private void PostDelayedClock(int index, Signal outputSignal)
{
TimeSpan p = periods[index];
if(p.Equals(TimeSpan.Zero))
return;
ToggleValue tv = outputSignal.Value as ToggleValue;
if(tv == null)
tv = ToggleValue.InitialToggle;
outputSignal.PostNewValue(tv.Toggle(), p);
}
