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prime time report_analysis_coverage has noclock

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andy.huang

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hello,

i used prime time to check timing, and used report_analysis_coverage to show untested report.
There are many untested pins with noclock reason like below


constrained pin related_pin clock check_type slack Reason
--------------------------------------------------------------------------------------------------
xxx/CDN(low) min_pulse_width untested noclock



i checked report_min_pulse_width, and all of them are meet.
please suggest me how to solve this issue, thanks
 

xxx/CDN sounds like a clock gating instance. but that is the only hint I get from the info you shared.
 

it's a DFF cell's reset pin, like this

cell_name dout_reg(.Q(),
.CDN(),
.CP(),
.SI(),
.D(),
.SE() );

in me case, CDN is connected to asynchronous hardware reset, and CP comes from create_clock and pass through clock gated latch
 

This is asynchronous pin so it has nothing to be constrained with REG/CP.
I believe you can check its timing by Removal/Recovery checks.
 

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