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Forcing it to use vias

StefanTh

Hi

 

I have a 4 layer board where layer 2 is GND and 15 Vcc, how do I force the router to use vias for GND and Vcc instead of using

top and bottom layer to connect devices ?

 

That is, I want the autorouter to use a via at the device pin instead of connecting

different GND/Vcc pins with each other via the the top and bottom layer

 

I tried tochange the layer cost etc. but it seems that it did not affect it

 

 

 

Regards Stefan

Parents

  • Stefan Olsson wrote on Thu, 25 October 2012 06:22

    I have a 4 layer board where layer 2 is GND and 15 Vcc, how do I force

    the router to use vias for GND and Vcc instead of using top and bottom

    layer to connect devices ?

     

    Route just the GND net with layer costs set high and via cost 0.

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    Web access to CadSoft support forums at www.eaglecentral.ca.  Where the CadSoft EAGLE community meets.

     

  • in reply to e14 Contributor

    If I, on the tab "Route" in the Autorouter Setup, sets Layer cost to 40 for Top, Route2, Route15 and Bottom

    and the Via Costs to 0.

     

    It still use the Top layer copper to connect the GND pin of devices.

     

    Should I change the settings on the "Optiimize1 ... "Optimize4" as well (I copied the values from the Route Tab but it does not seems to affect the result) ?

     

    Also, I quite often get the result "Optimized ..... Polygons may have fallen apart", what does this mean ?

  • in reply to StefanTh

    On 26/10/12 07:51, Stefan Olsson wrote:

    If I, on the tab "Route" in the Autorouter Setup, sets Layer cost to 40 for Top, Route2, Route15 and Bottom

    and the Via Costs to 0.

     

    It still use the Top layer copper to connect the GND pin of devices.

     

    No, what you want is to tell the autorouter to use layer 2 for ground in

    preference to all others, so why would you set its cost high?

     

    Set layers Top, Route15 and Bottom to be cost 99

    Set layer Route2 to be cost 0

    Set via cost to 0

    Route ONLY THE GROUND net

     

    Now change Route2 to cost 99, Route15 to cost 0, and route only the VCC net.

     

    Now set layers Route2 and Route15 to a moderately high cost, layers top

    and bottom to cost 0, and vias to medium cost. Proceed to route the

    remaining nets in an appropriate order.

     

  • in reply to e14 Contributor

    Hi

     

    Nice, now it works pretty well, thanks

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