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restricting inner layers

autodeskguest

I have a 4 layer design with power and ground filling both internal layers

with no internal routing just vias.  I want to set up a restriction to

prevent the power plane filling an area.  How do I set up the internal

restriction?

 

 

Parents

  • On 5/26/2010 9:22 AM, Tony wrote:

    I have a 4 layer design with power and ground filling both internal

    layers with no internal routing just vias. I want to set up a

    restriction to prevent the power plane filling an area. How do I set up

    the internal restriction?

     

    Hi Tony,

     

    You might be better off just turning the inner layers into supply

    layers. Since you're not running any traces through those layers then

    you can use this option.

     

    Using the DISPLAY command select your inner layers and using the change

    button you can set them to supply layers. Remeber that these are

    negative layers so if you route any tracks on them they will be removed.

     

    If you don't want the autorouter to touch those layers you can turn them

    off on the autorouter setup the first tab. Where you see the layer

    preferred directions you can set the layer to N/A not available and the

    autorouter won't route to it.

     

    If you just want the vias placed and routed then you can use this little

    trick. First Disable your optimize runs, then set your via cost to zero,

    and finally type 9999 in the field that allows you to limit the number

    of vias per connection.

     

    When you run the autorouter EAGLE will automatically run vias near all

    ground and power pins.

     

    hth,

     

    Jorge Garcia

    Cadsoft Computer

     

Reply

  • On 5/26/2010 9:22 AM, Tony wrote:

    I have a 4 layer design with power and ground filling both internal

    layers with no internal routing just vias. I want to set up a

    restriction to prevent the power plane filling an area. How do I set up

    the internal restriction?

     

    Hi Tony,

     

    You might be better off just turning the inner layers into supply

    layers. Since you're not running any traces through those layers then

    you can use this option.

     

    Using the DISPLAY command select your inner layers and using the change

    button you can set them to supply layers. Remeber that these are

    negative layers so if you route any tracks on them they will be removed.

     

    If you don't want the autorouter to touch those layers you can turn them

    off on the autorouter setup the first tab. Where you see the layer

    preferred directions you can set the layer to N/A not available and the

    autorouter won't route to it.

     

    If you just want the vias placed and routed then you can use this little

    trick. First Disable your optimize runs, then set your via cost to zero,

    and finally type 9999 in the field that allows you to limit the number

    of vias per connection.

     

    When you run the autorouter EAGLE will automatically run vias near all

    ground and power pins.

     

    hth,

     

    Jorge Garcia

    Cadsoft Computer

     

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