Before revision: Functional collapsing Two faults are functionally equivalent if they produce identical faulty functions"Using Hierarchy in Design Automation:The Fault Collapsing Problem ",[11th VLSI Design and Test Symposium Kolkata, August 8–11, 2007] or we can say, two faults are functionally equivalent if we can not distinguish them at primary outputs (PO) with any input test vector.Andreas Veneris, Robert Chang, Magdy S. Abadir, Sep Seyedi, "Functional Fault Equivalence and Diagnostic Test Generation in Combinational Logic Circuits Using Conventional ATPG" Fault models in Aerospace contexts A fault model in an Aerospace context is a set of structured information which helps users or systems to identify and isolate a problem that occurs on an engine, Line-replaceable unit (LRU), or Auxiliary power unit (APU) during a flight.
After revision: Functional collapsing Two faults are functionally equivalent if they produce identical faulty functions"Using Hierarchy in Design Automation:The Fault Collapsing Problem ",[11th VLSI Design and Test Symposium Kolkata, August 8–11, 2007] or we can say, two faults are functionally equivalent if we can not distinguish them at primary outputs (PO) with any input test vector.Andreas Veneris, Robert Chang, Magdy S. Abadir, Sep Seyedi, "Functional Fault Equivalence and Diagnostic Test Generation in Combinational Logic Circuits Using Conventional ATPG" In aerospace contexts A fault model in an aerospace context is a set of structured information which helps users or systems to identify and isolate a problem that occurs on an engine, line-replaceable unit (LRU), or auxiliary power unit (APU) during a flight.