Network processor with content addressable memory (CAM) mask

Details Network processor with content addressable memory (CAM) mask Network processor with content addressable memory (CAM) mask

2007-10-09

2007-10-09

Bragdon, Reginald (Department: 2189)

Electrical computers and digital processing systems: memory

Storage accessing and control

Specific memory composition

C711S160000

Reexamination Certificate

active

10882830

ABSTRACT:
According to embodiments of the present invention, a network processor includes a content addressable memory (CAM) unit having CAM arranged in banks and sharable among microengines. In one embodiment, a mask having a value is used to select/enable one group of CAM banks and to deselect/disable another group of CAM banks. A tag may be looked up in the selected/enabled CAM banks based on the mask value. Upon a “miss,” the CAM banks provide the least recently used (LRU) entry. A LRU entry reelection tree may reelect the LRU entry from among all the CAM banks.

REFERENCES:
patent: 6643737 (2003-11-01), Ono
patent: 6697276 (2004-02-01), Pereira et al.
patent: 6831850 (2004-12-01), Pereira et al.
patent: 2005/0038964 (2005-02-01), Hooper et al.
Intel Corporation, “Intel® Internet Exchange Architecture Portability Framework,” Developer's Manual, Apr. 2006, pp. 1-142.
Intel Corporation, “Intel® IXP2800 Network Processor,” Hardware Reference Manual, Jul. 2005, pp. 1-406.

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