In this report, we investigate the impact of design changes on formal verification using MDG (Multiway Decision Graphs) tools. In particular, we would like to determine whether the design changes that make verification by interactive theorem proving simpler, also make verification by automated decision diagram approach simpler as well. The design we consider is the Fairisle 4 by 4 switch fabric which is in use for real applications in the Cambridge ATM Fairisle network. A major consideration during the design change decisions should not compromise other design goals such as performance and functionality. The specification and verification obtained in MDG demonstrated the expected positive impact on these design changes.

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