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BIST Test length



I have a very basic question about the test length for MUT in logic
BIST. Usually we have a minimum number of test vectors which we
calculate by the fault simulation for the given block. We get a
signature once we apply the minimum number of test vectors on the
module which is compared with the golden signature whether module is
fine. But if we apply more test vectors than the minimum required than
what happens to the signature for the module ? Does it matter or it
does not matter as long as we apply equal to or more than the mim.
number of test vectors for the MUT ?
Thanks in advance
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