비동기식 회로는 전역 클록이 없이 모듈끼리의 핸드셰이크 프로토콜에 의해 데이터를 동기화하고, 전송하는 회로로 전역 클록에 기반한 동기식 회로에 비해 전역 클록으로 인한 문제점들, 예를 들면, 타이밍 종결 문제, 전력 소모 문제, 다중 클록 도메인 설계 문제 등에서 이점을 갖는다. 최근에는 이 두 가지 회로의 장점을 모아 서로 다른 클록에 기반한 비교적 작은 규모의 동기식 모듈을 기반으로 모듈끼리의 데이터 전송을 비동기식으로 수행하는 GALS 구조도 많이 연구되고 있다. 본 고에서는 이러한 비동기식 회로를 위한 설계 방식을 설명하기 위해 먼저, 비동기식 회로의 특성과 설계 동향, 설계 방식에 영향을 미치는 핸드셰이크 프로토콜 및 지연 모델을 소개한다. 그리고, 크게 세가지의 설계 방식을 간단한 예제를 통해 설명한다.
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