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 [email protected] http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
