Memory using conventional cells to perform a ram or an associati

Static information storage and retrieval – Associative memories – Ferroelectric cell

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365174, 365179, 365189, 365195, G11C 700, G11C 1500, G11C 1504

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047409177

ABSTRACT:
Memory comprising a matrix of conventional Harper pnp cells and peripheral circuits which allows it to be used either as a random access memory or as an associative memory. In addition to the read/write circuits which are inhibited in search mode, it comprises search mode control circuits 7-1 to 7-m to provide the memory cells with a search argument DI-1 to DI-m and search circuits 11-1 to 11-n connected to the word lines for detecting the match or mismatch conditions. A search restore circuit 15 common to all word lines WL is used to restore the work lines to a quiescent voltage once the search operation is completed. Circuits 7 and 11 are inhibited in read/write mode.

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IBM Technical Disclosure Bulletin, vol. 26, No. 2, Jul. 1983, pp. 658-659, "Harper PNP Cell Layout with Improved PNP Characteristics", by R. Cullet, B. Denis and D. Omet.
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IBM Technical Disclosure Bulletin, vol. 23, No. 7A, Dec., 1980, pp. 2823-2824, "Associative Memory Cell", by B. A. Denis.
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