320pin BGA Pin Layout suggestions

Hi All,

I am looing at laying out 320pin BGA on a PCB like this one.

http://www.standardics.nxp.com/packaging/package.outlines/pdf/sot824-1.pdf

The pitch between balls is 0.5mm. The internal cpu speed is 220MHz but the
external I think is ~60MHz.

It has a JTAG port

Questions
Q1
How many PCB layers would you recommend and why

Q2
Is there anything else I should watch out for?


Any other pointers on this beast would be appreciated.


Regards
Joseph


.

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