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2 1/2 D Magnetic Memory

IP.com Disclosure Number: IPCOM000093606D
Original Publication Date: 1967-Nov-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

Daughton, JM: AUTHOR

Abstract

In this magnetic memory array, the four horizontal lines are bit-sense lines for the same bit position of four different words in the memory. During a memory cycle, the addressed one of these wires is coupled to a bit driver and a sense amplifier. The other three wires are isolated from the bit driver and sense amplifier. A network of controlled transformers 2 end reactors 3 establishes the selected coupling between the bit-sense wires and the bit driver and sense amplifier.

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2 1/2 D Magnetic Memory

In this magnetic memory array, the four horizontal lines are bit-sense lines for the same bit position of four different words in the memory. During a memory cycle, the addressed one of these wires is coupled to a bit driver and a sense amplifier. The other three wires are isolated from the bit driver and sense amplifier. A network of controlled transformers 2 end reactors 3 establishes the selected coupling between the bit-sense wires and the bit driver and sense amplifier.

During a read operation, a word conductor, not shown, is energized to produce a nondestructive read operation in storage elements of the addressed word and also of the three unaddressed words. The transformer and reactor network short-circuit the unaddressed bit-sense wires. These short-circuit connections oppose magnetization charges in the unaddressed storage elements and thus enhance the nondestructive read operation of this memory.

In the coupling network the transformers have a primary winding and a secondary winding that are inductively coupled by cores which are shown as rectangles. These cores have control windings 4 that selectively switch the core material between a state to inductively couple the transformer windings and a state to isolate the transformer windings.

In reactor 3, the control winding similarly switches the reactor between a high-impedance state and a low-impedance state. In the drawing, windings 4 are identified according to logic variables A...