TRANSFORMATIONS AND SEMANTICAL CHECKS FOR SIL - 1 Corrie Huijs

SIL (SPRITE Input Language) is developed as an intermediate format between a variety of specification languages and a number of input formats of synthesis tools and silicon compilers. The second aim in its development was to get a useful language backbone for transformational design, Therefore, SIL is based on a formal semantical model and on only a small number of basic concepts. Transformational design means using a series of simple transformations to obtain an implementation out of a specification. It is an important design approach because it improves the correctness of designs. It is a way to combine "correctness by construction" with interactive design. This design approach has to be based on a library consisting of transformations which are proven to be correct and behaviour preserving. In this report a number of useful transformations for SIL-1 is defined. The definitions of these transformations are based on a formal representation of SIL-1, which is also discussed in this report. Besides the discussion of transformations, semantical checks, needed to verify the correctness of the SIL-1 descriptions, are presented. 2 Transformations and Semantical Checks for SIL-1