Range code compression method and apparatus for ternary content addressable memory (CAM) devices
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United States of America Patent
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Mar 8, 2011
Grant Date -
N/A
app pub date -
Mar 26, 2010
filing date -
Jul 22, 2004
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A content addressable memory (CAM) device, method, and method of generating entries for range matching are disclosed. A CAM device (800) according to one embodiment can include a pre-encoder (806) that encodes range bit values W into additional bits E. Additional bits E can indicate compression of range rules according to particular bit pairs. A CAM array (802) can include entries that store compressed range code values (RANGE) with corresponding additional bit values (ENC). Alternate embodiments can include pre-encoders that encode portions of range values (K1 to Ki) in a 'one-hot' fashion. Corresponding CAM entries can include encoded value having sections that each represent increasingly finer divisions of a range space.
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