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 has_xz = ^bus === 1'bx; // this does not check for z only x
  //wire any_xz = (^(bus ^ bus)) === 1'bx; from solution checks for z and x
  assign all_known = has_xz ? 0 : 1;
  assign has_unknown = has_xz ? 1 : 0;
  assign bus_if_known = has_xz ? 8'h00 : bus;
  
endmodule