Oleg, Not sure what your motivation here is. By properly defining your vias, line widths and spacings you should be able to route two lines through even 1mm BGAs (unless you boards have high aspect ratios). Attempting to use the drill hole as you clearance can be dangerous for high speed nets. You could actually get the line close enough to the hole that it is not referencing the plane. With dielectric thickness going down I find my line widths are actually getting too narrow. In really tight areas where you have trouble getting one line through (< 1mm BGA etc.) I use a constraint area to define a smaller line to via spacing but also increase the line to line spacing in the constraint area to Not Allow a route past pins with connections on that layer. This will allow a route past unconnected pins and when the vias are removed you have your additional spacing. Regards, Gerry Gerry Meier Sr. PCB Designer Freedom CAD Services, Inc. Voice: (603) 864-1300 x1350 Alt. Voice: (386) 753-0048 Email: gerry.meier@xxxxxxxxxxxxxx visit our website at<http://www.freedomcad.com -----Original Message----- From: Austin Franklin [mailto:austin@xxxxxxxxxxxx] Sent: Thursday, March 31, 2005 1:03 PM To: icu-pcb-forum@xxxxxxxxxxxxx Subject: [PCB_FORUM] Re: Removing unused pad rings on inner layers DURING design... Hi Oleg, > I think during design you do need pads on all layers in order to have > proper DRC. There is no design requirement to have pads on all layers, only when they are connected to a trace on a particular layer (outer layers aside). With the pad ring removed, the clearance is not trace to pad, but trace to drill instead. This gives a lot more routing room between vias. As I mentioned, I do this very thing routinely, but with custom pad stacks. And, as you note, this is routinely done during fabrication as well, so why can't the tool do it during design (or can it, and that's my question)? Regards, Austin ----------------------------------------------------------- To subscribe/unsubscribe: Send a message to icu-pcb-forum-request@xxxxxxxxxxxxx with a subject of subscribe or unsubscribe To view the archives of this list please login at //www.freelists.org. Our list name is icu-pcb-forum or go to //www.freelists.org/archives/icu-pcb-forum/ Problems or Questions: Send an email to icu-pcb-forum-admins@xxxxxxxxxxxxx Want to post a job listing ? DON'T DO IT HERE! Better yet, join our jobs listing forum. SUBSCRIBE: icu-jobs-forum-subscribe@xxxxxxxxxx POST: icu-jobs-forum@xxxxxxxxxx ----------------------------------------------------------- ----------------------------------------------------------- To subscribe/unsubscribe: Send a message to icu-pcb-forum-request@xxxxxxxxxxxxx with a subject of subscribe or unsubscribe To view the archives of this list please login at //www.freelists.org. Our list name is icu-pcb-forum or go to //www.freelists.org/archives/icu-pcb-forum/ Problems or Questions: Send an email to icu-pcb-forum-admins@xxxxxxxxxxxxx Want to post a job listing ? DON'T DO IT HERE! Better yet, join our jobs listing forum. SUBSCRIBE: icu-jobs-forum-subscribe@xxxxxxxxxx POST: icu-jobs-forum@xxxxxxxxxx -----------------------------------------------------------