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Changing Layer Stackup

ace5582

Is there a way to change the layer stackup without deleting all of my components? I originally made my design with the following layers:

 signal

pwr

gnd

signal

 

and I want to change it to:

signal

gnd

pwr

signal

 

I tried to change it by going to setup>Cross-section and renaming the layers. I also tried to delete them and remake them. When I tried to delete them I got the following error message: "Database error detected while trying to delete layer".

 

The only way I am able to change or delete the layers is if I delete all components and shapes on those layers. So I would have to delete all of my components and pours. Is there an easier way?

 

Thanks in advance.

  • You're on the right track...for some reason Allegro is wrapped around the axle with the database error you're seeing.


    Back up one step and run "Tools- Database Check" to check/clear any existing layers.

    In the layer stack manager you probably just need to play a game like the following:  name the layers as follows

    PWR to GNDxx

    then

    GND to PWR

    then

    GNDxx to GND

    since you can't have the same name on two layers at once.  The layer name has NOTHING to do with voltages assigned so Allegro does not care what is connected.  You do NOT have to delete anything.

    Does that help?

     

    If you do have voltages attached to the planes then be sure to re-assign the voltages once you've renamed the layers.

  •  It worked. Thanks redwire! I knew there had to be an easy fix :)

  • Hi All,

    Is'nt there anyway two swap two layers in the cross section like I have the layer stackup below

    1-TOP

    2-GND1

    3-PWR1

    4-INR1

    5-INR2

    6-PWR2

    7-GND2

    8-BOTTOM

    Now I want this layer stackup

    1-TOP

    2-GND1

    3-INR1

    4-PWR1

    5-PWR2

    6-INR2

    7-GND2

    8-BOTTOM.

    Can't I just swap them or I want to follow the process of shifting and renaming?

    Regards

    Tanveer

  • Hi Tanveer, You can do this by creating a dummy layer( temp layer) in between the PWR1 and INR1, then swap the PWR1 to that temp layer and then swap the INR1 to the PWR1. so now the contents in INR1 is shifted to layer 3 and contents of PWR1 is shifted to layer4 as per your stackup. Finally delete the dummy ( temp ) layer. Follow the same procedure for INR2 and PWR2 also. Hope it will work.
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