It is not easy to point out Hazards and Deadlock in a circuit with a complex structure. Determination methods for Hazard, Race, Deadlock in [1-3] cannot be applied to this case. With complex circuit structure, specific solution must be offered for each circuit type such as solution of synchonization for asynchronous circuits [4]. GALS circuit is a complex circuit system; thus, the above-mentioned solution is also applied to this circuit. 1. Introduction GALS (Global Asynchronous - Local Synchronous) is a combined system. In order to create GALS, the system is divided into many moduls which are independent in respect.
