Modeling and simulation of heterogeneous real-time systems based on a deterministic discrete event model

An approach to system-level modeling and simulation of a class of heterogeneous real-time systems the timing behaviour of which can be modeled by deterministic discrete event systems is described. Examples of systems we consider are self-timed systems, synchronously clocked systems, and mixed asynchronous/synchronous systems. Our model is based on several extensions to the model of timed marked graphs. Basically, we augment this model by adding new schedule constraints such that we can express simultaneity, synchronicity, finite buffering as well as arbitrary combinations of min- and max-constraints. We prove that these extensions allow efficient timing analysis and we show how to simulate realistic systems using the Ptolemy design system.