Lucent Technologies' ATLANTA ASwitch Core chip provides leading-edge,

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ATLANTA ASwitch Core Chip
Lucent Technologies' ATLANTA ASwitch Core chip provides leading-edge, highly integrated, innovative, comprehensive VLSI solution implementing complete functionality high-performance Aswitching systems. chip highly flexible modular, enabling design Aswitch optimized variety different applications, including Amultiplexor/concentrator, workgroup switch, backbone, enterprise, edge/access switches. chip enables construction nonblocking, feature-rich, costeffective Aswitching systems, scalable over wide range switching capacities, anywhere from Gbits/s Gbits/s throughput. With chip set, system designers greatly simplify their system development, dramatically reduce development expense product cost, significantly accelerate time market introduction. ATLANTA chip based novel architecture algorithms developed (several patented patent pending) Bell Labs. consists four components native support OC-12 ports. Only chips needed implement complete Acore Gbits/s Mbits/s Mbits/s switch (additional components completing system standard physical interface circuits, control CPU, standard, readily-available, low-cost SRAMs). modularity architecture allows system scaled higher capacities with repeated instances same four components, maintaining linear cost increment Gbits/s switch size (for example, Mbits/s Mbits/s system). chip designed highly flexible facilitating system differentiation through various configuration options, including fault tolerance capabilities, accommodation proprietary circuits aimed enhancements traffic network management.
Chip Description
highly integrated ATLANTA ASwitch Core chip consists four chips, fabricated lowpower CMOS technology, optimized operation with tolerant I/O:
LUC4AU01 Alayer manager (ALM) processes Mbits/s full-duplex Atraffic throughput. LUC4AB01 Abuffer manager (ABM) queues cells Mbits/s full-duplex Atraffic throughput. LUC4AS01 Aswitch element (ASX) switches ports Mbits/s Gbits/s total Athroughput) with on-chip 512-cell buffering. LUC4AC01 Acrossbar element (ACE) connects ports Mbits/s with variable size crossbars.
Figures show various application diagrams.
LUCENT TECHNOLOGIES-PROPRIETARY pursuant Company Instructions
Section
ATLANTA ASwitch Core Chip
Chip Features
ATLANTA chip features include following:
Four levels delay priorities port queue Programmable, weighted round-robin scheduling over four delay priorities Optimal, unrestricted multicasting algorithm with single copy storage Integrated support UTOPIA policing, congestion management, each port, independent configurability operation, switching, outbound VPI/VCI translation Extensive variety statistics maintained facilitate switch network management Supports cost-effective redundant fabric operation high degree fault-tolerance Allows special cell insertion extraction port management control Built-in boundary scan facilitating circuit board testing
Provides ATM-level functions implementing Aswitch (add only CPU, memory, port circuits) Nonblocking, high-performance system design Switch architecture scalable Gbits/s capacity with native support OC-12 switching fabric ports Mbits/s I/O) Supports 1200 1200 physical interface (MPHY) ports Allows independent, flexible design each switch port (line card), with support MPHY ports Transmits cells MPHY ports programmable line rates ranging from Mbits/s Mbits/s
connections (in/out-bound) fabric port (2.56 million connections maximum system) Scalable buffer size cells fabric port (1.28 million cells maximum system)
LINE CARD
SWITCH FABRIC CARD THREE-STAGE FABRIC (6-25 Gbits/s)
Mbits/s Mbits/s
MINIMUM SINGLE DEVICE FABRIC Gbits/s)
Section
UTOPIA MULTI-PHY
ALAYER MANAGER
ABUFFER MANAGER
A622 Mbits/s PORTS MODULE
ASWITCH ELEMENT
A622 Mbits/s PORTS MODULE
A622 Mbits/s PORTS MODULE
5-4917.r3
Figure Architecture 5-Gbits/s Larger ATLANTA-based ASwitch System
LUCENT TECHNOLOGIES-PROPRIETARY pursuant Company Instructions
Lucent Technologies Inc.
ATLANTA ASwitch Core Chip
pair also function complete core low-end Aswitch Mbits/s capacity with ports, organized shared memory switch Aconcentrator aggregation multiplexing applications. ATLANTA device provides complete Gbits/s Aswitch fabric core solution with on-chip shared memory, multi priority output queuing. conjunction with companion device, highperformance, nonblocking, lossless, self-routing switch fabrics with very large system bandwidth Gbits/s) constructed simple, modular cost-effective manner. Variable size switching fabrics implemented with three-stage network devices, replicated necessary provide ports organized into memory-spacememory (MSM) topology. other components required ATLANTA-based switch fabric. high fault-tolerance, redundant fabric operation supported. system timing clocking schemes ATLANTA chip facilitate robust design distributed chassis/backplane-based systems, desired larger switches, allowing independent line card clocks arbitrary clock skew introduced across backplanes between different line fabric cards. With builtin high-performance drivers, ATLANTA chip also provide glueless interface across backplane, reducing system cost.
System Architecture
ATLANTA switch system based distributed output controlled shared memory architecture with novel queueing structure algorithms internal routing, flow control, buffer management provide nonblocking, high-performance switching solution. enables system effectively maintain scalable shared buffers line rates, allowing commonly-available, low-cost SRAMs modularity port design, independent overall switch capacity. This allows almost linear buildup system cost highly desirable attribute), proportional number ports populated, even very large systems (e.g., Gbits/s). single pair ATLANTA devices offers feature-rich solution building Mbits/s fullduplex line cards (with MPHY interfaces) Aswitch (consisting separate switch fabric), providing complete functionality NNI) buffer management. number connections cell buffers supported each fabric port scaled arbitrarily adding appropriate number memory components. ALM/ABM-based line card designed operate with ATLANTA-based switch fabric card (see below), permitting port fabric interconnection without other support devices. Alternatively, flexibility ATLANTA line card interface also allows with other user proprietary fabric designs.
Lucent Technologies Inc.
LUCENT TECHNOLOGIES-PROPRIETARY pursuant Company Instructions
Section
ATLANTA ASwitch Core Chip
System Architecture (continued)
Mbits/s Mbits/s PORTS)
ALAYER MANAGER UTOPIA MULTI-PHY ABUFFER MANAGER
4-4916.r2
Figure Complete ATLANTA Two-Chip Solution Nonblocking, Low-End ASwitch Mbit/s Capacity)
PORTS
Section
ALAYER MANAGER Mbits/s RISER UTOPIA MULTI-PHY ABUFFER MANAGER
BACKBONE/ ENTERPRISE SWITCH
5-4915.r2
Figure ATLANTA-based AConcentrator with Local Switching Ports Aggregated into OC-3 Port)
LUCENT TECHNOLOGIES-PROPRIETARY pursuant Company Instructions
Lucent Technologies Inc.
ATLANTA ASwitch Core Chip
Notes
Lucent Technologies Inc.
LUCENT TECHNOLOGIES-PROPRIETARY pursuant Company Instructions
Section
ATLANTA ASwitch Core Chip
Product Brief July 1996
additional information, contact your Microelectronics Group Account Manager following: INTERNET: http://www.lucent.com/micro U.S.A.: Microelectronics Group, Lucent Technologies Inc., Union Boulevard, Room 30L-15P-BA, Allentown, 18103 1-800-372-2447, 610-712-4106 CANADA: 1-800-553-2448, 610-712-4106), e-mail docmaster@micro.lucent.com ASIA PACIFIC: Microelectronics Group, Lucent Technologies Singapore Pte. Ltd., Science Park Drive, #03-18 Cintech III, Singapore 118256 Tel. (65) 8833, (65) 7495 JAPAN: Microelectronics Group, Lucent Technologies Japan Ltd., 7-18, Higashi-Gotanda 2-chome, Shinagawa-ku, Tokyo 141, Japan Tel. (81) 5421 1600, (81) 5421 1700 data requests Europe: MICROELECTRONICS GROUP DATALINE: Tel. (44) 1734 299, (44) 1734 technical inquiries Europe: CENTRAL EUROPE: (49) 95086 (Munich), NORTHERN EUROPE: (44) 1344 (Bracknell UK), FRANCE: (33) (Paris), SOUTHERN EUROPE: (39) 6601 1800 (Milan) (34) 1700 (Madrid)
Lucent Technologies Inc. reserves right make changes product(s) information contained herein without notice. liability assumed result their application. rights under patent accompany sale such product(s) information.
Copyright 1997 Lucent Technologies Inc. Rights Reserved Printed U.S.A.
March 1997 PN96-068APrinted Recycled Paper

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