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avoid use of certain cells within a subdesign

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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.


Originally posted in cdnusers.org by mhkataoka

  • 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.


    Originally posted in cdnusers.org by bougantp

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