ISAC: comments on Bugzilla VHPI issue 213

Enclosed are comments from John Shields, which he gave me almost a full 
month ago.
No one else from VHPI has  commented on any of the VHPI Bugzilla issues.

Concerning Bugzilla #213:

"Well there is an intent that a port of mode in can be forced and the 
meaning is that the
effective value of the signal connected to the port will be overridden.  
This is not in the sense of the
target of an regular assignment, but the target of the force. You might 
imagine that force is used to override
existing model behavior, a patch or quick fix if you will.   That can be 
used for testbench or debugging
purposes. If you know that a signal's effective value is not what you 
want, you can force it to be what you want.
An input port is a fair reference to the connected signal's effective 
value.

What I don't recall is whether it is only that in port that will be 
affected, or whether it goes to the
effective value on the connected signal.  It may or may not be clearly 
specified either, I just don't know. I
would be a little concerned if it was only the in port because the 
implication is that the availability of force
in the language eliminates port collapsing. "



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