Folks, This brings about another issue Michael M mentioned " Besides seeing some vias and orphaned subnets getting latched to 0V nets or some other DC Supply shape fills, " Is there a best practice avoiding this from happening? Even when the dynamic shape files being disabled, 'hanging' clines and vias' get attached to 0V nets . Another thing is sometimes they end up as Dummy Nets (which you could hilite and look for) or "Not on a Net". I worry I might have some of this on my design, but how do I find them? rgds, Good Food in Penang Penang Info Just about Anything and Everything --- On Tue, 11/11/08, Baumstark Michael-EMB043 <M.Baumstark@xxxxxxxxxxxx> wrote: From: Baumstark Michael-EMB043 <M.Baumstark@xxxxxxxxxxxx> Subject: [PCB_FORUM] Re: Replacing ripped up etch? To: icu-pcb-forum@xxxxxxxxxxxxx Date: Tuesday, November 11, 2008, 1:35 AM Hi Mike C.: I know this thread is over a week old at this point but I wanted to also comment about your suggestion for the "Derive Connectivity" application.... in response to Dharma's inquiry. We too have utilized this feature, on occasion, when the nets just don't quite latch properly to their intended intelligent net, particularly for some of those design migrations from one CAD tool to an Allegro PCB layout. We have found some strange behavior when "Derive Connectivity" is performed with the presence of Positive image Shape Fills. Besides seeing some vias and orphaned subnets getting latched to 0V nets or some other DC Supply shape fills, some Cline segs will get permanently fused to the Shape fills that they have been derived to, instead of perhaps Logical pins that are also in proximity. That was a strange observation with no ability to remove the Cline segs at a later time, so we have learned to avoid that particular situation and to be a bit more judicious into the place and time when Derive Connectivity is executed. So what we have determined and experienced as the best practice is to remove OR move (outside of the PCB outline) all Shape fills that are co-mingled with signal routing. (Dedicated positive plane shape can stay.) After the Derive Connectivity is performed then the Shape fills can be moved back into position. Sincerely yours, Michael Baumstark Sr. Staff Electrical Engineer / PCB Design, CID+ Motorola - Government & Public Safety Physical Design Organization (G&PS - PDO) 8000 West Sunrise Blvd. Mail Stop: 8E8 Plantation, FL USA 33322-9947 Intra: http://rprc.mot.com ; http://pcbadvisor.mot.com web: http://www.motorola.com -------------^------------------^-----------------^------------------^-- ------------ >---^-.--- >---^-.--- >---^-.--- Motorola Internal Use [ ] Motorola Confidential Proprietary [ ] -----Original Message----- From: icu-pcb-forum-bounce@xxxxxxxxxxxxx [mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Michael Catrambone Sent: Thursday, October 30, 2008 12:56 PM To: icu-pcb-forum@xxxxxxxxxxxxx Subject: [PCB_FORUM] Re: Replacing ripped up etch? Hello, Did you try running Derive Connectivity? (Tools > Derive Connectivity) In order for Allegro to see a routed connection it must be snapped to the center of the pin or via and sometimes during conversions things round the wrong way which makes the trace not exactly in the center of the pin or via. "Derive Connectivity" will attempt to resolve these conditions and maybe it will help with yours. I would give it a try. When you run "Derive Connectivity" check the box next to "Convert Lines to Connect Lines" the click OK. (Save a backup of the database of course before running anything like this) Hope this helps, Michael Catrambone UTStarcom, Inc. -----Original Message----- From: icu-pcb-forum-bounce@xxxxxxxxxxxxx [mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Dharma Kemp-Bresett Sent: Thursday, October 30, 2008 11:31 AM To: icu-pcb-forum@xxxxxxxxxxxxx Subject: [PCB_FORUM] Replacing ripped up etch? Hi Everyone, Hopefully this one is as easy to solve as the last question I posted. :-) We have a board file that was converted from pads but has an orcad sch. We are now synching the converted brd file with the sch. We had to remove a bunch of pins from some bgas that were okay in pads but we didn't want in allegro. I have loaded the netlist and replaced the few symbols that wouldn't place, or refresh, automatically (due to the "missing pins") but now I have a bunch of routes that have become rats. These appear to be ones that went from the offending symbols to other offending symbols so its not all rats for these refdes but only a few per refdes with multiple refdes involved. I have tried everything I can think of in every combination I can think of to no avail. So the million dollar question is: Is there a way to get those routes back without having to go through by hand and make a clip file? Something similar to a placement file but for routes, maybe? Thanks in advance, Dharma KAW/USA Ltd. 39 Simon Street, #4 Nashua, NH 03060 603-886-8711 x212 603-881-8763 fax Confidentiality Notice: This email and any accompanying documents contain information that is confidential, privileged or exempt from disclosure under applicable law and is intended for the exclusive use of the addressee. This information is private and protected by law. 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