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report_timing issue

meds7

Dear all,


I am using multimode analysis views for creation of multi corner timing info in my .sdf file.

After setting the analysis view and trying to report timing with the 'report_timing' command in encounter I see that no delays are used for my clock tree. It is only the clock tree timing info which is missing in the timing reports. All other delays are present.

Does anybody know what I am doing wrong?

regard

Henk

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  • It's been a while since i've dealt with clocks and constraints, but i think there are a few ways you can do it. you can use set_interactive_constraint_modes to the analysis view you want (but ideally all of them), then issue the set_propagated_clock command. Or, you can have two sets of SDC files (constraints): one "ideal", like you already have, and another "propagated" which contain the set_propagated_clock statement(s). Then you use the propagated version of the SDCs after your clock trees are built. However, I thought that when going through the design flow in EDI, once clock trees were in, then clocks would automatically be propagated, but like I said it's been a while since I did this, and I also don't know anything about your flow. Hope that helps!
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  • It's been a while since i've dealt with clocks and constraints, but i think there are a few ways you can do it. you can use set_interactive_constraint_modes to the analysis view you want (but ideally all of them), then issue the set_propagated_clock command. Or, you can have two sets of SDC files (constraints): one "ideal", like you already have, and another "propagated" which contain the set_propagated_clock statement(s). Then you use the propagated version of the SDCs after your clock trees are built. However, I thought that when going through the design flow in EDI, once clock trees were in, then clocks would automatically be propagated, but like I said it's been a while since I did this, and I also don't know anything about your flow. Hope that helps!
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