ID:15944 The dqsupdateen input of DQS delay chain "<name>" may not be driven by an inverted dqsupdate output of a DLL.

CAUSE: The dqsupdateen input of the specified DQS delay chain is driven by an inverted dqsupdate output of a DLL.

ACTION: Change the design so that the dqsupdate output of the DLL is not inverted.