[sv-dc] Driver/Receiver methods and a real Z

In a prior post (http://www.eda-stds.org/sv-dc/hm/0096.html) I suggested
explicit declarations for drivers and receivers. An extension of that
methodology is that those objects can have methods, e.g. disconnect,
connect, active, inactive.

So instead of trying to added a 'Z' state to a real driver type you do
something like:

  module foo(wire out...
    driver current iout(out); // current is a real

    initial iout.inactive(); // start disconnected

    always @(powerup) then
       iout.active(); // have power so start driving
       iout = ...;

A resolution function called on an empty array (no active drivers)
should give an appropriate value (e.g. 'Z' for logic).

I'd probably reserve connect/disconnect for later for use with more
dynamic reconfiguration of hardware.

Kev.
 

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