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 How to connect a via in few GND layers while disconnecting it on remaining GND layers 

Last post Fri, Aug 30 2013 9:32 PM by redwire. 2 replies.
Started by Khurram 29 Aug 2013 11:43 AM. Topic has 2 replies and 338 views
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  • Thu, Aug 29 2013 11:43 AM

    • Khurram
    • Top 200 Contributor
    • Joined on Sat, May 16 2009
    • Karachi, Pakistan
    • Posts 41
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    How to connect a via in few GND layers while disconnecting it on remaining GND layers Reply
    Hello All,

    Is there any other way to connect a via(having GND net) on few GND layers and disconnect it from the remaining GND layers. The two ways I know are with limitations as below

    • To create route keepout/void on the layers where connections are not required but if there are lots of location where I need to create voids with lots of GND layers in stack up, then by following this process file size become too heavy.
    • By adding a flash symbol of a circle in the thermal definition of pad stack in the layers where connections are not required, but the problem with this method is that when you accidently apply that flash symbol in all GND layers instead of few layers then allegro will not show it as un-routed net in BRD because allegro assume that this pad stack is connected although pad stack is actually not connected.

    No Shape connect will not solve this problem as by applying it via will not connect in all layer but I want it to connect in certain layers. If anyone of you have its solution/suggestion then please comment. Thanks

    Khurram
    • Post Points: 35
  • Thu, Aug 29 2013 9:26 PM

    • Ravinsu
    • Not Ranked
    • Joined on Mon, Dec 19 2011
    • Posts 8
    • Points 100
    Re: How to connect a via in few GND layers while disconnecting it on remaining GND layers Reply

    Can you try, Manual Void.

    Shape-->Manual Void 

     

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    • Post Points: 5
  • Fri, Aug 30 2013 9:32 PM

    • redwire
    • Top 10 Contributor
    • Joined on Wed, Jul 16 2008
    • Allen, TX
    • Posts 872
    • Points 13,450
    Re: How to connect a via in few GND layers while disconnecting it on remaining GND layers Reply

    You can do the following:

    1) Edit->Properties

    2) In the FIND filter, select VIA

    3) Select the via

    4) Add the property "No Shape Connect"

    5) Done

    This will disconnect the via from all the ground layers.  Now you can route the connection on the plane layers you want.

    Or if you want this for all of your ground vias, you can use a custom via that does not connect on certain layers.  Be sure to add that custom via to the available via list in the constraint manager for that net.

     

    • Post Points: 5
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Started by Khurram at 29 Aug 2013 11:43 AM. Topic has 2 replies.