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Forums > Digital IC > Floorplanning, Place and route

Subject: Bob, 1 question about define RC corner, thanks!
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eminemshow
Posts: 75
Online: User is Offline
4/24/2008 9:15 PM  
Bob,

Recently, I am doing timing check. I want to do both setup and hold check at MIN MAX corners, which means to 2 checks at MAX corner, and 2 checks at MIN corner. Following is what Encounter UG said:

1. setTimingLibrary -max MAX -min MAX
2. setOpCond worst -lib MAX
3. (Optional) setTimingDerate -max, setTimingDerate -min
4. Then Encounter automatically 'setAnalysisMode -single'

Then I found 1 problem, how about the defineRCCorner? Cell delay will use MAX corner to do setup & hold check according to the steps, how about wire delay? So I use 'defineRCCorner -late worst -early worst' to make sure that setup & hold check both use worst RC.
Am I right? Is there anything else that I should pay attention to?
BobD
Posts: 80
Online: User is Offline
4/29/2008 6:30 AM  
Hi eminemshow,

I think you've got it right- you're correctly setting up the tool to perform single corner setup and hold checks with min and max corners as you desire.

One thing I'd mention for your consideration in the future is moving to MMMC mechanisms for configuring the tool, even if you only have a single setup and a single hold view. Why? Because performing the analysis your describe is simpler with MMMC commands- you just say "set_analysis_view -setup {max min} -hold {max min}" and then timeDesign/timeDesign -hold. The tool would take care of the rest because in MMMC mode, extraction and delay calculation information is tied to each analysis view whereas in the scenario you present the onus is more on the user to manage.

Hope this helps,
Bob
eminemshow
Posts: 75
Online: User is Offline
4/29/2008 7:03 PM  
Posted By BobD on 4/29/2008 6:30 AM
Hi eminemshow,

I think you've got it right- you're correctly setting up the tool to perform single corner setup and hold checks with min and max corners as you desire.

One thing I'd mention for your consideration in the future is moving to MMMC mechanisms for configuring the tool, even if you only have a single setup and a single hold view. Why? Because performing the analysis your describe is simpler with MMMC commands- you just say "set_analysis_view -setup {max min} -hold {max min}" and then timeDesign/timeDesign -hold. The tool would take care of the rest because in MMMC mode, extraction and delay calculation information is tied to each analysis view whereas in the scenario you present the onus is more on the user to manage.

Hope this helps,
Bob

Thanks! Bob!
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Forums > Digital IC > Floorplanning, Place and route > Bob, 1 question about define RC corner, thanks!


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