Content addressable memory
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United States of America Patent
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-
Jul 23, 1991
Grant Date -
N/A
app pub date -
May 22, 1990
filing date -
May 23, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A content addressable memory (CAM) comprises a plurality of CAM cells, a CAM cell block comprising the CAM cells, a CAM array arranging a plurality of the CAM cell blocks to the row direction, a work line arranging a predetermined direction in each of the CAM cell blocks, a block matching line for outputting a result of a retrieval operation in the CAM cells connected to the same word line in the same CAM block and installed corresponding to the same word line, an array matching line for outputting the result of the retrieval operation output to the block matching line, and transfer circuits for transferring the result of the retrieval operation to the array matching line. Another CAM further comprises masking circuits for masking retrieval data at a predetermined CAM block.
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