On Thu, 04 Aug 2011 01:48:09 +0200 Kai-Martin Knaak <kmk@xxxxxxxxxxxxxxx> wrote: > Colin D Bennett wrote: > > > A feature I have heard previously requested is to be able to mark > > certain layers as âno-DRCâ. For instance, to allow special trace > > elements such as antennas that the DRC thinks are incorrect shorts > > between two nets. > > These should be omited from update_rats, rather than be ignored on > DRC. The DRC as it is currently implemented, does not check for > correct connectivty. It does not detect a short. Oh, that's right. I forgot since I tend to consider the Optimize Rats action and its feedback as a first pass of DRC, and the actual DRC action as a more detailed pass... but it seems like it would be ideal for a short to be detected by DRC. > I think, this > functionality would be best implemented with a flag > "don-t-check-connectivity" added to the object. Put these antennas in > a separate layer and make DRC special for this layer would still feel > like a crutch. My current workaround is to actually connect the antenna input directly to ground on the schematic, so that pcb does not complain that the PCB trace antenna is a short. (See attached figure from the schematic.) For this specific and simple purpose, this works well enough for the moment. Regards, Colin
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