We now turn to the synchronous approach [to real-time systems] … The basic idea is very simple: we consider … time. … In the synchronous model, a system can be … issues. … [p. 1275] 1. Changes of state in each of … signals. 2. The emission of output signals in … state. 3. … [The reception of signals to a module] is synchronous (or simultaneous) with their emission … [from another module] … [of the example system] is entirely fixed whenever the global interleaving of the two …
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