ID:15882 Output port <name> of DDIO_OUT primitive "<name>" driving a FF primitive must eventually drive an I/O OBUF primitive or a DQS_ENABLE primitive.

CAUSE: The specified DDIO_OUT atom is not connected properly. It's driving a FF primitive but not eventually driving an I/O OBUF or a DQS_ENABLE primitive.

ACTION: Check your design to make sure the DDIO_OUT atom is properly connected.