菜鸟求助：modelsim中怎样仿真出系统任务如$monitor、$diplay等

spdcr

下面程序：



module blocking_nonblocking();


   reg a,b,c,d;

// Blocking Assignment

initial begin

    #10  a = 0;

    #11  a = 1;

    #12  a = 0;

    #13  a = 1;

end



initial begin
    #10  b <= 0;

   #11  b <= 1;

   #12  b <= 0;

   #13  b <= 1;
end



initial begin

    c = #10 0;

    c = #11 1;

    c = #12 0;

    c = #13 1;

end



initial begin

    d <=  #10  0;

    d <=  #11  1;

    d <=  #12  0;

    d <=  #13  1;

end



initial begin

   $monitor("TIME = %g A = %b B = %b C = %b D = %",$time,      a, b, c, d);
    #50  $finish;

end



endmodule

怎样操作得到如下输出：
TIME = 0 A = x B = x C = x D = x TIME = 10 A = 0 B = 0 C = 0 D = 0 TIME = 11 A = 0 B = 0 C = 0 D = 1 TIME = 12 A = 0 B = 0 C = 0 D = 0 TIME = 13 A = 0 B = 0 C = 0 D = 1 TIME = 21 A = 1 B = 1 C = 1 D = 1 TIME = 33 A = 0 B = 0 C = 0 D = 1 TIME = 46 A = 1 B = 1 C = 1 D = 1