Prototyping is an essential step in the development process of a new design. The ability to execute a design specification written in a formal notation has the advantages of eliminating errors introduced during the translation of the design into a prototype implementation, and of providing immediate feedback on the design.In this paper an example from digital circuit design shows how a requirements specification can be captured in a logic program and how an executable design specification can be derived from it, using a set of equivalence-preserving transformation rules. The resulting specification that is guaranteed to be correct can be used as a prototype implementation or be translated further into a registertransfer level design.
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