[PCB_FORUM] Re: mysterious via shifting

Interesting... I had tried the "Fanout by Pick" command at one point at 
another area of the board... I did not get a fanout and decided not to 
pursue experimentation with the "Fanout by Pick" command.

I just tried to reproduce the problem with no success and I also did a 
search at SourceLink with no success.

Are you able to use "Fanout by Pick"?... Just curious.




Don.Kost@xxxxxxxxxxx 
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05/19/2006 08:16 AM
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[PCB_FORUM] Re: mysterious via shifting







Ed, 
I've seen this problem occasionally when using "Fanout by Pick".  Seems 
like it happens to some bga's but not all. Cadence was unable to reproduce 
this problem. 
Don ...........................



Ed Caldwell <Ed.Caldwell@xxxxxxxxxx> 
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05/19/2006 08:10 AM 

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[PCB_FORUM] mysterious via shifting









Anyone experience a mysterious shifting of vias in Allegro 15.2 s126 
(v15-2-51EU) (12/14/2005) i86... ? 

The design is in mils to 2 decimal places. The vias are in a 0.8 mm BGA 
(spaced at 31.50 mils apart). Somehow the group of vias within the 
rectangle pictured below shifted by 0.10 mils sometime during my edits - 
cause unknown... 



It is important to note that I did not change the database resolution - it 
has remained (mils to two decimal places). The only thing I changed was 
the routing grid which I switched between 25 mils, 5 mils and 0.1 mils as 
I was working in different areas of the layout and I was not working in 
the area where the vias shifted. 

Puzzl_Ed 

Ed Caldwell 
Electronic Design Services, LLC 
Canton, GA - USA

JPEG image

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