On May 31, 2010, at 4:14 PM, Mike Bushroe wrote: > OK, I have the layout. I found that some symbols don't have explicit OR > implicit power connections.
Yep. The authors no doubt intended that they be used with separate power symbols. > Others use VDD and VSS instead of Vcc and > GND. Yep. Different authors, different conventions, different purposes, different flows, ... You have to check your symbols before you use them. That's also true of the big $$ commercial packages. Symbols are pretty universally trouble in EDA. > I found where I have moved a component slightly a caused a short > between ground an power. I got all that fixed. But every time I start > to run the power buss, I reach a point where pins are highlighted > green, but the rat lines disappear, and the DRC makes it impossible to > run a trace to the pin. I have to keep saving the layout, exiting the > program, and starting over. Even reloading the net list and displaying > the rat lines does not help. This is slowing things down quit a bit. > But I don't think I can build a 4 layer board at home, and with only > two layers, there is no ground an power planes, so I want the power and > ground lines thick and well laid out, so I don't want to rey > autorouting just yet. What I am doing wrong this time? You'll have to find a pcb expert, I don't use it. Different purposes, different flows, ... John Doty Noqsi Aerospace, Ltd. http://www.noqsi.com/ [email protected] _______________________________________________ geda-user mailing list [email protected] http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
