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Forums > Digital IC > Floorplanning, Place and route

Subject: avoid use of certain cells within a subdesign
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mhkataoka
Posts: 1
Online: User is Offline
6/04/2008 10:27 AM  
I've used create_library_domain+set_attribure avoid true... commands in RC to avoid instantiation of certain cells within a subdesign.

Now I'm in Encounter. What is the best way to avoid optimization to replace cells and use those I didn't want?
I've found some options
a)setOptMode -noRestruct
b)set_dont_touch on cells I don't want it to be replaced

(a) is not desirable because it's a global option and  there are modules I'd like to let Encounter to optimize
(b) is ok, but I would like to let Encounter  optmize(resize, restructu) whenever needed but just not using some types of cells.

Do you suggest any other option?
Thanks.
bougantp
Posts: 19
Online: User is Offline
6/04/2008 10:34 AM  
No easy to undel that in Encounter...
One possible workAround is to:
1- Setup your restrictive dontUse list
2- Run a full block optimization
3- set a dontTouch on your specific module
4- relax your dontUse list
5- run incremental optimization

For the step 2, you might have to specify a path_group (Someting available in 71), if your critical path is outside your special module, to force encounter to work for path within it.

Pat.
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Forums > Digital IC > Floorplanning, Place and route > avoid use of certain cells within a subdesign


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