Dave,
My recommendation to make this fool proof  ( which is the method I use
because, I  have volunteered to be the fool before) ... use a split plane ,
to isolate your  channel ,  then use a 0 ohm device,  to act as the power
feed into that isolated plane area.    The DRC s will work,  as long as you
don't place the plane directly over a pin associated with the nets used on
the plane.    Always  Print your gerber files  and view the split planes.

Abdul:   I know the drcs are supposed to catch  split planes on vias  but I
have one  instance where  the drc didn't catch it.  As I mentioned it was
the only board in my Protel history that showed up with a problem. So I
remember it well.     I sent that one to Protel several years ago.

Mike Reagan
EDSI
Frederick MD




----- Original Message -----
From: Dave Eloranta <[EMAIL PROTECTED]>
To: 'Protel EDA Forum' <[EMAIL PROTECTED]>
Sent: Thursday, November 21, 2002 1:43 PM
Subject: Re: [PEDA] shorted planes due to alignment pin holes with no plane
expansion


>
> Mike
> I have no split planes passing thru the hole. I do have traces drawn in
the
> planes that channel currents.
>
> Dave
>
> -----Original Message-----
> From: Mike Reagan [mailto:[EMAIL PROTECTED]]
> Sent: Thursday, November 21, 2002 11:25 AM
> To: Protel EDA Forum
> Subject: Re: [PEDA] shorted planes due to alignment pin holes with no
> plane expansion
>
>
> Dave,
>
> You didnt mention if this was a result of  a split plane passing thru the
> hole.....This  is the only time I have ever encountered a short in which
the
> DRC did not catch it.  Actually it is the only DRC that has ever failed
for
> me.
>
> Mike
>
> ----- Original Message -----
> From: Dave Eloranta <[EMAIL PROTECTED]>
> To: 'Protel EDA Forum' <[EMAIL PROTECTED]>
> Sent: Thursday, November 21, 2002 10:07 AM
> Subject: [PEDA] shorted planes due to alignment pin holes with no plane
> expansion
>
>
> > Hi
> > I just got a 10 layer board back with the +3.3 plane shorted to the
ground
> > plane at 2 alignment pins. The design rules were set for a 14 mil power
> > plane clearance. The alignment holes are plated but do not electically
> > connected to any net. The DRC found no problem and the gerber generator
> did
> > not flash a plane clearout in the plane layers for these 2 holes.
> > We were able to remove the connector and ream the holes to isolate the
> > planes.
> >   The other feature of the rules that are different on this board from
> > others that I have done is that I have 3 additional plane clearance
rules
> > that apply to regions of the board under BGAs that require a smaller
plane
> > clearance of 12mils.
> > I am surprized that I have not run into this problem before.
> >
> > Dave Eloranta
> > [EMAIL PROTECTED]
> > Locus Inc.
> > 5540 Research Park Dr.
> > Madison, WI
> >
> >
>
>
>

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