Intent:
The Precedence Property Pattern is used to specify portions of a design model's execution for relationships between a pair of states or events,1 where the occurrence of the first is a necessary pre-condition for an occurrence of the second. We say that an occurrence of the second is enabled by an occurrence of the first.
Motivation:
In the normal execution of an RTL state-based model, there is often a cause and effect relative order in which multiple states or events occur during system execution. Precedence properties, which specify that a specific effect must have been preceded by a specific cause, occur quite commonly in specifications of concurrent systems. Perhaps the most common example involves describing a requirement where a grant must have been preceded by a request.
Applicability:
The Precedence Property Pattern can be useful for specifyingcontrol signal handshakes, portions of a protocols, and state transitions.
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