gEDA-user: Layers and Buried/Blind Vias in gEDA

[Gus Fantanas <fantanas@xxxxxxxxxxxx>]

Hello all,

While following the discussion about layers, I wondered if the 
capability to handle buried/blind vias could be implemented in gEDA.  I 
would think that not only a buried/blind via should "know" which layers 
it spans, but also each layer should be "aware" which layer it is 
above.  While submitting gEDA layouts to Sunstone Circuits, I was asked 
about layer mapping (and I presume that other PCB fab houses have 
similar requirements).  I think that if I interchange two inner layers 
when declaring the mapping of gerber files to actual layers, the board 
will still come out alright (although its EMC performance may be 
compromised) because the vias span all physical layers.  That might NOT 
be the case if buried/blind vias were used because (inner) layer 
transposition may disturb the continuity of a buried /blind via.  (The 
outer layers cannot be interchanged with other layers because physical 
components are soldered on them.)

I thought that discussing buried/blind vias in gEDA is very much related 
to the lively discussion about layers.


Regards,

Gus Fantanas



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