00 for literature, call 1-800-366-9782 7 a.m. to 6 p.m. pacific time or fax your request to 1-800-729-9288 or visit our web site at www.necel.com
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