[PCB_FORUM] Re: Removing unused pad rings on inner layers DURING design...

Hi Austin-

Not that it helps, but it's a breeze in VeriBest.

I don't know how you'd do it in Allegro, but I'm still in the steep-ish
part of the learning curve with Cadence tools. Since the pads ARE the pins,
I see no way other than by doing as you said - building custom padstacks
with all the possible inner layer combinations, then manually editing each
through hole. And having never tried that, I don't even have a guess what
the planes and drc's would do. I'd be afraid of inner layer shorts I
couldn't see. Maybe if you made pads the size of the drill (not the
finished hole) instead of no pads, then suppressed them in gerber, you'd
get the right effect with your planes and drc's.

-Chris



                                                                                
                       
                       "Austin Franklin"                                        
                       
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[PCB_FORUM] Re: Removing unused   
                                                           pad rings on inner 
layers DURING design...  
                       03/31/2005 01:03 PM                                      
                       
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Hi Oleg,

> I think during design you do need pads on all layers in order to
> have proper
> DRC.

There is no design requirement to have pads on all layers, only when they
are connected to a trace on a particular layer (outer layers aside).  With
the pad ring removed, the clearance is not trace to pad, but trace to drill
instead.  This gives a lot more routing room between vias.  As I mentioned,
I do this very thing routinely, but with custom pad stacks.  And, as you
note, this is routinely done during fabrication as well, so why can't the
tool do it during design (or can it, and that's my question)?

Regards,

Austin


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