ID:179014 Cannot pack DDR register <name> and I/O node <name> -- register fans out to <fanout> destinations.

CAUSE: The specified register is connected to memory interface circuitry in the I/O region of the FPGA and so it must be packed into a dedicated I/O output register, I/O OE register, or I/O OCT register location. The Fitter is unable to pack a register that fans out to more than one destination, and so it is illegal to pack this register into the I/O.

ACTION: Modify your design so that the register does not fanout to more than one destination.