A specific class of Petri nets was extended with Asynchronous-Channels (ACs) and Time-Domains (TDs) to support Globally-Asynchronous Locally-Synchronous (GALS) systems’ modeling, analysis and implementation. This non-autonomous class of Petri nets is targeted to support the development of automation and embedded systems using a model-based development approach. It benefits from a tool chain framework previously developed, covering the whole development flow, from specification to hardware and software deployment. With the extended Petri net class is possible to model GALS systems, and use the specification to generate the corresponding state space supporting the behavior verification and providing valuable information for implementation.