Permit_unmatched_virtual_intf

In reply to vonleewolff:
You still have not shown how DW gets the value 12 in the lines:

 tb/demod_tb.sv: adc_dac_interface#(DW) adc_dac_if(clk1, resetn);

or any remaining code where you are using adc_dac_interface#(DW)