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How to assign values to Planes in PCB Editor ?

Trivedi

Hi All,

 I am a new user of the cadence tool - Allegro PCB Editor v 16.2. I was trying to create a stackup for a board and ran into this problem. I was creating a stackup like(only Planes):

GND 

+5V

GND

GND

+3.3V

GND

 But I don't know how to assign these values like 5V and GND to the planes. I am just writing them as I have mentioned in the subclass name, but it doesn't work that way. So can anybody help me out with how to assign the values or suggest me how to create the stackup or atleast point me to some good tutorial. It would be real helpful to me.

 Thanks in Advance

-Chinmay

  • oldmouldy

    If you are in Setup>Cross Section, you cannot have repeated subclass names, you will need to call your "GNDs", GND1, GND2 and so on, so that the subclasses have unique names.

    Having arrived at the required cross section, assuming that you want copper shapes to cover these planes, you will need to add copper shapes to the layer. From the menu, use Shape, select the shape type required, in Options, select ETCH and layer subclass, specify Type as Dynamic Copper, assign a net, draw the shape and right-click>Done to finish. Repeat this for each plane to add the copper shapes as required.

    Try the "algroshapes.pdf" in the doc\algroshapes directory of the installation, ignore the title, shapes apply to all levels of the PCB tools.

  • Trivedi

    Thanks for the prompt reply. I will go through the pdf file you asked. Meanwhile, I also found something out. I guess we can use the plane outline for assigning the value for voltages. Plane outline can be reached by: Setup -> Outlines -> Plane Outlines.

    -Chinmay

  • BillZ

    Hi,

    I supsect you are migrating from OrCAD Layout. In PCB Editor you actually have to draw the shape on the plane. Then assign the net to the shape. Similar to creating a copper pour.

    In the cross section setup I would recommend using a positive plane. It is not like Layout where you created a plane layer and gave the layer the name of the net you want to connect to.

    In the Help is a section called Best Practices I suggest reviewing the section on Shapes also.

    Regards,

    BillZ

    EMA Design Automation 

     

  • Trivedi

     Thanks BillZ.. ofcourse what you said is true. We need to draw the shape first and than we can assign the net. Well as I had specified earlier we can do it in PCB editor by going to Plane Outlines. There are many options there to draw the shape too.. and it has a form which will browse through all the nets too.. so u can assign them easily !!! 

     Thanks again for all the help. I appreciate it..!! 

  • steve

    If your plane has to match a board profile (ie contracted by a set distance) have a look at the zcopy command. Great for plane creation.

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