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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