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 all_known = ^(bus)!==1'bx ; 
assign has_unknown = ~all_known ; 
assign bus_if_known = (all_known) ? bus : 8'd0 ; 
endmodule