Subject: Re: [vhdl-200x] Transmission gate mechanism and new parameter mechanism wanted
From: Paul J. Menchini (mench@mench.com)
Date: Fri Mar 21 2003 - 06:32:49 PST
Erich and all,
> | > 2) Upward propagation of values during elaboration.
> ...
> | This is a new request. Can I ask you to fill out an IR at ...
> In fact, it is a very old request. This was proposed in 1987-88.
> There was quite a bit of discussion about it during the original
> standardization effort, as I recall. Might be good to review that
> discussion again to see why it wasn't adopted then, and whether the
> reasons still apply. (I've got my notes around here somewhere ... )
Erich is right. IIRC, one of the major problems is that causal loops
can be created. Even if such loops are not created, the evaluation of
generics becomes NP in the general case.
Of course, such concerns are not reasons to reject this request out of
hand....
Paul
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