Multiple-valued Galois field S/D trees for GFSOP minimization and their complexity

The idea of S/D trees for binary logic is a general concept that found its main application in ESOP minimization and the generation of new diagrams and canonical forms. S/D trees demonstrated their power by generating forms that include a minimum Galois-Field-Sum-of-Products (GFSOP) circuits for binary and ternary radices. Galois field of quaternary radix has some interesting properties. An extension of the S/D trees to GF(4) is presented here. A general formula to calculate the number of inclusive forms (IFs) per variable order for an arbitrary Galois field radix and arbitrary number of variables is derived. A new fast method to count the number of IFs for an arbitrary Galois field radix and functions of two variables is introduced; the IF/sub n,2/ Triangles. This research is useful to create an efficient GFSOP minimizer for reversible logic.