[gta02-core] Board parameters update

Werner Almesberger werner at openmoko.org
Fri Aug 28 18:17:04 CEST 2009

?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.

> 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 ?

> 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 ;-))

- Werner

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