[gta02-core] Board parameters update

[Álvaro Lopes]

Werner Almesberger wrote:
> ?lvaro Lopes wrote:
>> Not good for RF lines - vias introduce a lot of reflection.
> 
> So you'd keep RF on the surface ? And RF signals crossing a can
> boundary get a hole in the can ? I now see that this seems to be
> what has been done with GPS.

Yes, that's exactly it. Same reason to avoid 90 degree direction changes in RF lines - reflection.

>> BOTTOM: components + routing
>> L7: ground (less strict)
>> L6: routing + ground
>> L5: ground (strict) ??
>> L4: (power routing ?)
>> L3: ground (strict) ??
>> L2: power
>> TOP: components, routing
> 
> So you'd start with 8 layers and then see if two of them end up
> bring avoidable ?

No, I think we should start with a 6 layer. Unless someone disagrees. I was just stating what I think is current FR PCB layer structure.

> 
>> Current design has many. Not sure we can avoid buried vias at all.
> 
> The fewer layers we have, the less difference there is between a
> buried and a blind via ;-))

True, true :)

Álvaro