METHOD AND APPARATUS FOR CONTENT ADDRESSABLE MEMORY WITH A PARTITIONED MATCH LINE
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United States of America Patent
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Nov 5, 2002
Grant Date -
Nov 7, 2002
app pub date -
May 7, 2001
filing date -
May 7, 2001
priority date (Note) -
Granted
status (Latency Note)
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Abstract
The present invention provides a content addressable memory (CAM) circuit that includes at least one row of memory cells storing data to be subjected to search data for a compare operation, with the cells in each row being inter-connected by a match line. Each cell can, if the search data does not match the stored data, discharge the match line in an evaluation operation. According to the present invention, a match line is partitioned into a least two segments, each segment having a first unit for precharging and evaluating the match line segment and a second unit for determining the result of the evaluation operation. The compare operation of the second and any subsequent segments is performed and the corresponding matchline segment involved only if the result of the compare operation of the respective preceding segment indicates a data match.
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