[PCB_FORUM] Re: mysterious via shifting
- From: Don.Kost@xxxxxxxxxxx
- To: icu-pcb-forum@xxxxxxxxxxxxx
- Date: Fri, 19 May 2006 08:16:48 -0400
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
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