Content addressable memory with flag storage to indicate memory state
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United States of America Patent
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-
Dec 4, 1990
Grant Date -
N/A
app pub date -
Dec 12, 1988
filing date -
Mar 1, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A content addressable memory device capable of correct retrieval operation comprises a flag bit column (12) provided in a memory cell array. The flag bit column (12) stores a flag signal indicating whether a word is in a data written state or an empty state for each word in a data array (2). In the retrieval operation, the data written in the data array (2) and a flag bit column (12) are simultaneously retrieved, providing a correct retrieval result. In addition, since the flag bit column (12) is provided in the memory cell array, it can be controlled in a manner similar to controlling the data array (2).
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