High Level Reduction Technique for Multiway Decision Graphs Based Model Checking

Multiway Decision Graphs (MDGs) represent and manipulate a subset of first-order logic formulae suitable for model checking of large data path circuits. Due to the presence of abstract variables, existing reduction algorithms that is defined on symbolic model checking with BDD cannot be used with MDG. In this paper we propose a technique to construct a reduced MDG model for circuits described at algorithmic level in VHDL. The simplified model can be obtained using a high level symbolic simulator called TheoSim, and by running an appropriate symbolic simulation patterns. Then, the actual proof of a temporal MDG formula will be generated. We support our reduction technique by experimental results executed on benchmark properties.