Match line precharge circuits and methods for content...

Details Match line precharge circuits and methods for content... Match line precharge circuits and methods for content...

2008-06-27

2010-12-14

Ho, Hoai V (Department: 2827)

Static information storage and retrieval

Associative memories

Compare/search/match circuit

C365S049100, C365S049110, C365S049160, C365S203000

Reexamination Certificate

active

07852652

ABSTRACT:
A content addressable memory (CAM) device can include a number of match lines, each coupled to a plurality of CAM cells. The CAM device also includes one or more one precharge circuits. Such a precharge circuit can have a first precharge path that couples a match line to a precharge voltage node in response the activation of a first control signal, and a second precharge path that couples the match line to the precharge voltage node in response to the activation of a second control signal. Prior to a compare operation leakage current through the CAM cells can prevented by disabling the precharge paths and isolating the CAM cells from a reference voltage (e.g., ground). The second control signal can be activated after the first control signal in a compare operation.

REFERENCES:
patent: 5970007 (1999-10-01), Shiratake
patent: 6804133 (2004-10-01), Khanna
patent: 6972978 (2005-12-01), Miller et al.
patent: 2002/0196648 (2002-12-01), Gordon et al.
patent: 2004/0114411 (2004-06-01), Noda et al.

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