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Instances with placement status "unplaced"

RVERP

I have a bunch of instances in my layout with placement status "unplaced". They aren't shown in virtuoso, but they appear in my stream out gds, causing a lot of DRC errors.

I can simply remove them with dbRemoveObject, so this is easy to fix. But I don't know how they got there. How do you end up with an unplaced instance?

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  • Alex Soyer
    When generating the soft blocks the instances are set to 'unplaced' in order to make easier the floorplanning at the top level and not having a big content of the soft blocks displayed. Actually when generating the soft blocks content we do a Gen From Source inside the instance and then make them 'unplaced'. When you open the layout of that soft block then you need first make the instances all visible. You can do it manually in Navigator, or when you have the warning just click to make all instances visible, the last solution is to use the Floorplan > Reinitialize commands just on instances.
Reply
  • Alex Soyer
    When generating the soft blocks the instances are set to 'unplaced' in order to make easier the floorplanning at the top level and not having a big content of the soft blocks displayed. Actually when generating the soft blocks content we do a Gen From Source inside the instance and then make them 'unplaced'. When you open the layout of that soft block then you need first make the instances all visible. You can do it manually in Navigator, or when you have the warning just click to make all instances visible, the last solution is to use the Floorplan > Reinitialize commands just on instances.
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