FPGA study notes 17 - always waveform generating block

module test2; 

reg clk1,clk2; 

parameter CYCLE = 100; 

always 

   begin 

                    {clk1,clk2} = 2'b10; 

      #(CYCLE/4)  {clk1,clk2} = 2'b01; 

      #(CYCLE/4)  {clk1,clk2} = 2'b11; 

      #(CYCLE/4)  {clk1,clk2} = 2'b00; 

      #(CYCLE/4)  {clk1,clk2} = 2'b10; 

    end 

initial $monitor($time,,,"clk1=%b clk2=%b",clk1,clk2); 

endmodule