In Quartus® II software versions 9.1, 9.1 SP1 and SP2, there is an issue in the file <variation_name>_memphy_top.v that occurs when generating a full rate UniPHY QDRII interface with the "Master for PLL/DLL sharing" option not selected.
The workaround is to make these changes. and then recompile.
1. In the file <variation_name>_memphy_top.v comment out this line.
assign pll_mem_clk = pll_afi_clk;
2. In file <variation_name>_example_top.v where the instantiation is
<variation_name> mem_if (
change this line to
Recompile the project.
If you re-generate the IP, remember to repeat these changes. This issue is expected to be fixed in a later version of Quartus II software.