Ordering binary decision diagrams used in the formal equivalence verification of digital designs

摘要

A method for ordering input variables in binary decision diagrams is described. Once a plurality of disjoint sets of input variables can be found from the sub-equations of a Boolean function, an initial top-level order can be used to form a significantly smaller diagram. The diagram can by reduced further by application of the method recursively on the sub-equations and successive sub-equations until primary inputs are reached.