Re: gEDA-user: Toporouter Changes

[Anthony Blake <tonyb33@xxxxxxxxx>]

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


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