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Personalization Approach for Josephson Array Logic Memory Cells

IP.com Disclosure Number: IPCOM000082508D
Original Publication Date: 1974-Dec-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 54K

Publishing Venue

IBM

Related People

Terlep, KD: AUTHOR

Abstract

The figure shows an approach which may be used to personalize read-mostly cells in the OR Array of a Josephson array logic subsystem. Each array contains memory cells which require an X-Y select in order to define the cell state. Shift registers are used to provide the personalization information for both arrays in the typical AND array, OR array subsystem structure.

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Personalization Approach for Josephson Array Logic Memory Cells

The figure shows an approach which may be used to personalize read- mostly cells in the OR Array of a Josephson array logic subsystem. Each array contains memory cells which require an X-Y select in order to define the cell state. Shift registers are used to provide the personalization information for both arrays in the typical AND array, OR array subsystem structure.

Personalization of the OR array is performed using a "dual function" shift register 6 whose contents control the devices provided in a single row extension of the many input, OR-function, sense circuits in the AND array. Each sense circuit controls an intermediate driver for a single "Y" line of the OR array. Thus, personalization for the OR array is accomplished with a single "X" line selected and "Y" information provided through the AND array. This utilizes available sense and drive circuitry. All input data to the AND array must be inhibited.

Personalization of the AND array is accomplished by using the AND array "Y" shift register 11, while inhibiting any input information. Shift register 6 now is used as an "X" select with a single row selected at any given time.

All shift registers are filled with "0's" when the subsystem is utilized for logic and are thus transparent during normal operation. The method should also find use for other technologies, wherein cells may be defined using a single "Y" control line for both personalizatio...