Throttled-buffer ATM switch output control circuitry with CAM-based multicast support

The shared buffer switch chip uses a CAM-access approach. Cells are uniquely identified by a combination of sequence number and port for unicasts, or sequence number and multicast identifier (MCI) for multicasts. A Tag CAM is used to search for these identifiers, and a control throughput of47 Mcell/...

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Bibliographic Details
Published in1997 IEEE International Solids-State Circuits Conference. Digest of Technical Papers Vol. 40; pp. 152 - 153
Main Authors Schultz, K.J., Gulak, P.G.
Format Conference Proceeding Journal Article
LanguageEnglish
Published IEEE 01.01.1997
Subjects
Aggregates
Asynchronous transfer mode
Bandwidth
CADCAM
Circuit testing
Computer aided manufacturing
Switches
Switching circuits
Throughput
Unicast
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Summary:The shared buffer switch chip uses a CAM-access approach. Cells are uniquely identified by a combination of sequence number and port for unicasts, or sequence number and multicast identifier (MCI) for multicasts. A Tag CAM is used to search for these identifiers, and a control throughput of47 Mcell/s is achieved. The multicast hardware employs a CAM (the McCAM) to query multicast destination bitmaps. Only one copy of both the tag and the cell is stored. The McCAM is searched for multicasts that are unobstructed by busy unicast ports. The McCAM also enables global multicast querying, so that multicast connections behind the head-of-line may be serviced.
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ISBN:9780780337213
0780337212
ISSN:0193-6530
2376-8606
DOI:10.1109/ISSCC.1997.585311