There are 3 parameters that changed units in the DDR4 IP Memory Timing tab in the Quartus® Prime software version 15.1.
Prior to version 15.1 : The units of tdIVW_dj and tQH are in cycles and tDQSQ is in ps. This required a user to manually modify the parameter value after reading it from a manufacturer\'s data sheet.
In version 15.1 : TdiVW_total, tQH and tDQSQ are all in units of UI (unit interval) which is half the memory clock period. These parameters can now be read directly from the manufacturer data sheet and entered into the parameter GUI.
Note that tdIVW_dj and TdiVW_total may be shown as TdiVW in some manufacturer DDR4 data sheets.