SYNCHRONIZING CIRCUIT FOR NON-SYNCHRONIZING SIGNAL AND SEMICONDUCTOR INTEGRATED CIRCUIT

摘要

PROBLEM TO BE SOLVED: To provide a synchronizing circuit for non-synchronizing signal, capable of synchronizing a nonsynchronizing signal in a short time, while avoiding unstable output state from flip-flops in the synchronizing circuit comprising plural flip-flops. SOLUTION: This synchronizing circuit is provided with a lock inhibit circuit CIV composed of a circuit OPG for forming a one-shot pulse by detecting the change of an asynchronous input signal with the cascade connection of two flip-flops, having clock terminals and signal input terminals and a transmission gate G3 for controlling the supply of a clock signal to a first stage flip-flop FF1, while using the one-shot pulse as an inhibit signal.