Stats

  • State Not Answered
  • Replies 1
  • Subscribers 160
  • Views 9788
  • Members are here 0
More Content

Unable to connect trace due to wrong representation of the part

Neil mustafa

Hello all,

I am trying to route my netlist but It won't let me make the connection and I think it is due to it not showing what it really is in reality and I haven't figured out how to do it and would like to get some help on it.

Here are some pictures to better layout the problem:

As you can see in the picture according to my netlist there should be a trace between part E4 and my Chassis ground (The circle in the top left corner). Now what I am trying to do with that hole is create a non-plated throughhole but a screw is going to go on top of it. So I tried to create a pad around that hole by creating a circular pad with a larger diameter with no offset using padstack editor but that doesn't seem to solve the problem.

I right click on that top left circle my chassis ground, chose modify with padstack editor -> single instance. Then under design layers I change the diameter of the pad to 220mils , with the drill hole size set to 160 mils as shown below:

Then I click on files , update design and exit, then I get the message:

Despite having chosen the pad diameter to be 220 mils which is surely larger than 160 mils.

Now after going back to my board the pad looks just as big as my drill hole and I am unable to route it  and I get this after trying to route (The DRC cursor shows up If I try to route):

Any ideas how to achieve what I am trying to achieve? BTW This is going to be a 1 layer board TOP only. Despite it showing 4 layers in the padstack design. I haven't figured out how to delete the other layers but I am able to add more for some reason. I am just going to export gerbers for my top layer to get around this. If you have an additional advice for me on how to convert this to a 1 layer template that would be highly appreciated as well. Thank you all!

Neil Mustafa.

  • 0

    So the error with respect to the padstack getting drilled away is because you have a drill hole size of 160Mil & you also have a internal pad of 160Mil, IL2, IL3, Default internal, so the system will see that as a potential error.

    The first thing to do is get the padstack sorted out. It wont matter on the board if it is a multi-layer design or a single layer.

    Go with.

    Begin Layer 220 Mil
    Default Internal 220 Mil
    End Layer 220Mil

    SolderMask_top & bottom 240 Mil " Soldermask will be oversized by 10Mil on the pad.

    Drill 160 mil

    Save your padstack.

    In the PCB editor since you are wanting to design a single layer board then you need to modify the "Board Cross Section" - "Xsection" Doing this will remove any routing layers that are not needed. Ideally the xsection should be set as a 2 layer board even though you only want to use 1 layer.

    In here you should have

    Surface = Air
    Top = Conductor
    Dieletric = FR4
    Bottom = Conductor

    Hope this helps you out.

Cadence Guidelines

Community Guidelines

The Cadence Design Communities support Cadence users and technologists interacting to exchange ideas, news, technical information, and best practices to solve problems and get the most from Cadence technology. The community is open to everyone, and to provide the most value, we require participants to follow our Community Guidelines that facilitate a quality exchange of ideas and information. By accessing, contributing, using or downloading any materials from the site, you agree to be bound by the full Community Guidelines.