Digital data coincidence determining circuit

摘要

A coincidence determining circuit determines whether first and second digital data each consisting of a plurality of bits coincide with one another. The coincidence determining circuit includes a wiring and a plurality of bit comparison circuits corresponding in number to the bits. Each bit comparison circuit includes first and second transistors connected in series between the wiring and a power supply line and third and fourth transistors connected in series between the wiring and the power supply line. The first and second transistors receive a first logical signal of an associated bit of the first digital data and an inverted signal of a second logical signal of an associated bit of the second digital data. The third and fourth transistors receive an inverted signal of the first logical signal and the second logical signal. The four transistors of each bit comparison circuit suppress an increase in circuit area.