From: Jan Decaluwe <jan@...>
Date: 2003-03-31T20:13:53+09:00
Subject: Re: Announce: RHDL-0.4.2 (Ruby HDL) an agile HDL

Craig Selton wrote:
> 
> This looks interesting.  You've managed to make a standard scripting
> language look convincingly like an HDL.  I've seen some other similar
> efforts recently (like one that uses Python) but, while interesting,
> they don't end up looking like an HDL - in most cases they end up
> forcing the HDL designer to learn a totally different style.

At least for MyHDL (my Python HDL attempt that you refer to), this
should
not be the case. Just substitute "while 1" for "process" or "always",
and "yield" for "wait", and you're done :-) Also, see the section
on RTL modeling in the MyHDL manual.

Moreover, I believe emphasis on superficial syntax similarities can
make things confusing, as the semantics may still be different.
For example, the very first "process" example in the RHDL manual has
a global sensitivity list *and* an internal wait statement, something
which is forbidden in VHDL. It's forbidden for good reasons I believe,
because if I try to imagine how this is supposed to work, I get
thoroughly confused .. 

Regards, Jan

--
Jan Decaluwe - Resources bvba
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mailto:jan@jandecaluwe.com
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