44. Bus Error Checker

How do you plan to solve it?

/*Write your code here*/
module error_checker_xz(
    input [7:0] bus,
    output all_known,
    output has_unknown,
    output [7:0] bus_if_known
);
    wire [7:0] check_vector;
    wire has_xz;
    assign check_vector = bus ^ bus;
    assign has_xz = (check_vector !== 8'h00);
    assign all_known = (has_xz == 1'b0);
    assign has_unknown = (has_xz == 1'b1);
    assign bus_if_known = has_xz ? 8'h00 : bus;
endmodule