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Cryotron Associative Memory Cell

IP.com Disclosure Number: IPCOM000094695D
Original Publication Date: 1965-Apr-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 23K

Publishing Venue

IBM

Related People

Lindquist, AB: AUTHOR

Abstract

This cryotron memory cell requires only a single pair of input-output lines per bit position, when utilized in an associative memory. By employing only one pair of access lies for each cell, the critical temperature considerations and interconnection problems normally occurring in connecting individual pairs of write drive, interrogate drive ad sense lines into the usual cryotron cell are alleviated.

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Cryotron Associative Memory Cell

This cryotron memory cell requires only a single pair of input-output lines per bit position, when utilized in an associative memory. By employing only one pair of access lies for each cell, the critical temperature considerations and interconnection problems normally occurring in connecting individual pairs of write drive, interrogate drive ad sense lines into the usual cryotron cell are alleviated.

The cell employs five cryotrons which are interconnected with a single bit drive line having input and output connections. Three pairs of lines are also coupled to the cell for controlling the read, write and comparison operations in an associative memory. The cell operates in the usual manner by storing information as a persistent circulating current in one direction representing a binary 1 and by a persistent circulating current in the opposite direction representing a binary 0.

To write in the cell or to interrogate the cell, the write or compare line, respectively, is energized to permit current flow through the cell. At the same time, the bit drive line is energized in steps with either a positive or negative current. This is dependent on whether the write operation or interrogate operation is for a 1 or 0. The read operation is performed by energizing the read lie and the bit drive line with positive current signals.

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