lfsr_updown_tb.v

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`define WIDTH 8
module lfsr_updown_tb();
 reg clk;
 reg reset;
 reg enable;
 reg up_down;
 
 wire [`WIDTH-1:0]count;
 wire overflow;
 
 initial begin
    $monitor("rst%b en%b updown%b cnt%b overflow%b",reset,enable,up_down,count,overflow);
    clk=0;
    enable=0;
    up_down=0;
    #10 reset=0;
    #1 enable=1;
    #20up_down=1;
    #30 $finish;
 end
 always #1 clk=~clk;
 
 lfsr_updown U(
 .clk       (clk     ),
 .reset     (reset   ), 
 .enable    (enable  ),
 .up_down   (up_down ),
 .count     (count   ),
 .overflow  (overflow)
 );
 
 endmodule