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Detected Layer-to-Layer Polygons that overlap

maxwellj

I was wondering if anyone has a routine that goes in and lists all polgyons that overlap each other on a layer to layer basis.  We've been directed to find a way to check all our layers 1-2, 2-3, 3-4, .... and note any voltage polygons that overlap each other and then give them a percentage of overlap for each shape.  It's overkill, but these people have no other work to do, so they make new work for us.  Any help would be appreciated.

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  • You can use a script in OrCAD/Allegro Skill (SKILL) to detect overlapping polygons layer by layer. The general approach is:

    1. Iterate through all layers and extract voltage polygons.
    2. Compare each polygon with others on the same layer using dbGetOverlap or similar functions.
    3. Calculate the percentage of overlap using area formulas.
    4. Output a report listing overlapping polygons and their percentage of overlap.
      Here is the Script

      procedure(checkPolygonOverlap()
      let((layers polys layerPairs overlapResults)

      ;; Get all layers in the design
      layers = axlDBGetStackupLayers()
      layerPairs = nil

      ;; Create layer pairs (1-2, 2-3, etc.)
      for(i 1 (length(layers) - 1)
      layerPairs = cons(list(nth(i layers) nth(i+1 layers)) layerPairs)
      )

      overlapResults = nil

      ;; Loop through each layer pair
      foreach(layerPair layerPairs
      let((layer1 layer2 poly1 poly2 overlapArea poly1Area poly2Area overlapPercentage)
      layer1 = car(layerPair)
      layer2 = cadr(layerPair)

      ;; Get all polygons from both layers
      polys = axlDBGetShapesByLayer(list(layer1 layer2) 'dynamic_shape)

      foreach(poly1 polys
      foreach(poly2 polys
      if(poly1 != poly2 && axlDBOverlap(poly1 poly2)
      overlapArea = axlDBGetOverlap(poly1 poly2)
      poly1Area = axlDBGetArea(poly1)
      poly2Area = axlDBGetArea(poly2)

      overlapPercentage = 100.0 * overlapArea / max(poly1Area poly2Area)

      overlapResults = cons(
      list("Layer:" layer1 "&" layer2 "Overlap:" overlapPercentage "%")
      overlapResults
      )
      )
      )
      )
      )
      )

      ;; Print results
      foreach(result overlapResults
      printf("%s\n" result)
      )
      )
      )

      checkPolygonOverlap()



Reply

  • You can use a script in OrCAD/Allegro Skill (SKILL) to detect overlapping polygons layer by layer. The general approach is:

    1. Iterate through all layers and extract voltage polygons.
    2. Compare each polygon with others on the same layer using dbGetOverlap or similar functions.
    3. Calculate the percentage of overlap using area formulas.
    4. Output a report listing overlapping polygons and their percentage of overlap.
      Here is the Script

      procedure(checkPolygonOverlap()
      let((layers polys layerPairs overlapResults)

      ;; Get all layers in the design
      layers = axlDBGetStackupLayers()
      layerPairs = nil

      ;; Create layer pairs (1-2, 2-3, etc.)
      for(i 1 (length(layers) - 1)
      layerPairs = cons(list(nth(i layers) nth(i+1 layers)) layerPairs)
      )

      overlapResults = nil

      ;; Loop through each layer pair
      foreach(layerPair layerPairs
      let((layer1 layer2 poly1 poly2 overlapArea poly1Area poly2Area overlapPercentage)
      layer1 = car(layerPair)
      layer2 = cadr(layerPair)

      ;; Get all polygons from both layers
      polys = axlDBGetShapesByLayer(list(layer1 layer2) 'dynamic_shape)

      foreach(poly1 polys
      foreach(poly2 polys
      if(poly1 != poly2 && axlDBOverlap(poly1 poly2)
      overlapArea = axlDBGetOverlap(poly1 poly2)
      poly1Area = axlDBGetArea(poly1)
      poly2Area = axlDBGetArea(poly2)

      overlapPercentage = 100.0 * overlapArea / max(poly1Area poly2Area)

      overlapResults = cons(
      list("Layer:" layer1 "&" layer2 "Overlap:" overlapPercentage "%")
      overlapResults
      )
      )
      )
      )
      )
      )

      ;; Print results
      foreach(result overlapResults
      printf("%s\n" result)
      )
      )
      )

      checkPolygonOverlap()



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