Incremental QBF Preprocessing for Partial Design Verification

(Poster Presentation)
  • Paolo Marin
  • Christian Miller
  • Bernd Becker
Part of the Lecture Notes in Computer Science book series (LNCS, volume 7317)


Bounded Model Checking (BMC) is a major verification method for finding errors in sequential circuits. BMC accomplishes this by iteratively unfolding a circuit k times, adding the negated property, and finally converting the BMC instance into a sequence of satisfiability (SAT) problems. When considering incomplete designs (i.e. those containing so-called blackboxes), we rather need the logic of Quantified Boolean Formulas (QBF) to obtain a more precise modeling of the unknown behavior of the blackbox. Here, we answer the question of unrealizability of a property, where finding a path of length k proves that the property is violated regardless of the implementation of the blackbox. To boost this task, solving blackbox BMC problems incrementally has been shown to be feasible [3], although the restrictions required in the preprocessing phase reduce its effectiveness. In this paper we enhance the verification procedure when using an off-the-shelf QBF solver, through a stronger preprocessing of the QBF formulas applied in an incremental fashion.


Transition Relation Preprocessing Method Partial Design Cumulative Time Sequential Circuit 
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  1. 1.
    Giunchiglia, E., Paolo, M., Narizzano, M.: QuBE7.0, System Description. Journal of Satisfiability 7(8), 83–88 (2010)Google Scholar
  2. 2.
    Kupferschmid, S., Lewis, M., Schubert, T., Becker, B.: Incremental preprocessing methods for use in bmc. Formal Methods in System Design 39, 185–204 (2011)CrossRefGoogle Scholar
  3. 3.
    Marin, P., Miller, C., Lewis, M., Becker, B.: Verification of Partial Designs Using Incremental QBF Solving. In: DATE(2012)Google Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  • Paolo Marin
    • 1
  • Christian Miller
    • 1
  • Bernd Becker
    • 1
  1. 1.University of FreiburgGermany

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