ID:15874 Output port <name> of DDIO_OUT primitive "<name>" must drive input port <name> of I/O OBUF primitive or input port <name> of DELAY_CHAIN primitive.

CAUSE: The specified DDIO_OUT atom is not connected properly. It should drive the specified port of an I/O OBUF primitive or a DELAY CHAIN primitive.

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