$utConnectivity

  This system task will create a dump file which Undertow uses to
provide connectivity tracing capabilities. It can be invoked as follows:

initial $utConnectivity;

  So that it will be run only once and at time zero.
  A good place to put this statement is in your top level module.

$utLimitVCD

  This system task will limit a VCD file. You pass an argument to the
routine indicating how many mega-bytes of storage to limit the VCD
file. This routine will setup a circular buffer to limit the VCD file.
This means that you will end up with a VCD file containing signal information
for the last activity in the circuit. The amount of simulation time which
is saved is dependent on the size passed to the system task. The size
does not include the VCD header file. For example if your header file is
three mega-bytes long and you invoke $utLimitDump as follows:

  initial $utLimitVCD(3);

  So that it will be run only once and at time zero.
  A good place to put this statement is in your top level module.

then your VCD file can be as large as six mega-bytes (three for the header
and up to three for the signal states).


