Fault_Diagnosis_Overview.ppt - Fault Diagnosis Overview...

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Fault Diagnosis Overview Fault Diagnosis Overview David Lavo UC Santa Cruz January 13, 2005
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©2005 David Lavo Fault Diagnosis Over view 2 Outline Outline Introduction: What is Fault Diagnosis? Components: What’s involved? Algorithm details: How does it work? Diagnosis in practice: How does it really work? Research: Why does (or doesn’t) it work? How should it work?
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©2005 David Lavo Fault Diagnosis Over view 3 What is Fault Diagnosis? What is Fault Diagnosis? A guess as to what’s wrong with a malfunctioning circuit Narrows the search for physical root cause Makes inferences based on observed behavior Usually based on the logical operation of the circuit
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VLSI Fault Diagnosis VLSI Fault Diagnosis (in One Slide) (in One Slide) Tests Observed Behavior Defective Circuit Diagnosis Diagnosis Algorithm Physical Analysis Location or Fault
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©2005 David Lavo Fault Diagnosis Over view 5 Two Types of Diagnosis Two Types of Diagnosis Circuit Partitioning (“Effect-Cause” Diagnosis) Identify fault-free or possibly-faulty portions Identify suspect components, logic blocks, interconnects Model-Based Diagnosis (“Cause-Effect” Diagnosis) Assume one or more specific fault models Compare behavior to fault simulations
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©2005 David Lavo Fault Diagnosis Over view 6 Circuit Partitioning Circuit Partitioning Separate known-good portions of circuit from likely areas of failure Simplest method: identify failing flip-flops
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