Simplified combinational logic circuits and method of designing

Details Simplified combinational logic circuits and method of designing Simplified combinational logic circuits and method of designing

1979-11-15

1982-06-22

Zazworsky, John

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307465, H03K 1900, H03K 1920

Patent

active

043364683

ABSTRACT:
A logic circuit and method for implementing a given, partially symmetric Boolean function f(x.sub.1 -x.sub.n) which is pairwise symmetric with respect to at least one pair x.sub.i x.sub.j of variables such that the function is invariant under their permutation. The circuit includes a symmetric logic array having a transposition gate for each pair x.sub.i x.sub.j, and a combinational logic circuit connected to the output of each transposition gate. The latter filters redundant values of each pair x.sub.i x.sub.j and these values are used in the design of the combinational logic circuit. The invention simplifies or minimizes the gating for performing the function.

REFERENCES:
patent: 3291974 (1966-12-01), Even
patent: 3381117 (1968-04-01), Forslund et al.
patent: 3579119 (1971-05-01), Yau et al.
patent: 3700868 (1972-10-01), Silvertson, Jr.

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