20'd0: instruction <= 32'h20110001; // addi    $s1,    $zero,  1
20'd1: instruction <= 32'h00000000;
20'd2: instruction <= 32'h00000000;
20'd3: instruction <= 32'h00000000;
20'd4: instruction <= 32'h00000000;
20'd5: instruction <= 32'h0c000007; //     jal     func
                                    // end:
20'd6: instruction <= 32'h08000006; //     j       end
                                    // func:
20'd7: instruction <= 32'h20120002; //     addi    $s2,    $zero,  2
20'd8: instruction <= 32'h00000000;
20'd9: instruction <= 32'h00000000;
20'd10: instruction <= 32'h00000000;
20'd11: instruction <= 32'h00000000;
20'd12: instruction <= 32'h03e00008; //     jr      $ra