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Error: Padstacks missing thermal/antipad definitions?

bnaden

Hey everyone,

 Background: I am new to Cadence, and am going through a simple tutorial on how to create a 555 LED blinker circuit using the Cadence suite. Following the tutorial, I drew the schematic in OrCAD, created a few custom pads and footprints, placed the components in Allegro, and autorouted the board.

 Everything went smoothly until it came time to export the gerbers/artwork.  The signal, silkscreen, and soldermask films export fine, but the power and ground films both have the error

Padstacks missing thermal/antipad definitions: throughhole_padstack, pad60cir36

 I created the throughhole_padstack, but I do not recall using or assigning pad60cir36 ever in the tutorial. If anybody knows of an obvious/common fix, I appreciate the help!

  • bnaden

    I realize that my problem is a bit vague, especially if you aren't actually in front of the files to look at them. So if I can clarify it in any way, please let me know. Again, I do not know what the error "Padstacks missing thermal/antipad definition" means.

  • steve

    It sounds like you are using negative artworks on the planes or have the shapes defined to use Thermal / Anti pads. The reason for the error is that the padstacks do not have a thermal / anti pad defined. Open the padstacks you created and add a thermal / anti pad definition then try again. Or use positive shapes.

  • bnaden

     Thanks for the help steve. I believe I ended up solving the problem by changing the Device type from 6x00 to Gerber RS274X under the Artwork Control Form. After that, the Gerbers were created without errors. I am pretty sure that the thermal pads were already defined (they were specified as flash), so I still don't understand why there was a problem exporting as a 6x00 format. I won't worry about that right now, though.

      Anyway, thanks again for the help! I really appreciate it.

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