- + Issue 825: 10 System tasks and functions

[Ian Wilson, 04 Jan 2001]

  10 System tasks and functions 
  Some changes from previous versions. 
  The $realtime vs. $realtime(N) mess gets cleaned up by introducing $abstime(). 
  There is potential ambiguity with system tasks with the same name in Verilog-D and Verilog-AMS, 
  but with two different definitions ($random, possibly); and with system tasks that modify 
  their argument (for example, some system tasks take and modify a seed value. Does this count 
  as ?assignment? for the purpose of defining the domain of the variable (c.f. 8.2.1)? If so, 
  does this behavior apply to user system tasks also? How can the simulator determine whether 
  a system task argument is read-only or is modified by the task?). 
  
  Verilog-AMS needs table lookup functions for modeling - add $table & variants here.