David, So you are saying that the padstack should be using "drill to copper" by default (no pads); If there is a connection on a particular inner layer, a pre defined pad size should be used Instead. I like that. Thanks, Julian -----Original Message----- From: David Greig [mailto:david@xxxxxxxxxxxxxx] Sent: Thursday, March 31, 2005 11:14 AM To: icu-pcb-forum@xxxxxxxxxxxxx Subject: [PCB_FORUM] Re: Removing unused pad rings on inner layers DURING design... Hi Austin, There does not seem to be any way of doing this. I too prefer to err towards drill to copper clearances rather than have unused pads. Certainly for power planes under area array devices this significantly reduces the colander effect, and so long as one is aware of CAF this is preferable. Designing without non-functional pads is highly preferable for the very reason that some 3D solver translators still include them even if the padstack is optional. If only normal routing would choose an appropriate padstack in the same way as blind/buried. Padstack editor unfortunately does not allow a blind/buried definition if both top and bottom pads are defined. There is no easy workaround. If Cadence are listening, please remove some of the formal hard coded rules and allow drilled vias with selective internal pads to be used in the same way as blind/buried. A drill to copper clearance rule set would also be nice... Best Regards David Greig ______________________________ GigaDyne Ltd Buchan House Carnegie Campus Dunfermline KY11 8PL United Kingdom t: +44 (0)1383 624 975 http://www.gigadyne.co.uk ______________________________ -----Original Message----- From: Austin Franklin [mailto:austin@xxxxxxxxxxxx] Sent: 2005-March-31 18:29 To: icu-pcb-forum@xxxxxxxxxxxxx Subject: [PCB_FORUM] Removing unused pad rings on inner layers DURING design... Hi, Is there a way to not have inner layer pad rings show up unless a trace is connected to it on that specific layer? I know that the pad rings can be removed by the fabricator, but I want to remove them during design to allow for more clearance for routing between vias. How I've handled this in another tool is to set-up custom padstacks that have pad rings only on the two outer layers, and the one internal layer. It worked fine, but obviously required more work when picking vias. 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 ----------------------------------------------------------- -- Virus scanned by Lumison. ----------------------------------------------------------- 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 -----------------------------------------------------------