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why structral testing rather than functional testing in dft?

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newdft

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why in dft we do structural testing rather than functional testing whereas functional testing will give accurate result?
 

akam

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Design for testability is meant for detecting manufacturing defects. It is basically to improve controllability and observability of a design. Functionality of a design can be checked in verification.
 

dftrtl

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Functional testing you can figure out by Functional Failure.
 

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