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# Multipath Logic Circuits

IP.com Disclosure Number: IPCOM000097563D
Original Publication Date: 1961-Feb-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 33K

IBM

## Related People

Mathers, H: AUTHOR

## Abstract

The basic core configuration consists of three holes. Additional holes are incorporated to enable application of the core to OR or NOR logic functions. A D. C. bias or a pulse at input time is applied to winding N4 to drive leg 4 into the set state when an input is present. The magnitude of the bias is such that it exceeds the threshold for path A but is below that for path B. The pulse or D. C. bias alone does not change the flux when the core is in the reset state. A reset pulse is normally applied to winding N5.

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Multipath Logic Circuits

The basic core configuration consists of three holes. Additional holes are incorporated to enable application of the core to OR or NOR logic functions. A D.
C. bias or a pulse at input time is applied to winding N4 to drive leg 4 into the set state when an input is present. The magnitude of the bias is such that it exceeds the threshold for path A but is below that for path B. The pulse or D. C. bias alone does not change the flux when the core is in the reset state. A reset pulse is normally applied to winding N5.

Assuming the core is reset, an input to N1 charges C1 and maintains leg 1 in the reset direction. The discharge of C1 results in the flux pattern of the middle drawing when the core is biased by N4. Ringing or other inputs on the input circuit do not affect the output circuit. For the OR logic function, a drive pulse applied to winding N4 causes flux reversal in legs 3 and 4. The flux reverses back to normal when the pulse is removed and when D. C. bias is applied, thus providing non-destructive readout.

For the NOR logic function, a drive pulse applied to winding N4 in such a direction as to drive leg 4 in the clockwise direction results in no change in flux direction and hence no output. In the absence of any input, the drive kidneys the core (right drawing) and provides an output.

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