Journal article
Equivalence Checking of Combinational Circuits using Boolean Expression Diagrams
The combinational logic-level equivalence problem is to determine whether two given combinational circuits implement the same Boolean function. This problem arises in a number of CAD applications, for example when checking the correctness of incremental design changes (performed either manually or by a design automation tool).This paper introduces a data structure called Boolean Expression Diagrams (BEDs) and two algorithms for transforming a BED into a Reduced Ordered Binary Decision Diagram (OBDD).
BEDs are capable of representing any Boolean circuit in linear space and can exploit structural similarities between the two circuits that are compared. These properties make BEDs suitable for verifying the equivalence of combinational circuits. BEDs can be seen as an intermediate representation between circuits (which are compact) and OBDDs (which are canonical).Based on a large number of combinational circuits, we demonstrate that BEDs either outperform or achieve results comparable to both standard OBDD approaches and the techniques specifically developed to exploit structural similarities for efficiently solving the equivalence problem.Due to the simplicity and generality of BEDs, it is to be expected that combining them with other approaches to equivalence checking will be both straightforward and beneficial
Language: | English |
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Publisher: | IEEE |
Year: | 1999 |
Pages: | 903,904,905,906,907,908,909,910,911,912,913,914,915,916,917 |
ISSN: | 02780070 and 19374151 |
Types: | Journal article |
DOI: | 10.1109/43.771175 |
Application software BED Boolean expression diagrams Boolean functions CAD applications Circuit synthesis Combinational circuits Councils Data structures Design automation Design engineering Information technology Standards development binary decision diagrams circuit CAD combinational circuits data structure data structures design automation tool equivalence checking incremental design changes linear space logic CAD reduced ordered binary decision diagram structural similarities