Hello
I think I found the problem. I mismatched inputs with outputs. This means that MyMux has inputs while I was trying to connect those signals with the INPUT signal islv_adc_data.
Now I changed the PMOD_J4 and PMOD_J5 to bidirectional signals. Unfortunately I get this error message when compiling:
Error (13076): The pin "PMOD_J4[1]" has multiple drivers due to the non-tri-state driver "clk"
PMOD_J4[1] is connected to the signal osl_adc_clk which is an output. How can I avoid this problem?