Design and application of a modified universal logic module
Walter Banks, Jayanti C. Majithia · Proceedings of the IEEE · 1973
The basic concept of an n-variable universal logic module (ULM-n) as developed by Yau and Tang is extended so that the input control functions are simple two-bit binary codes and not determined by one of the n variables. Although the resulting design is not a minimum pin configuration, it has the advantage that the control variables are 0 and 1. Basic ULM-2 and ULM-3 are developed and a method of using them to implement higher variable ULM's is also considered.