Programmable sequential logic

TL;DR: In this paper, a mass production sequential logic circuit which can be custom programmed by modification of a single fabrication mask to perform sequential combinational logic is disclosed, which includes a first programmable matrix of voltage controlled devices for generating product terms, a second programmable array of voltage control devices for summing the product terms and a plurality of binary storage elements such as flip-flops or shift registers, input inverters and output buffers on the same semiconductor substrate.

Abstract: A mass production sequential logic circuit which can be custom programmed by modification of a single fabrication mask to perform sequential combinational logic is disclosed. The circuit includes a first programmable matrix of voltage controlled devices for generating product terms, a second programmable matrix of voltage controlled devices for summing the product terms, a plurality of binary storage elements such as flip-flops or shift registers, input inverters and output buffers on the same semiconductor substrate. The outputs of the second matrix are applied either to the inputs of the storage elements, or to the output buffers, or both. The outputs of the storage elements are applied either to inputs of the first matrix, or to output buffers, or both.