Content-addressable memory system capable of fully parallel magn

Details Content-addressable memory system capable of fully parallel magn Content-addressable memory system capable of fully parallel magn

1988-08-12

1991-02-26

Fears, Terrell W.

Static information storage and retrieval

Associative memories

Ferroelectric cell

36518901, 36523001, G11C 1300, G11C 1500

Patent

active

049966669

ABSTRACT:
A content-addressable memory for storing a plurality of words, each word comprising a plurality of data subfields, and each data subfield comprising a plurality of data bits. Query operations simultaneously compare input data to all subfields in all words and selectably test each subfield for either equality, less-than, less-than-or-equal-to, greater-than, greater-than-or-equal-to, inequality, or don't care. A flag memory comprising a plurality of flag bits for each word stores the results of a selectable Boolean operation performed on a set of flag bits and the query results. A mask register causes selected bit positions within words to be treated as not being present. A priority resolver finds the highest priority flag bit in a particular logic state for selecting a word for reading or writing. A content-addressable memory system composed of a plurality of content-addressable memories and an external priority resolver for selecting between content-addressable memories for reading or writing.

REFERENCES:
patent: 4532606 (1985-07-01), Phelps
patent: 4559618 (1985-12-01), Houseman et al.
patent: 4622653 (1986-11-01), McElroy
patent: 4670858 (1987-06-01), Almy
patent: 4758982 (1988-07-01), Price
patent: 4794559 (1988-12-01), Greenberger

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