I am getting the low coverage from TetraMax. There is no issue related to uncontrolleble clock and set/reset but the ATPG untestable faults are more, is this the issue?
Also from top-level coverage report , three sub-blocks having very low coverage (around 70%). These blocks are very small block and consists mostly the combinational logic, do I need to insert test point to those blocks? I tried to insert some test-points but it did not improve test coverage.
Could anybody suggest how can I fix the low covearge or what are the reasons for low coverage.
Thanks