Hello Yuji Matsunami,
There is not an application note per se, but there is a Reference Design with the i.MX6UL and the PF3000 (which is very similar to the i.MX6ULL, as you can see on AN5350) albeit this Reference Design is not public, so I would need to ask you to please open a ticket requesting the Design Files for this Reference Design.
My apologies for the inconvenience.
Regards,