You may see an error similar to the one shown below when compiling the DDR4 IP in the Intel® Quartus® Prime software versions 18.0 and 18.0.1.
Internal Error: Programmable pre-emphasis option is set to 1 for pin <signal_name>~pad, but setting is not supported by I/O standard SSTL-12 with Slew Rate 0
The <signal_name> is one of the DDR4 address/command signals.