Quartus：Instantiation of ‘sdram_ model_ plus‘ failed. The design unit was not found.

Problem description

SDRAM When initializing module emulation , Using someone else's module , Compilation is right , The simulation reports an error ：
Instantiation of ‘sdram_model_plus’ failed. The design unit was not found.

Solution

Add files at the same time , And the name is tb Of documents

The file was not found , Just add which file , Just pay attention to a box where the name is used tb File is OK