Block mask ternary cam
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United States of America Patent
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May 14, 2002
Grant Date -
N/A
app pub date -
Aug 7, 1998
filing date -
Aug 7, 1998
priority date (Note) -
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status (Latency Note)
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Abstract
A method and system for flexible matching of data in a CAM that does not use the overhead of one mask bit for each matched value bit. The entries of the CAM are logically grouped in a set of blocks, each block having a single mask that applies to all entries in the block. Each block includes a predetermined number of CAM entries, such as a block of 16 entries. However, in alternative embodiments, the number of CAM entries for each block could be predetermined to be a different number, or could be dynamically selected with the values that are entered into the CAM.
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