5 Replies Latest reply on Jul 10, 2015 2:27 PM by Jerry_Suiter

    Place Via in conductive shape

    raliesch

      Hi there

       

      I have a Power resistor that has a heatsink, the heatsink pad is made with a conductive shape element (in the library). I can assign a net to the conductive shape , but i am having difficulties placing Via's in the conductive shape. The only way i founf it is to turn off the DRC, anyone know if there is another way how i can do this ?

       

      We are running on 7.9.5 soon we will upgrade to VX.1

        • 1. Re: Place Via in conductive shape
          Rehan_Iqbal

          Hi raliesch,

           

          In VX.1 the 'Add Via' dialogue has had a lot more functionality added to it - you can use it to create freeform vias, stitch contours, stitch shapes, arrays, and radial arrays. We basically took a lot of the RF functionality and now provide it with the base license.

           

          https://supportnet.mentor.com/assets/MG589037/Add_Via_Expert.mp4

           

          For EE7.9.5 I would recommend using Edit > Place > Vias to add the vias in there one at time. Make sure the 'Same net' checkbox is enabled from Setup > Setup Parameters > Via Clearances, and that 'Use Placement Outline as Via Obstruct' is not enabled within Editor Control. Also check the 'Trace to Any' clearances within CES as this is what the conductive shape is using.

           

          If all else fails, you can create a Batch DRC area around the conductive shape and run checking just on that specific area to see what the violation is.

          • 2. Re: Place Via in conductive shape
            raliesch

            Hello thanks for your response

             

            I see that this will improve a lot with VX.1 thats great, now i did try what you say, and i figure out something.

            If i change the conductive shape to GND net and then do Edit-->Place-->Via--> and select GND in the via dialog i can place the via in the conductive shape.

            If i do the same thing but having a Conductive shape on Net0 and also the via on Net0 i am not able to place the via.

             

             

            GND_Via.PNG

            Net0.PNG

            hmm i guess there is a flag somewear.

            • 3. Re: Place Via in conductive shape
              Jack

              Maybe you shouldn't consider Net0 as being "a net".

              It is just a default flag for conductive features that DON'T have a net assigned.

               

              I'm pretty sure you will not have a problem adding vias to actual nets.

               

              Jack

              • 4. Re: Place Via in conductive shape
                Rehan_Iqbal

                I can confirm the behavior is the same in VX.1 for (Net0) - you should stick to a specific net assignment if possible.

                • 5. Re: Place Via in conductive shape
                  Jerry_Suiter

                  Hello,

                   

                  The comments about Net0 are correct.  We do not allow multiple Net0 objects to connect to each other which would be bad since unused pins in a part are Net0 and you would not want to connect them all together.

                   

                  In the end you need to create a real Net for this.  You could use an existing net or the option to create unique Net0-X nets (in the project integration dialog used during Forward Annotation) which would allow you to connect lets say Net0-5 conductive shape with another Net0-5 Via/Trace because this is how we support fanout of unused pins in parts for testing.

                   

                  Regards,

                  Jerry Suiter

                  Product Marketing Director Xpedition