Ian, it's actually pretty easy to "loose parts". We recently have had a situation where a group of components have been unknowingly moved into the negative region of the database as part of a move selection process early in the placement stage. It turns out that the syncroniser matches the parts and the pins for the nets....therefore no missing components.....The netlist exists in the database but the physical ratsnest does not (I assume the physical ratsnest is only valid for the database extents). The DRC was 100% ok. It would appear that the DRC makes the assumption that if there is a valid net but no ratsnest then the net must be connected. (ie no broken net) (also no clearance errors either)
I would be interested if anyone else has had this problem. We use SP6, W98 We only found it by noticing an associated text string on the left hand edge of the database area when zoomed right out. -----Original Message----- From: Ian Wilson [mailto:[EMAIL PROTECTED]] Sent: Thursday, 25 October 2001 8:36 AM To: Protel EDA Forum Subject: Re: [PEDA] Urgent help needed On 03:07 PM 24/10/2001 -0700, Abd ul-Rahman Lomax said: >At 07:52 AM 10/24/01 +0200, Emanuel Zimmermann wrote: >>Maybe that the reference point for the .lib part moved for whatever reason. >>This can cause the component to be placed out of the working area after >>update >>PCB operation. > >Good thinking. > >Yes, that would do it, and it is not a terribly uncommon error. Move >Component, clicked onto an empty space, will pull up a list of components, >which will allow picking the component up. One will be able to tell >immediately what its extents are when it is being moved. Editing it from >the panel is another possibility, just change the XY coordinates by adding >or subtracting appropriate values (remember, Protel will think that the >component is at the reference position, which in this case will *not* be >where the primitives are located. This is exactly why I suggested that the netlist or component report should be checked or even just use J-C to see if the component is still around somewhere. Though I suspect that this is not happening in this case as it would be pretty hard to loose a large BGA package due to a shift - you would think you would notice it sitting around somewhere. The ratsnest would certainly show something interesting. Ian Wilson * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * To post a message: mailto:[EMAIL PROTECTED] * * To leave this list visit: * http://www.techservinc.com/protelusers/leave.html * * Contact the list manager: * mailto:[EMAIL PROTECTED] * * Forum Guidelines Rules: * http://www.techservinc.com/protelusers/forumrules.html * * Browse or Search previous postings: * http://www.mail-archive.com/proteledaforum@techservinc.com * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
