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VIAS in Protel 2004

Discussion in 'CAD' started by Andi, Dec 14, 2004.

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  1. Andi

    Andi Guest

    How tell the Autorouter does not place vias under a component,but route a
    track (top and bottom layer) is permitted.
  2. David

    David Guest

    A way to do this might be to create a new plane and add copper (tracks,
    fills, polygons or whatever) to the areas where you don't want vias, and
    lock the tracks. The autorouter will be able to route past the copper on
    other planes, but it can't add a via without causing a short-circuit.
    Once the routing is finished, simply remove the extra plane.
  3. Andi

    Andi Guest

  4. Geo

    Geo Guest

    Just wondering... why would you want to do this?

  5. Boris Mohar

    Boris Mohar Guest

    I was once chewed out by a junior eng for placing vias under components.
    His reasoning was that he "wanted to use them as test points and to insure
    the continuity of the circuit thorough the board" I replied that I would
    oblige as soon as he took the revised cost estimate and his reasoning to his
    boss. Vias stayed.


    Boris Mohar

    Got Knock? - see:
    Viatrack Printed Circuit Designs
  6. Leon Heller

    Leon Heller Guest

    It can be useful with prototypes if you think you might have to cut tracks
    and do some rewiring.

  7. It's a standard feature in Orcad- you just create a via keepout

    Best regards,
    Spehro Pefhany
  8. Not nesessarily the bars should be in the copper (plane or routing) layers.
    You may specify keepouts in any non-routing areas, say, Mechanicalxx. Then
    just add a new clearance rule like a clearance between objects Via and
    (IsKeepout And OnMechanical). You will be able to keep these bars in your
    component footprints, and control via placement by turning on and off your
    clearance rules.
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