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

Author

Schultz, K.J. ; Gulak, P.G.

Author_Institution

Nortel Semicond., Ottawa, Ont., Canada

fYear

1997

fDate

8-8 Feb. 1997

Firstpage

152

Lastpage

153

Abstract

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.

Keywords

asynchronous transfer mode; buffer storage; content-addressable storage; shared memory systems; switching circuits; 1 W; 95 MHz; CAM-access approach; CAM-based multicast support; control throughput; global multicast querying; multicast connection servicing; multicast destination bitmaps; multicast identifier; sequence number; shared buffer switch chip; tag CAM; throttled-buffer ATM switch output control circuitry; Aggregates; Asynchronous transfer mode; Bandwidth; CADCAM; Circuit testing; Computer aided manufacturing; Switches; Switching circuits; Throughput; Unicast;

fLanguage

English

Publisher

ieee

Conference_Titel

Solid-State Circuits Conference, 1997. Digest of Technical Papers. 43rd ISSCC., 1997 IEEE International

Conference_Location

San Francisco, CA, USA

ISSN

0193-6530

Print_ISBN

0-7803-3721-2

Type

conf

DOI

10.1109/ISSCC.1997.585311

Filename

585311