44. Bus Error Checker

How do you plan to solve it?

/*Write your code here*/
module error_checker_xz(
    input wire [7:0]bus,
    output wire all_known,
    output wire has_unknown ,
    output wire [7:0]bus_if_known
);

assign has_unknown = ((^(bus ^ bus)) === 1'bx);
assign all_known   = ~has_unknown;

assign bus_if_known = all_known ? bus : 8'h00;
endmodule