ID:15961 datain input of delay chain primitive "<name>" is driven by an inverted output of "<name>". When datain is driven by the following ports, they cannot be inverted: DQS delay chain dqsbusout, DQS enable control dqsenableout, I/O IBUF o, delay chain dataout, DDIO Out dataout, DDIO_OE dataout and output phase alignment output.