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Circuit For Detecting Overheating in a Core Memory

IP.com Disclosure Number: IPCOM000098802D
Original Publication Date: 1959-Dec-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 2 page(s) / 45K

Publishing Venue

IBM

Related People

Lipschutz, LD: AUTHOR

Abstract

The circuit detects and signals the approach of an overheated condition in a magnetic core memory caused by excessive use of a memory storage location. The circuit includes a separate monitor core 1 coupled to each row and column address line of the memory 2. The monitor cores are fully switched by half select currents in address lines. Those on the row address lines produce outputs in a sense line 3 and those on the column address lines produce outputs on a sense line 4. If any row or column address line is used at an excessive rate, the associated monitor core is overheated and the amplitude of its output is reduced. A reduction in output below a predetermined minimum is signalled by a voltage sensitive signalling device S coupled to the output of the sense amplifier on each sense line 3 and 4.

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Circuit For Detecting Overheating in a Core Memory

The circuit detects and signals the approach of an overheated condition in a magnetic core memory caused by excessive use of a memory storage location. The circuit includes a separate monitor core 1 coupled to each row and column address line of the memory 2. The monitor cores are fully switched by half select currents in address lines. Those on the row address lines produce outputs in a sense line 3 and those on the column address lines produce outputs on a sense line 4. If any row or column address line is used at an excessive rate, the associated monitor core is overheated and the amplitude of its output is reduced. A reduction in output below a predetermined minimum is signalled by a voltage sensitive signalling device S coupled to the output of the sense amplifier on each sense line 3 and 4.

Excessive use of one storage location causes overheating of both a row monitor core and a column monitor core. This condition is indicated by a signal from the AND circuit coupled to the outputs of the signal devices S. If signal devices of a type responsive only to inputs above a predetermined minimum are employed, their outputs are coupled to an OR circuit to indicate approach of overheating.

The monitor cores may be fabricated from material having a lower Curie temperature than the memory cores or they may be of the same material but driven harder to insure that they heat faster.

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