03/07/2003 17:59:14, Harry Selfridge <[EMAIL PROTECTED]> wrote: >You will find that nesting split planes works just fine.
Er, in my experience, that's not the case. Protel believes that _both_ planes are present in the middle, not just the inner one. If you punch a power via of the 'sausage' net down, in the 'island' section, you'll get a connection to the plane. Boom - plane short :( (This is most likely to happen if you're feeding various power supplies to a BGA - loads of vias and split planes in circles / sausages, but vias not necessarily in the 'appropriate' plane - sometimes, you need to reach tricky pins with bits of track.) > We have done >variations on that kind of nesting in several hundred designs > without problems. Perhaps the designer's guide was based on >some variation of Protel99 before it evolved into >Protel99SE+SP6. If you should find a >situation where it doesn't work - please let me know. I'm definitely seeing it on P99SE,SP6 (and previous versions). It's not a bug, it's just the way it works, annoying though it may be. However, just overlaying planes is a recipe for disaster, sooner or later. I can send you a little sample job to show it, if you need - you just have to squint carefully at the colours of the plane entry crosses (or the gerbers make it very clear)) Steve * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * 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/[EMAIL PROTECTED] * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
