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[PhysNetlistWriter] Fix stubs on static nets #928

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Merged
merged 5 commits into from
Dec 23, 2023

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@eddieh-xlnx eddieh-xlnx commented Dec 22, 2023

Previously, the following stubs exist:

  • On GND nets, the BELPin SLICE_X?Y?/HARD0GND.0 would always be present for every slice in the design. Omit it as it's almost always unused (has no branches) and even if it was used, adds no value since it's an always-on static source.
  • On static (mostly VCC) nets, PIPs that originate from a static source (e.g. INT_X?Y?/VCC_WIRE) were being recognized as stubs, when they should be sources.

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