44. Bus Error Checker

How do you plan to solve it?

module error_checker_xz(
    input [7:0] bus,
    output all_known, has_unknown,
    output [7:0] bus_if_known
);
    wire check;
    assign check = ^bus;
    assign has_unknown = (check === 1'bx);
    assign all_known = ~ has_unknown;
    assign bus_if_known = all_known ? bus : 8'h00;
endmodule