3 Replies Latest reply on May 14, 2015 7:01 AM by jduquette

    DFF errror


      I have a plane that when I run verification on gives me errors on the 90 degree corners of every rectangular cutout  on it.

      The error is:

      "DFF Error:Sliver on Power Inner Layer 3"


      I have attached a screen capture of the plane with the errors.

      I suspect it has something to do with line width of the hatch but I played with the line width under the planes (selected the

      planes shape and went to properties) properties and it did not seem to help.


      Any ideas how to clear or fix these errors?

      Thank you

        • 1. Re: DFF errror

          That seems odd - why would rectangles cause slivers? 




          Flags copper sliver and solder mask sliver areas. This compares the top solder mask layer against the top electrical layer and the bottom solder mask layer against the bottom electrical layer as defined in the CAM documents.

          • Minimum Copper—Specifies the minimum value for copper slivers. This flags slivers with less area than this value.
          • Minimum Mask—Specifies the minimum value for solder mask slivers. This flags the slivers with a width less than this value, checking the top and bottom solder mask layers if they are visible.


          You might try changing your sliver threshold under the <Setup> button for Fabrication.

          • 2. Re: DFF errror

            I tried reducing the size of the flags in the setup and it only reduced the number of errors a very little bit.

            I think there is a setting that rounds the corners of those cutouts but I do not know what or where it is.

            • 3. Re: DFF errror

              If you go to outline mode ("O") you can see exactly how PADS is drawing the cutout.  For a rectangular cutout it will be a 90 degree corner so there should not be a sliver.  Issueing "O" again will get you back out of outline mode. 


              You might try adding small  (10 mil) miters on the corners of the keepout to see if that changes anything.  If you want to get fancy you can then change the miters to arcs and see if that improves things.  I had to manually convert the miter to an arc with radius, start angle, and end angle; the auto arc function failed so it is tedious.  Cut and paste is handy after you get one converted.


              Or is this just a bug in the DFF?