44. Bus Error Checker

How do you plan to solve it?

/*Write your code here*/
module error_checker_xz(bus,all_known,has_unknown,bus_if_known);
input [7:0] bus;
output all_known,has_unknown;
output [7:0] bus_if_known;
wire chk;
assign chk=^bus;
assign all_known=(chk===1'b1||chk===1'b0)?1'b1:1'b0;
assign has_unknown=~all_known ;
assign bus_if_known=(all_known==1'b1)?bus:8'b00000000;
endmodule