Pre-computation based ternary content addressable memory
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United States of America Patent
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Jun 30, 2015
Grant Date -
Mar 27, 2014
app pub date -
Sep 27, 2012
filing date -
Sep 27, 2012
priority date (Note) -
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Abstract
A pre-computation based TCAM configured to reduce the number of match lines being pre-charged during a search operation to save power is disclosed. The pre-computation based TCAM stores additional information in a secondary TCAM that can be used to determine which match lines in a primary TCAM storing data words to be searched need not be pre-charged because they are associated with data words guaranteed to not match. The additional information stored in secondary TCAM can include a pre-computation word that represents a range inclusive of a lower and upper bound of a number of ones or zeroes possible in a corresponding data word stored in the primary TCAM.
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