Static information storage and retrieval – Associative memories – Ferroelectric cell
Patent
1991-06-17
1994-02-08
Pascal, Robert J.
Static information storage and retrieval
Associative memories
Ferroelectric cell
365106, 365215, 365216, 365234, G11C 1500
Patent
active
052854116
ABSTRACT:
A method and apparatus operate an optical memory to perform bit-slice associative memory operations by storing a plurality of keywords to define a keyword database and accessing the database by means of one of the keywords. Preferably, the plurality of keywords are unique and are used to retrieve data which corresponds individually to the keywords. Operation of the memory is by identification of a keyword, the location of which is to be determined within the memory, for example for data retrieval. The identified keyword is then used effectively as a retrieval mask to access the plurality of keywords. The keyword database and its complement are stored in an optical device with the keyword to be retrieved and its complement being stored in recall optical devices. The keyword database or its complement is repetitively swept by shifting output columnar vectors by one bit position until all bit positions have been swept. Only identical keywords stored in the memory will result in light output during the last sweep with the light output identifying the row or rows which contain the keyword to be retrieved. The optical paths can be reduced and/or the use of complements can be eliminated by means of dual-rail coding and polarization techniques.
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Pascal Robert J.
Ratliff R. A.
Wright State University
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