44. Bus Error Checker

How do you plan to solve it?

/*Write your code here*/
module error_checker_xz(input[7:0] bus,output all_known,has_unknown,output[7:0] bus_if_known);
wire w;
assign w= (^bus ===1'bx);
assign all_known=(w)?1'b0:1'b1;
assign has_unknown=(w)?1'b1:1'b0;
assign bus_if_known[7:0]=(w)?8'd0:(bus[7:0]);

endmodule