Combinational Logic-Level Veri cation using Boolean Expression Diagrams

Boolean Expression Diagrams (BEDs) is a new data structure for representing and manipulating Boolean functions. BEDs are a generalization of Binary Decision Diagrams (BDDs) that are capable of representing any Boolean circuit in linear space and still maintain many of the desirable properties of BDDs. This paper demonstrates that BEDs are well suited for solving the combinational logic-level veriication problem which is, given two combinational circuits, to determine whether they implement the same Boolean functions. Based on all combinational circuits in the ISCAS 85 and LGSynth 91 benchmarks, we demonstrate that BEDs outperform both standard BDD approaches and the techniques speciically developed to exploit structural similarities for eeciently solving the problem.