Reading or writing while searching in a CAM

Details Reading or writing while searching in a CAM Reading or writing while searching in a CAM

2005-07-26

2005-07-26

Sparks, Donald (Department: 2187)

Electrical computers and digital processing systems: memory

Storage accessing and control

Specific memory composition

C365S189040, C365S049130

Reexamination Certificate

active

06922751

ABSTRACT:
The present invention provides a content addressable memory (CAM) match search circuit that permits searching of the search circuit while accessing for reading from, writing to, or refreshing a match detection circuit within the search circuit. In accordance with an exemplary embodiment of the invention, rather than allowing the allowing the search circuit to search a match detection circuit being accessed, the match detection circuit is isolated and forced to indicate a mismatch. Furthermore, the contents of the match detection circuit are stored separately and subsequently searched.

REFERENCES:
patent: 5964857 (1999-10-01), Srinivasan et al.
patent: 6707693 (2004-03-01), Ichiriu
Zukowski, C. A, and Wang, S. Use of Selective Precharge for Low-Power on the Match Lines of Content-Addressable Memories. Proceedings., International Workshop on Memory Technology, Design and Testing, Aug. 11-12, 1997. pp. 64-68.
Ron White. How Computers Work. 2004, Que Publishing, 7th ed., pp. 49-51.

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