Message-ID: <4F5DD38F.1020300@gmail.com>
Date: Mon, 12 Mar 2012 16:14:31 +0530
From: Abhijit Kshirsagar <abhijit86k AT gmail DOT com>
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To: geda-user AT delorie DOT com
Subject: Re: [geda-user] Very confused...possible PCB bug?  Need help.
References: <4F5DCE76 DOT 1060304 AT neurotica DOT com>
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Reply-To: geda-user AT delorie DOT com

Did you use 'J' key to join a track to a rectangle?

~Abhijit


On Monday 12 March 2012 03:52 PM, Dave McGuire wrote:
>
>   Ok, I hate to ask this, for the obvious reason...but I wonder if 
> I've found a bizarre bug in PCB.  I could really use a hand with this 
> one. This is with the 20110918 snapshot.  I'm using the standard flow 
> of gschem -> gsch2pcb -> pcb.
>
>   Here's what's going on.  I'm working on a small two-sided board, 
> mostly surface mount.  It's very close to done, but the message log 
> keeps telling me that the +3.3V net is shorted to the GND net, and 
> vice-versa.  But I've been going over this for a solid day (a 14 hour 
> day in fact!) and I cannot find this short!
>
>   I don't know when this supposed short crept in, as I generally don't 
> keep the message log open as I'm routing.
>
>   When I hit "o", a via and a pin of a connector are highlighted in 
> orange.  They both have thermals to the to board-sized rectangle (I 
> have board-spanning rectangles for 3.3V and GND on the top and bottom) 
> but I've gone over them very carefully and they don't seem to be in 
> play. Now here's where things get weird...which vias and pins are 
> highlighted in orange are not consistent!  If I delete the connector 
> whose pin gets highlighted, then hit "o" again, of course I'll get all 
> sorts of "not found" messages in the log due to the missing connector, 
> but a DIFFERENT pin on a different connector then gets highlighted in 
> orange.
>
>   If I delete the GND and 3.3V planes, the supposed short remains.  If 
> I delete all connections to the orange-highlighted pins, that doesn't 
> get rid of it either.  I've looked at it a zillion different ways and 
> tried a zillion different things (looked for hidden pieces of former 
> traces lying around, etc) and nothing has gotten me past this.
>
>   It's worth mentioning that I've designed about five boards with this 
> flow on this exact set of software, on this system, with no changes 
> save for a few added symbols and footprints.  All the way to copper 
> deployed in the field, no problems whatsoever.  This stuff works 
> great, as always.  Until this weird situation.
>
>   Are there any known conditions in which PCB might think that two 
> nets are shorted when they actually aren't?  Does anyone have any 
> suggestions as to how I might chase this?
>
>               -Dave
>