Decoding device with associative memory permitting variable-length keyword comparisons
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United States of America Patent
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May 14, 2002
Grant Date -
N/A
app pub date -
Jul 21, 2000
filing date -
Dec 27, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A tag array retains a plurality of tag data, and performs matching of the tag data with a retrieval keyword. The tag array includes matching circuits provided corresponding to the tag data. Each of the matching circuits has CM and CC cells provided corresponding to a plurality of bits of the corresponding tag data. Each CM cell retains a corresponding bit of the tag data, and performs matching of the retaining bit with a corresponding bit of the retrieval keyword. Each CC cell, not only functions as the CM cell, but also retains a comparison condition signal input in advance, and invalidates, according to the comparison condition signal, the mismatch detected between corresponding bits of the tag data and the retrieval keyword. As a result, it becomes possible to variably set the number of bits, of an input retrieval keyword, being matched with the tag data.
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