so lower dft coverage, why?

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HolySaint

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tetramax fastscan coverage

Here i use estimate_test_coverage commond to estimate the testcoverage

what a low testcoverage

RPT
================================================

==============================================

who can tell me which part may be wrong?
the design i load is produced by DC

Added after 3 minutes:

when i use preview_dft to list the reg,
i find almost all regs are ready to insert dft

do i understand right?
 

chain test pattern failed contention checking

You should check the dft_drc report. The report will tell u the dft violation information such as D1.D2.D3.... . Then fix them
 

    HolySaint

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test coverage dft

rsqf said:
You should check the dft_drc report. The report will tell u the dft violation information such as D1.D2.D3.... . Then fix them
Click to expand...

thx , i'll have a try.
if more violation is found,fix the timing in dc script can help,is that right?
 

dft+coverage



if the dft script is correct , and autofix does not work , u should change the RTL code to improve the dft coverage.
 

dft_drc in dft

mostly the controllability and observability cause problem.
you could try to report scan chain cell.
what I impressed is that some part of design is not correctly inserted into scan chain.
 

    HolySaint

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dft violation

Warning: 1152726 faults aborted during contention prevention. (M139)

there is no pattern is generated becasue of the contention violation. i dont know how the DC is calculating cvoerage.

can you try in tetramax or fastscan to check the coverage estimation.
in tetramax, issue " run drc " command, this will give you the all the deatils to violations..
 

    HolySaint

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dft atpg script

thx for everyone
i'll try tmax to detect it again
 

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