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Method and system for subnet defect diagnostics through fault compositing

  • US 8,402,421 B2
  • Filed: 10/12/2010
  • Issued: 03/19/2013
  • Est. Priority Date: 10/12/2010
  • Status: Active Grant
First Claim
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1. A computer-implemented method of diagnosing subnet defects, comprising:

  • (i) receiving, at a computer, callout data comprising a list of faults, each fault of the list of faults comprising failure data and conflict count, the failure data containing miscomparing measures that each fault models, and a conflict indicating that each fault predicts a failure that was not measured;

    (ii) selecting a first fault on a fan-out sink of a fan-out net, the first fault explaining a first failure of the plurality of failures;

    (iii) selecting a second fault on a different sink of the fan-out net, the second fault explaining a second failure that the first fault does not explain;

    (iv) compositing the first fault and the second fault to yield a composite fault, wherein the composite fault comprises a combination of the failure data and conflict count of the first fault and the failure data and conflict count of the second fault;

    (v) generating a composite conflict count by combining the conflict count of the first fault and the conflict count of the second fault;

    (vi) assigning a score to the composite fault based on the composite conflict count; and

    (vii) determining a best candidate composite fault explaining the first fault and the second fault based on the score.

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