[PCB_FORUM] Re: nets shorted to gnd plane

I think it is most likely you turned on a layer with etch and or lines
in creating your artwork, that isn't supposed to be there. Allegro
doesn't care about whether you used neg or pos shapes. The drc check in
allegro will catch shorts.

But Allegro doesn't know if you created your art work correctly.

Ask the fab house to send you a pdf snap shot and or just any type of
screen shot, showing the error, once you see what the fab house see's,
you can probably correct the problem.

 

Blake Moore

ADI

 

 

 

From: icu-pcb-forum-bounce@xxxxxxxxxxxxx
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Cosentino, Tony
Sent: Monday, July 20, 2009 4:31 PM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: nets shorted to gnd plane

 

Sam, 

 

I assume you are using negative planes with splits or you have an
attribute assigned that allows those nets to short or the short is being
applied by a layer turned on in the artwork films that is not part of
your stackup. There are other situations that can cause shorting not
detected in Allegro but these are common ones. 

 

We use a third party CAM tool on all jobs before sending Gerber's out.
You might want to consider doing this on future designs. There are many
CAM tools out there that will allow you to perform netlist to Gerber
compares that are not too expensive.

 

Thanks

Tony Cosentino

________________________________

From: icu-pcb-forum-bounce@xxxxxxxxxxxxx
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of CHRIS LANZA
Sent: Monday, July 20, 2009 4:17 PM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: nets shorted to gnd plane

Welcome to the wonderful world of Allegro

 

________________________________

From: icu-pcb-forum-bounce@xxxxxxxxxxxxx
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of
sjchar3@xxxxxxxxxxxx
Sent: Monday, July 20, 2009 2:54 PM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] nets shorted to gnd plane

 

Group, I sent gerbers out and board house pointed out nets were shorted
to plane. I ran DRC and I didn't have nets shorted errors, this
shouldn't be. 

Sam

 

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