`timescale 1ns / 100ps

// behavioural model of a digital window comparator

module window(Too_High, OK, Too_Low, Top_Limit, Value, Bottom_Limit);

output Too_High, OK, Too_Low;
input [3:0] Top_Limit, Value, Bottom_Limit;

wire Too_High, OK, Too_Low;
wire [3:0] Top_Limit, Value, Bottom_Limit;

   assign Too_High  =  Value >=  Top_Limit;
   assign  Too_Low  =  Value <=  Bottom_Limit;
   assign       OK  =  !Too_High && !Too_Low;

endmodule