How do I access into your dropbox? Thanks and regards, ~wee mei~ -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Inge Hernefjord Sent: Friday, February 15, 2013 6:22 AM To: [log in to unmask] Subject: Re: [TN] Buried/blind/stacked via layups Why not look in my Dropbox under PWB, there is a IBM article about HDI. Inge On 14 February 2013 15:44, Wayne Thayer <[log in to unmask]> wrote: > On high density boards, they are generally built on a "normal" core, > then have microvia layers added simultaneously to top and bottom, one > layer at a time (also called "sequential layup"). > > To increase density, microvias can be filled, then outer layer vias > can be stacked directly on top. > > Is it OK to do the same with the core layer vias? Fill, overplate, > then stack microvias on top of them? > > Thanks, > > Wayne Thayer > > ______________________________________________________________________ > This email has been scanned by the Symantec Email Security.cloud service. > For more information please contact helpdesk at x2960 or > [log in to unmask] > ______________________________________________________________________ > ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________ ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________