Honored Contributor
Honored ContributorYou've stated several times in this thread that you're using the RX631 in a 169 BGA package, but the package in your block diagram is clearly not a BGA. That's really not important to the discussion here but it indicates a lack of knowledge on your part about what you're doing. You have still not said what data will be passing between the FPGA and microcontroller, which is critical to knowing what kind of interface is needed. Is the interface just used for reading and writing FPGA registers? If so then a serial interface would probably suffice. If you're passing packets back and forth then the parallel interface is probably needed, but do you really need 15 address lines?
The more information you provide about your application the better advice you'll get from the nice people here who are trying to help you.
