Content addressable memory (CAM) devices that support power saving longest prefix match operations and methods of operating same
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United States of America Patent
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May 23, 2006
Issued Date -
N/A
app pub date -
Aug 26, 2004
filing date -
Mar 15, 2002
priority date (Note) -
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Abstract
Content addressable memory (CAM) devices include at least one CAM array having a plurality of columns of ternary CAM cells therein. A bit/data line driver circuit, which receives search words and write words, is electrically coupled to the CAM array. The bit/data line driver circuit is configured to save power by logically combining incoming search words with a global mask that designates locations of active ones of the plurality of columns having exclusively locally masked CAM cells at valid entries therein. The bit/data line driver circuit includes a global mask generator configured to receive write words to be added to the CAM array during respective write operations.
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