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OrCAD PCB 16.6 - inconsistent anti-pads

embeddedTom

I've inherited a PCB design that's got some issues. The latest strangeness I've found is that it looks like only two via's have the correct anti-pad size (pic attached. Red circle shows correct anti-pad via's). All the via's are set to the correct size, but only two came out that way. The rest are oversized by a fixed amount (about 14 mils).

Still new to PCB 16.6, but I think I've searched all possible places that would change the anti-pad sizing, but cannot find the reason.

What did I miss?

Thanks.

Tom

  • oldmouldy
    There will be differing rules applied. From the menu, Check>Constraints, or Display>Constraint for the legacy menus, left-click and drag the to select the Pin / Via and Shape and the resolved Constraint will be displayed. You may have Pin / Via, Net, Net Class overrides applied.
  • embeddedTom
    Thanks. That's a handy feature.

    After using it though, I'm confused by what I've found. The resolved constraint pop-up says that the "incorrect" anti-pads have a 12 mil air gap. But all the DRC settings are set to 15 mils! How can that be?
  • redwire

    There's more detail in the pop-up than you are reading.  There are multiple layers of rules in play here.  Post up a screen shot of the DRC errors or if you want, zip up the board and PM or post here.  It's a constraint in effect that is causing the issue that you're not looking at.  Or, you might need to "Update DRC" if you've turned everything off and the error still exists...

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