ID:15881 Output port <name> of DDIO_OUT primitive "<name>" must drive an I/O OBUF with no more than <number> delay chain primitives in between.

CAUSE: The specified DDIO_OE atom is not connected properly. It should drive an I/O OBUF primitive with no more than the given number of delay chain primitives in between.

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