Kevin, This is not necessarily true for diff pair stuff, when you have different widths and spacing for different layers. For instance, outer layers tend to have different spacing characteristics than inner layers (not always.. but for the point of illustration). In this case, you would NOT enter the values in the Electrical constraints/Diff pair area, but back in Physical constraints, where we're all used to doing it. The important thing here is that you would simply leave those entries blank in the Electrical constraints/Diff pair setup. Most important to get the DRC's to report properly is to make sure there is an entry for minimum line spacing for the Entire Design's diff pairs; i.e., Minimum you would find anywhere in your design. Hope this helps, Andrew -----Original Message----- From: Kevin McCowan [mailto:kmccowan@xxxxxxxxxxxxxx] Sent: Thursday, March 10, 2005 1:41 PM To: icu-pcb-forum@xxxxxxxxxxxxx Subject: [PCB_FORUM] Re: Diff pair Constraints and CM Plus you don't set the diff pair stuff with net_physical_type. You use constraints>electrical constraints. This is the new way starting with version 15. You did not specify which version you are using. Net_ph and net_space are for group to group spacings. And for constraint area spacing and widths. Kevin McCowan Sr. PCB Designer TSI telsys Reade, Sue wrote: > As best as I can figure this out. The "constraints" form overrides the > CM. So if you'd like all of the diff pairs to obey the same rules on all > layers, use CM first and only. If you have different gaps and widths on > different layers use "constraints". Setting gap is just one of those > things you have to do manually. > > -----Original Message----- > From: Dave Seymour [mailto:deseymour-pcb@xxxxxxxxxxxxx] > Sent: Thursday, March 10, 2005 4:05 PM > To: icu-pcb-forum@xxxxxxxxxxxxx > Subject: [PCB_FORUM] Diff pair Constraints and CM > > Fresh 15.2 design. > > I assign a diff pair to two nets. > > Set the diff pair spacing in the NET_PHYSICAL_TYPE = DIFF with to > 11mils. Neck witdh, gap all set. > > Assign the DIFF property to the nets. > > Assignment table correct. > > Nets route at 11mil space. Tracks obey all parameters. > > Great. > > How come the the 11 mil gap (etc) does not show in the CM on the DIFF > page? > > Thanks > Dave > > -- > Dave Seymour, CID+ > Catapult Communications Inc. > 800 Perimeter Park Dr, Suite A > Morrisville, NC 27560 > > Direct: (919)653-4249 > Main: (919)653-4180 > Fax: (919)653-4297 > > Dave.seymour@xxxxxxxxxxxx > > ----------------------------------------------------------- > 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 ? 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