Error: (vsim-3033) Instantiation of 'msgdma' failed. The design unit was not found. - Error: (vsim-3033) Instantiation of 'msgdma' failed. The design unit was not found. I get this error when I try to simulate in ModelSim Altera Starter Edition 10.3c This is my first time simulating a Qsys block in ModelSim. I have successfully completed the following steps: created Qsys block containing 2 MSGDMAs and 1 clock source created ModelSim project and test bench which instantiates Qsys block and a user submodule generated Qsys simulation files and exported them to the ModelSim source directory ran mentor.do according to the generated msim_setup.tcl The generated simulation folder contains a submodule folder with all the .v files for the Qsys IP blocks. When I run " mentor.do ", a Libraries folder shows up in the source directory. When I try to simulate my test bench I get the following error: Error: (vsim-3033) simulation/msgdma_fifo_manager.v(61): Instantiation of 'msgdma_fifo_manager_msgdma_0' failed. The design unit was not found. # # Region: /depth_engine_tb/u0 # Searched libraries: # /sim/top/depth_engine/libraries/work Any help would be appreciated. Replies: Re: Error: (vsim-3033) Instantiation of 'msgdma' failed. The design unit was not found. I am using ModelSim Altera Starter Edition 10.3c. I am also compiling within ModelSim but the Qsys project was created using Quartus Prime Version 17.0.2. As an update, I realized that the way I defined the TOP_LEVEL_NAME in the mentor. do file was incorrect. Which meant it prevented the msim_setup.tcl script from running the simulation. And when I then went and tried to run the simulation manually, I was doing so without the library inclusions that the tcl script uses. vsim -t ps $ELAB_OPTIONS $USER_DEFINED_ELAB_OPTIONS -L work -L work_lib -L write_mstr_internal -L read_mstr_internal -L dispatcher_internal -L rst_controller -L msgdma_0 -L altera_ver -L lpm_ver -L sgate_ver -L altera_mf_ver -L altera_lnsim_ver -L cyclonev_ver -L cyclonev_hssi_ver -L cyclonev_pcie_hip_ver $TOP_LEVEL_NAME Since it was hard to find information online for how to define these variables, the definition that finally worked was set TOP_LEVEL_NAME work.user_module_tb I am now able to simulate. I get warnings that may have to do with the fact that my test bench is still incomplete, but otherwise the MSGDMA is simulating properly. Replies: Re: Error: (vsim-3033) Instantiation of 'msgdma' failed. The design unit was not found. Hi @VCham , Can you share the design ? Which version &edition of quartus & modelsim are you using ? Attache modelsim log. Regards Anand