Abstract: A logic integrated circuit device includes a pair of input terminals, an OR gate having a pair of inputs coupled to the pair of input terminals, an exclusive OR gate having a pair of inputs coupled to the pair of input terminals, a first output terminal connected from one of the pair of input terminals through a first gate switch and also from the output of the OR gate through a second gate switch, and a second output terminal connected from the other of the pair of input terminals through a third gate switch and also from the output of the exclusive OR gate through a fourth gate switch. Also provided is a data read out circuit which is operatively coupled to the four gate switches through a switch control circuit.

Abstract: A programmable logic device of a single semiconductor chip includes a plurality of programmable AND-OR logic blocks, each block including an AND gate array and an OR gate array and at least a pair of input and output lines; a plurality of input/output buffer blocks, each block including at least one input and output lines; and a plurality of interconnection lines across which the input and output lines extend. A programmable switch is provided at each of the intersections between the input and output lines and the interconnection lines, so that each of the input and output lines are selectively connected to a desired one of the interconnection lines. Preferably, each of the interconnection lines further includes at least one programmable switch so that each of the interconnection lines may be divided into a desired number of segments which are electrically isolated from one another.