P D 9 8 4 0 8 AT M P H Y S I C A L I N T E R FA C E
F E A T U R 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
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/descram-
bler, 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.
B U S I N T E R F A C E
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
M E D I A I N T E R F A C E
Supports STP and UTP (categories 3, 4 and 5) cable types
G E N E R A L
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
B L O C K D I A G R A M
A P P L I C A T I O N S
ATM concentrators/multiplexers
ATM switches/hubs
WAN access devices
CPU Bus
FM96-0889C (5/96)
JTAG Interface
PD98408
Transmit Clock (32 MHz)
PMD
TC
ATM
25.6 Mbps
UTP-3
ATM Layer
Loop-Back
PMD Loop-Back 1
PMD Loop-Back 2
Receive
FIFO
Transmit
FIFO
Receive
Data
Transmit
Data
UTOPIA
Level 2
CPU Interface
Test Interface
Transmitter
Clock & Data
Recovery
NRZI
Decoder
NRZI
Encoder
4B/5B Encoder
(Command-Byte
Insertion)
Descrambler
4B/5B Decoder
(Command-Byte
Detection)
Scrambler
HEC
Generation
UTOPIA Interface
HEC
Verification
Idle/Unassigned
Cell Detector
Equalizer
Receiver
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 rec-
ommended 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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