One clocking can be specified as the default for all cycle delay operations within a given module, interface, or program. Only one default clocking can be specified in a program, module, or interface.

Any ## statment will be executed with respect to default clocking.

  1 module clocking_default();
  2 
  3 logic        clk = 0;
  4 always  #10  clk++;
  5 
  6 // Specify the default clocking
  7 default clocking test @ (posedge clk);
  8 
  9 endclocking
 10 
 11 initial begin
 12   $display("%0dns is current time",$time);
 13   // Any ## is evaluated with respect to default clock
 14    ##100 ;
 15   $display("%0dns is current time",$time);
 16   $finish;
 17 end
 18 
 19 endmodule

 0ns is current time
 1990ns is current time

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