Hello, I'm a happy GSchem + PCB user for quite a few years now, but I'm still puzzled about one aspect of defining symbols and footprints, and that is "special" pins and pads. With "special" I mean the following types of pins/pads:
- Internally connected pins and pads, e.g. SO8 MOSFETs with S on pins 1-3, G on pin 4, and D on pins 5-8. I can of course create a GSchem symbol with 3 pins for S and 4 pins for D, but is there a more elegant way in GSchem to deal with this? - So-called "don't care" pins and pads, e.g. mounting pads for SMD connectors. I found that I can at least connect these to each other when I give them all pin number 0 (zero), but I can't connect these to any net (e.g. Gnd) in the circuit without the DRC check crying foul. Is there a way to define these pads in such a way that PCB doesn't care to which net each one is connected? - Pure holes (e.g. for plastic positioning nubs of SMD connectors): these often fail DRC check when too close to copper surfaces (e.g. mouting pads) -- probably because mounting holes are genarally used with metal screws. Ideally, one should be able to define the following types of pins/pads: 1. Unique pins (one pin number each, one pinseq number each) 2. Interconnected pins (range of pin numbers, one pinseq number) 3. True don't care pins (each can be connected to any net, or no net at all) 4. Interconnected don't care pins (all pins can be connected to one particular net, or no net at all, e.g. with connector mounting holes). Am I correct in surmising that gEDA currently only accomodates type 1? If not, how can I define these special pins/pads, both in Gschem's symbols and PCB's footprints? Yes, I dug up quite a lot of previous discussions on this subject, but no clear solutions or references to manuals. Thanks in advance, Best regards, Richard Rasker _______________________________________________ geda-user mailing list [email protected] http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
