public void RFS(){
        ComputeEffectiveAddress();
        getRF().set("00"); //select Register 0 by seting Register File
        SelectRegister().set(getADDR().get()); // R0 <- Immed
        pause(MIDDLE);
        getRF().set("11"); //select Register 3 by seting Register File
        getPC().set(SelectRegister().get()); // PC <- c(R3)
               
    }