On Sat, 2009-02-28 at 16:51 -0800, Ben Jackson wrote: > I just spent a couple hours debugging a half-broken AVR microcontroller > which was due to me putting GND and "UGND" (USB GND) far apart on the > symbol and forgetting to connect GND. I probably spaced them that way > to get a nice balance of left and right side pins on my box symbol. > > Perhaps I will figure out how to use the DRC backends of gnetlist now... >
Sorry, I can not really see the conclusion of your message. UGND pin for USB should be near to the other USB related pins, I think. A uC often has multiple ground pins, which all need connection to ground. I often put them on the bottom side of the package. I have just looked on my http://www.gedasymbols.org/user/stefan_salewski/symbols/AT90USB1287-3.sym there is one more GND pin near XTAL pins -- I think position is good because quartz will need a connection from XTAL to GND. Would you suggest to modify the symbols? Some people prefer symbols identical to package shape , this is available too: http://www.gedasymbols.org/user/stefan_salewski/symbols/AT90USB1287-1.sym I think some time ago I suggest an additional pin attribute which indicate if a pin can be left floating or needs a connection. This may help. Best reagrds Stefan Salewski _______________________________________________ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user