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Nor Circuit

IP.com Disclosure Number: IPCOM000098400D
Original Publication Date: 1960-Sep-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 47K

Publishing Venue

IBM

Related People

Budjnoski, FJ: AUTHOR

Abstract

In this multi-apertured magnetic core, the coils are placed such that the output circuit is relatively independent of the input circuit. When two or more input windings are used, the core becomes a NOR gate. A pulse on any one of the inputs results in no output at read time.

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Nor Circuit

In this multi-apertured magnetic core, the coils are placed such that the output circuit is relatively independent of the input circuit. When two or more input windings are used, the core becomes a NOR gate. A pulse on any one of the inputs results in no output at read time.

Starting with the core in the reset condition (flux condition d), a 1 pulse on the input winding kidneys the core. The resulting flux pattern is as shown in (a). The next succeeding pulse on the set and input reset windings (in series) reverses the flux around the input and output holes (b).

The next pulse, applied to the drive winding (read out), tries to change the direction of flux in leg 4. Since the remanent flux in leg 4 is already aligned in the direction in which the drive pulse is trying to switch it, there is no change in flux and hence no output (c). Should there be no input, the core does not kidney (e), and there is no change in flux at set time (f). In this condition, the drive pulse reverses the flux around the output hole (g), with a resulting pulse on the output winding. A pulse on the reset line resets the core (d and h).

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