Hi,

Can someone explain me briefly how works the communication between the ARM9263 and DM9161A? Because we designed a unit based in these components and some of them are not taking IP.

I really appreciate your help. Thanks !!!

PS: I am attached the schematics.

Any idea?

If only some boards are marginal/malfunctioning you should revisit the placed components and soldering.

If it's not a problem with physical topology or components, you could try some 9263-EK boards and see if they behave in a similar manner.

Not sure I understand the merit of doubling up all the decoupling caps. How many board layers, power planes do you have. Do you have some gerbers, they'd be more interesting than pretty much the 9263-EK reference circuit.