44. Bus Error Checker

How do you plan to solve it?

module error_checker_xz (bus, all_known, has_unknown, bus_if_known);

input  [7:0] bus;
output all_known;
output has_unknown;
output [7:0] bus_if_known;


wire check = (^(bus ^ bus)) === 1'bx;

assign all_known     = ~check;
assign has_unknown   = check;
assign bus_if_known  = all_known ? bus : 8'b0;

endmodule