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Antenna report not finding stubs

OLY29

Have the version 17.2 S069 for layout using Windows 10. Want to find out if this is a bug or just something we are missing. Have a board with connectors and on one pin the pour going to the pin is a solid pour (pin is flooded over top and bottom layers) I had a short stub on this pin and after running the report it did not pick up the stub. Before we loaded the latest hot fix it would always catch this type of stub. The picture shows a stub coming from a SMT pad going into a pour that is the same net as the pin. We were using version S060 before and it would flag this type of stub. So if you have spare time could you try to see if it does the same on your version. This might be fixed in 17.4 but we haven't loaded that version yet.

The board in the picture does not flag the stub with our version.

  • Hmmm....I've never seen Allegro flag that cline from the SMT pin to the flood as a dangle or antenna.  If both ends are connected (in your case they are) that is considered ok.  You need to have one end truly unconnected to get the error.  I verified in S060 this is NOT flagged.

  • So I added a stub to the via shown in the picture and it still doesn't find the stub. This seems to be hit or miss as I added a small stub to a via not shown in the picture and also on on the GND_POWER via and it picked up both. I then added a stub to another GND_EARTH via and it did not pick that one up.  

  • in reply to OLY29

    wondering if Cadence went the extra mile and added code that ignores antennas covered by copper?   

    Does it get flagged if you trim the shape back temporarily and ran a check?

  • One more place to look since things have moved around a bit.  See if you have this feature check turned on:

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