Re: gEDA-user: Toporouter Changes

[Anthony Blake <tonyb33@xxxxxxxxx>]

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



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