Anthony Blake wrote: > 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.
Actually, I meant it wouldn't be impossible. -Anthony _______________________________________________ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user