44. Bus Error Checker

assign an=^bus;
assign all_known = (an === 1'bx)?1'b0:1'b1;
assign has_unknown = (an === 1'bx)?1'b1:1'b0;
assign bus_if_known = (all_known)?bus:8'h00;

module error_checker_xz(input [7:0]bus,output all_known,has_unknown,output [7:0]bus_if_known);
wire an;
assign an=^bus;
assign all_known = (an === 1'bx)?1'b0:1'b1;
assign has_unknown = (an === 1'bx)?1'b1:1'b0;
assign bus_if_known = (all_known)?bus:8'h00;
endmodule