CAM accelerated buffer management

Details CAM accelerated buffer management CAM accelerated buffer management

1996-02-09

1997-12-09

Asta, Frank J.

Boots, shoes, and leggings

395481, 395823, 395825, 39542102, 3954211, 39542104, 395412, 364DIG1, G06F 1300

Patent

active

056969309

ABSTRACT:
A method and apparatus for managing effectively data and command buffers in an I/O subsystem utilizes a content addressable memory (CAM) array (36) having a plurality of CAM storage locations (SL1 . . . SLn). The CAM array is used to store a plurality of SCSI Nexus entries and generates a unique address pointer when there is a match between an incoming SCSI Nexus value and one of the plurality of SCSI Nexus entries. A command buffer (24) or user data buffer (26) is responsive to the unique address pointer for storing and retrieving the command/data section of a Command Control Block in a corresponding one of a plurality of buffer storage locations. As a result, the host CPU (12) or adapter (22) is relieved of much of the overhead associated with managing these buffers.

REFERENCES:
patent: 4149239 (1979-04-01), Jenkins et al.
patent: 4758982 (1988-07-01), Price
patent: 5317708 (1994-05-01), Edgar
patent: 5428759 (1995-06-01), Smith et al.
patent: 5440709 (1995-08-01), Edgar
patent: 5537623 (1996-07-01), Chamberlain et al.
IBM Technical Disclosure Bulletin, vol. 31, No. 10 Mar. 1989, pp. 92-93.

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