// create waveform file
initial begin
   $display("start simulation");
   $dumpfile("wave.vcd");
   $dumpvars(0,displayCoin);
   $dumpvars(0,outputWater);
   $dumpvars(0,f);
   #10000 $finish;
end

initial begin
   $monitor ( $time, " ", CLK, pllclk, onepulseclk );
   $dumpfile ( "tb.vcd" );
   $dumpvars ( 1, CLK, pllclk, onepulseclk );
   CLK = 0;
   #2000;
   $finish;
end

initial begin
   $monitor ( $time, " ", CLK );
   $dumpfile ( "pll.vcd" );
   $dumpvars;
   CLK = 0;
end