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Forums > Digital IC > Floorplanning, Place and route

Subject: Question About SetOptMode, Bob, are you there?
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eminemshow
Posts: 75
Online: User is Offline
3/21/2008 7:49 AM  

hi bob, I got one question about setOptMode.

Last night, I type getOptMode command, I find the options:

-congOpt
-rebuffer
-incrTrialRoute

They are the hidden options for setOptMode, I want to know what their functions are, what command do they control, since optDesign is just a large tcl wrapper.

Thanks, Bob!
BobD
Posts: 80
Online: User is Offline
3/27/2008 11:07 AM  
Hi eminemshow,

Options like these are typically undocumented because they're in the process of being qualified for future release. getOptMode should not be revealing their presence, so it is unintentional that the tool exposed these internals to you. I can understand why you might be curious about what they do as you of course want to use the latest and greatest capabilities in the tool to meet timing on your designs.

It sounds like you're using tool version 6.2 or earlier perhaps? In the case of congOpt, it became a documented option in the 7.1 release (it enables an attempt to relieve local congestion during optimization). In the case of rebuffer, it became the default without having an explicit switch to enable it, and the incrTrialRoute option is now obsolete- it never applied to the optDesign command itself (it applied to internal optimization commands).

Perhaps you could share what challenges you're facing with timing optimization in general and we could make a recommendation that leveraged documented options to achieve your goals?

Thanks,
Bob
eminemshow
Posts: 75
Online: User is Offline
3/27/2008 7:34 PM  

Many Thanks, Bob. I thinks I should clarify my current situation further.


When I am closing the timing of my design, I found that in a timing path, there are a lot of cells titled '****_FE_RBC_****', they are buffers or inverters, after delve into this I found that these cells must be 'ReBuffer Cell'. As we know optCritPath will do this 'rebuffer' step. And I want to try if I switch this option off, what will happen to my timing.

So I want to know the detail of this parameter.
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Forums > Digital IC > Floorplanning, Place and route > Question About SetOptMode, Bob, are you there?


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