DDR2 pin assignment

ddr pins work with the other ddr pins.

it should be assigned with same group of dq-pins and dqs pins.

however, if you want to know which location should be good for your system.

remove pin assignment and compile the project.

and use back-annotate.

it automatically assign certain pin.

and you can change your schematic..... if it is not done yet.

you can write ddr logic by yourself.( that is tough stuff )

if your schematic is done, you can find another way to fix the problem.