Browse Prior Art Database

Associative Storage Cell

IP.com Disclosure Number: IPCOM000076308D
Original Publication Date: 1972-Feb-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Berger, HH: AUTHOR [+3]

Abstract

The figure shows the arrangement of cells in the form of an associative storage matrix. In comparison with a read/write matrix, the search operation is new) In this operation, the various words of the matrix are interrogated to determine whether they correspond to a particular bit sequence on the bit lines.

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Associative Storage Cell

The figure shows the arrangement of cells in the form of an associative storage matrix. In comparison with a read/write matrix, the search operation is new) In this operation, the various words of the matrix are interrogated to determine whether they correspond to a particular bit sequence on the bit lines.

In a search operation the bit line concerned is changed to a potential which is slightly less than the word line stand-by potential. A search for a "1", for example, causes the bit line potential of BO to be lowered. Subsequently, bit line transistor T6 is subjected to a current I(SENSE) for a stored "0" (assuming T1 is conductive for a stored 0). This corresponds to a mismatch of the cell information and the stored information. A stored 1 (T2 conductive) results in the current in bit line transistor T6 being inhibited, which corresponds to a match of the stored and the searched information. Only when all the cells of a word match, is there no current in addition to the base current of the PNP transistors in the word sense line. However, the current in this line changes if one or several cells are mismatched.

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