yes I have tried it @Tim Edwards . I was wondering what is reg_la0_data_in does? while (1) { if (reg_la0_data_in > 0x1F4) { reg_mprj_datal = 0xAB410000; break; }. https://github.com/efabless/caravel_user_project/blob/main/verilog/dv/la_test1/la_test1.c