Disjunctive partitioning and partial iterative squaring: an effective approach for symbolic traversal of large circuits

  • Authors:
  • Gianpiero Cabodi;Paolo Camurati;Luciano Lavagno;Stefano Quer

  • Affiliations:
  • Politecnico di Torino, Dip. di Automatica e Informatica, Turin, Italy;Università di Udine Dip. di Matematica e Informatica, Udine, Italy;Politecnico di Torino, Dip. di Elettronica, Turin, Italy;Politecnico di Torino, Dip. di Automatica e Informatica, Turin, Italy

  • Venue:
  • DAC '97 Proceedings of the 34th annual Design Automation Conference
  • Year:
  • 1997

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Abstract

Extending the applicability of reachability analysis to large andreal circuits is a key issue.In fact they are still limited forthe following reasons: peak BDD size during image computation,BDD explosion for representing state sets and very highsequential depth.Following the promising trend of partitioning and problem decomposition,we present a new approach based on a disjunctivepartitioned transition relation and on an improved iterativesquaring.In this approach a Finite State Machine is decomposedand traversed one "functioning-mode" at a time bymeans of the "disjunctive" partitioned approach.The overall algorithm aims at lowering the intermediate peakBDD size pushing further reachability analysis.Experimentson a few industrial circuits containing counters and on somelarge benchmarks show the feasibility of the approach.