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Browse Prior Art Database

Multipath Memory Device

IP.com Disclosure Number: IPCOM000097640D
Original Publication Date: 1961-Mar-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Russell, LA: AUTHOR

Abstract

The memory element employs flux steering to store binary information. The two diagrams at the left indicate the flux directions in the legs for a stored 0 and a stored 1, respectively. The D. C. bias in winding B holds leg 1 saturated upwardly and leg 2 saturated downwardly under normal conditions. Legs 3 and 4 are saturated upwardly and downwardly, respectively, for a stored 0 and in an opposite condition for a stored 1.

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Multipath Memory Device

The memory element employs flux steering to store binary information. The two diagrams at the left indicate the flux directions in the legs for a stored 0 and a stored 1, respectively. The D. C. bias in winding B holds leg 1 saturated upwardly and leg 2 saturated downwardly under normal conditions. Legs 3 and 4 are saturated upwardly and downwardly, respectively, for a stored 0 and in an opposite condition for a stored 1.

At read time, current flows in winding R in the direction indicated by the arrow Ir (upper drawing). The magnitude of this current is sufficient to overcome the effect of the bias in leg 2, switching that leg upwardly, and switching either leg 3 (previously stored 0) or leg 4 (previously stored 1) downwardly. If leg 4 is switched, a significant output voltage is induced in the sense winding S.

Removal of read current permits the bias to return leg 2 to its normal downward saturation, and to switch one of legs 3 or 4 upwardly. If a 1 is to be written, current is applied to winding D in the direction of arrow Id (1) to encourage leg 4 to switch. If a 0 is to be written, current is applied to D in the opposite direction to encourage leg 3 to switch. The digit current thus effectively steers the flux reversal created by the bias through leg 3 or 4. The magnitude of this digit current is very small since it merely selects a path for the flux change created by the bias current.

The device is adapted for either two dimensional (...