[Arm-netbook] iMX6 EOMA-68 CPU Card

[joem]

On Wed, 2013-02-27 at 00:43 +0000, luke.leighton wrote:
> http://rhombus-tech.net/freescale/iMX6/news/
> 
> auto-route success!  next on to design validation (clearance etc.)
> illustration of what an actual iMX6 EOMA-68 CPU would look like has
> been made.
> 
> last bits needed: confirm the true PCB size (believed to be 47.5 x
> 78mm) with litkconn.... who don't *have* a "recommended PCB layout"
> (!!) so i am dragging it out of them through a well-known process
> colloquially referred to in the technical trade as "20 questions".
> the board can then be padded out (much easier than trying to reduce
> its size)....

Very impressive!

A few questions for my reference:
1. What via hole sizes do you use inside the BGA area?
2. minimum track widths in that area + track clearances
3. Clearances for the BGA pads, and
4. Clearances for the via