Exact Path Delay Grading with Fundamental BDD Operations

  • Authors:
  • S. Padmanaban;M. Michael;S. Tragoudas

  • Affiliations:
  • -;-;-

  • Venue:
  • ITC '01 Proceedings of the 2001 IEEE International Test Conference
  • Year:
  • 2001

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Abstract

We formulate the fault grading problemas a combinatiorial problem that amounts to storingand manipulating sets on a special type of Binary DecisionDiagrams (BDDs), called zero-suppressed BDDs(ZBDDs), that represent sets in a unique and compactmanner.A simple modification of the basic schemeallows us to overcome memory problems that mayarise by complex set representation.Experimentalresults on the ISCAS'85 benchmarks show considerableimprovement over all existing techniques for exactPDF grading.The main advantages of the proposedmethodology are the simplicity of the approach, interms of it being expressed by a polynomial numberof increasingly efficient BDD-based operations, itsorganization, and its ability to handle very large test sets.