On-line pruning of ZBDD for path delay fault coverage calculation

Fatih Kocan, Mehmet H. Gunes, Atakan Kurt

    Research output: Contribution to journalArticlepeer-review

    1 Scopus citations

    Abstract

    Zero-suppressed BDDs (ZBDDs) have been used in the nonenumerative path delay fault (PDF) grading of VLSI circuits. One basic and one cut-based grading algorithm are proposed to grade circuits with polynomial and exponential number of PDFs, respectively. In this article, we present a new ZBDD-based basic PDF grading algorithm to enable grading of some circuits with exponential number of PDFs without using the cut-based algorithm. The algorithm overcomes the memory overflow problems by dynamically pruning the ZBDD at run-time. This new algorithm may give exact or pessimistic coverage depending on the statuses of the pruned nodes. Furthermore, we re-assess the performance of the static variable ordering heuristics in ZBDDs for PDF coverage calculation [1]. The proposed algorithm combined with the efficient static variable ordering heuristics can avoid ZBDD size explosion in many circuits. Experimental results for ISCAS85 benchmarks show that the proposed algorithm efficiently grades circuits.

    Original languageEnglish
    Pages (from-to)1381-1388
    Number of pages8
    JournalIEICE Transactions on Information and Systems
    VolumeE88-D
    Issue number7
    DOIs
    StatePublished - Jul 2005

    Keywords

    • On-line pruning
    • Path delay fault
    • Simulation
    • ZBDD

    Fingerprint

    Dive into the research topics of 'On-line pruning of ZBDD for path delay fault coverage calculation'. Together they form a unique fingerprint.

    Cite this