Methods and apparatus for mapping ranges of values into unique values of particular use for range matching operations using an associative memory
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United States of America Patent
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Apr 6, 2004
Grant Date -
N/A
app pub date -
Oct 31, 2002
filing date -
Oct 31, 2002
priority date (Note) -
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Abstract
Methods and apparatus are disclosed for maintaining one or more ranges and identifying whether a value matches one of the ranges and optionally which range is matched. One implementation includes a range programming engine for generating one or more mapped subtrie values identifying each range, each of the mapped subtrie values identifying a different subset of the range. An associative memory stores the mapped subtrie ranges. A mapping engine receives a particular value and generates a lookup word including a mapped representation of the particular value. The associative memory performs a lookup operation to identify whether or not the particular value is within one of the ranges. In this manner, only a small number of associative memory entries are required to identify whether a mapped particular value falls within the range. The particular range matched can be identified such as by a read operation in an adjunct memory based on the address of the matching entry.
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