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Use inner layer planes in layout version 7.x

Former Member


What happened in version 7 that takes away the ability to force use of a ground plane?  It used to be possible to set the via penalty low, which would via a signal to a plane of the same name, i.e. gnd.  I want the ground plane to connect all gnd pads and vias to the ground plane inner layer, not route gnd around the board.

 

Thanks,

 

Dave

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  • On 25/10/15 05:52, David Smead wrote:

     

    What happened in version 7 that takes away the ability to force use of a

    ground plane?  It used to be possible to set the via penalty low, which

    would via a signal to a plane of the same name, i.e. gnd.  I want the

    ground plane to connect all gnd pads and vias to the ground plane inner

    layer, not route gnd around the board.

     

    Did V7 remove the "power plane" option? I have a vague recollection of

    that but since I never used that "feature" I don't know for sure. Power

    planes were of limited use.

     

    These days, the approach is to start the autorouter for ground only,

    with low via penalty but, more importantly, a very high cost on all

    layers except the one you want to be a ground plane. That should result

    in minimal length top/bottom tracks to a via, and the rest of the ground

    signal routed on your inner layer. After that, reverse the layer costs

    and route other signals.

     

    But I never use the autorouter, so I may be totally wrong.

     

     

  • in reply to autodeskguest

    All that does is route gnd in small traces on the top layer.

    I can't find anything in the router that mentions vias.

    It has to punch vias close to smd pads through to the ground plane layer.

Reply Children
  • in reply to Former Member

    On 10/25/2015 1:16 PM, David Smead wrote:

    All that does is route gnd in small traces on the top layer.

    I can't find anything in the router that mentions vias.

    It has to punch vias close to smd pads through to the ground plane

    layer.

     

    --

    To view any images and attachments in this post, visit:

    http://www.element14.com/community/message/164919

     

     

    Hi David,

     

    I hope you're doing well. The $ layers(inverse plane layers) were

    deprecated with the release of EAGLE V6. All power planes are now

    produced using the Polygon command.

     

    Now for the type of routing you want to create you have to setup the

    autorouter in accordance with the recommendations at the end of Chp 7 in

    the eagle manual.

     

    I've attached two configuration files I use for this purpose.As Rob

    mentioned you start the autorouter so that it only routes the plane

    signal, you can then load one of these configs and see the result.

     

    hth,

    Jorge Garcia

     

     

     

    Attachments:
    ViaDrop2.ctl.zip
    ViaDrop2_tighter.ctl.zip