This might help
http://iconnect007.com/ads/mentor/regform.php

What class 3 constraint is giving you difficulty?
(not sure what the class designation has to do with routing, maybe I
haven't had enough coffee today!)

Jack


On Fri, Feb 21, 2014 at 4:40 AM, Larry Brophy <[log in to unmask]> wrote:

> I'm looking for a reference design that will meet Class 3 to fan out a 121
> pin 0.5mm BGA, does anyone know where I can find one?
>
> Many thanks for your help,
>
> Larry
>
>
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