Fanout

[Paul van Avesaath]

ref designs are the way to go !! but dont be scared to go up a notch in layer count.. in price it doesn't make that much difference, but in time spent it can be a Big difference. also more room makes for a better looking PCB.. if you need a very low cost high volume product then take the time and do it on as minimal amount of layers..but 99% of the time that is not the case..

[robertferanec]

That is a big topic.

But basically, this is what I normally do:
1) powers + grounds + decoupling capacitors
2) memory interface
3) differential pairs and other high speed signals
4) rest of the signals

How exactly to fanout a BGA, it depends on the technology what you can use (e.g. through hole vias only, uVIAs, vias in pad, how many layers, etc), it depends on BGA pitch, ... a lot of factors. It is not som simple to answer.

But, the best is to have a look at reference design and see how they did it.

[karimoviç]

Hello , how i can fanout the BGA ?