Re: gEDA-user: Blind and buried vias?

[Kai-Martin Knaak <kmk@xxxxxxxxxxxxxxx>]

On Tue, 29 Sep 2009 17:01:23 +0000, Michael Sokolov wrote:

>> I'm told that the OMAP3430's Package-on-Package configuration requires
>> at least six layers to get all the signals out.  Ugh.
> 
> OK, that explains the need for a lot of layers.  But how does the need
> for blind/buried vias arise?

The balls of the BGA occupy most of the real estate available on top 
layer. If all vias penetrate the hole stack, this occupation maps to all 
other layers too.

---<(kaimartin)>---
-- 
Kai-Martin Knaak                                  tel: +49-511-762-2895
Universität Hannover, Inst. für Quantenoptik      fax: +49-511-762-2211	
Welfengarten 1, 30167 Hannover           http://www.iqo.uni-hannover.de
GPG key:    http://pgp.mit.edu:11371/pks/lookup?search=Knaak+kmk&op=get



_______________________________________________
geda-user mailing list
geda-user@xxxxxxxxxxxxxx
http://www.seul.org/cgi-bin/mailman/listinfo/geda-user