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Fault model
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===Functional collapsing=== Two faults are functionally equivalent if they produce identical faulty functions<ref>[http://www.eng.auburn.edu/~vagrawal/TALKS/VDAT07_Rev7.ppt "Using Hierarchy in Design Automation:The Fault Collapsing Problem "],[''11th VLSI Design and Test Symposium Kolkata, August 8β11, 2007'']</ref> or we can say, two faults are functionally equivalent if we can not distinguish them at primary outputs (PO) with any input test vector.<ref>Andreas Veneris, Robert Chang, Magdy S. Abadir, Sep Seyedi, [http://www.eecg.utoronto.ca/~veneris/jetta4.pdf "Functional Fault Equivalence and Diagnostic Test Generation in Combinational Logic Circuits Using Conventional ATPG"]</ref>
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