John Griessen wrote: >> Hmm.. for example, if there is some EMC consideration which might lead a >> human to make a geometric constraint, wouldn't it be possible to define >> those EMC constraints so that the toporouter can make the same decisions >> the human did, with the aid of in-layout simulation? > > Doubtful. There's never just one consideration. There's typically 6. > And three merge into a chip package or several related ones inside which > we have no physical map. Then there's the other three...
I don't doubt it is hard... > For instance what to do with analog and digital grounds on some chips like > A2Ds? > any signal crossing a gap in ground plane is bad, yet we have AGND and DGND > often. The answer(s) to this kind of question is(are) long. I don't think it would be that hard to constrain a signal to be always coupled to its return path. -Anthony _______________________________________________ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user