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  3. Same net shape to via spacing when a via edge touches the...

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Same net shape to via spacing when a via edge touches the shape: how to set the shape to void the via edge?

avant
avant over 3 years ago

If a via touches the edge of a shape on the same net, how to set the shape to void around the via?

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  • JuanCR
    JuanCR over 3 years ago +1
    Hi What exactly do you mean? This is what I understand you want to do: You have a via that touches a shape and they both belong to the same net: As you can see in the picture, there is full contact…
  • avant
    avant over 3 years ago in reply to JuanCR +1
    The edge of a via is touching the edge of a same-net shape. The center of the via is not within the shape. The shape is not voided to remove the small copper sliver. The vias need to have full contact…
  • avant
    avant over 3 years ago in reply to avant +1
    Here's an example.
  • excellon1
    excellon1 over 3 years ago

    Hi.

    Normally if the via is of the same net name as a dynamic shape then by default if the shape touches the via it will connect because it is of the same net name. However
    you could apply a property to the via so that it will not allow a connection to a shape of the same net name. The result will be that the shape will clear the via.

    To do this select a via and right click it and choose properties. Add in the property NO_SHAPE_CONNECT and the shape will completely clear around the via. 

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  • JohnnyHops
    JohnnyHops over 2 years ago in reply to avant

    Hello Avant, Did you ever find a solution to this?

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  • avant
    avant over 2 years ago in reply to JohnnyHops

    No, I did not find a solution. 

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  • moosePCB
    moosePCB over 1 year ago in reply to avant

    Avant, 

    I was having the same issue, and my fix was to remove a 'drawing property' called "PAD_SHAPE_TOUCH_CONNECTION". This forced the copper shape to be at least 1/2 covering the via to make a connection. If not 1/2 over the via, the copper shape would void as expected and not leave a sliver. I only found this issue after generating an ODB which actually suppressed the pad leading to a NO CONNECTION in the manufacturing files. 

    Edit -> properties -> in find filter scroll down to drawing -> delete "PAD_SHAPE_TOUCH_CONNECTION" property. 

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  • avant
    avant over 1 year ago in reply to moosePCB

    Thanks!

    This is exactly what I was looking for.

    Typical for Cadence to enable an unwanted feature by default.

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