Subject: Re: [vhdl-200x] Minutes for VHDL-200X-FT meeting, San Jose Dec 4, 2003
From: Marcus Harnisch (email@example.com)
Date: Tue Dec 09 2003 - 15:04:27 PST
[not a DASC member]
I did not participate in the meeting, so my knowledge about the items
is limited to the slides. Anyway, here are some comments:
- Arrays of Unconstrained Arrays
I agree with Ben, that the declaration should be the same as for
other array types.
- Context Clause Design Unit
Inheritance, anyone? We might want to propagate project settings
down to lower levels. Something to think about. Let the compiler
figure how much we screwed up ;-)
Please. Just don't use the shorter names.
- Signal Spy
I like the alternative using aliases. Whether ':' (colon) is the
best option for a path separator is arguable. Are not most
simulators using either '.' (dot) or '/' (slash)? Why another one?
- Make conditional signal assignment a ternary operator
Why not for variables as well? Did I miss anything?
- Read Output Ports
Can we keep that restricted to non-synthesis? If we get native
signal spy features into VHDL, why not use that instead?
- Boolean Equivalence
Please don't. Implicitly assuming a boolean value leads to
confusion. We should not trade the type-safe nature of VHDL for
(debatable) convenience. Is it really so much better to type "if
(<signal>)", than "if (<signal> = '1')"? How about the less-obvious
case "if (resetn)"? Should that read as "resetn = '1'" or "resetn is
active (low)". VHDL would have to assume the former, while users
browsing the sources would be tempted reading the latter statement
into the code.
Short function names, reading of output ports and boolean equivalence
are not something I spend my day on wishing I had them. Code
completion (e.g. Emacs VHDL mode) helps mitigating a lot of the
"inconveniences" VHDL users have to face. I see that some proposals
would help gaining acceptance among users of The Other HDL, but that
shouldn't be driving us.
-- Marcus Harnisch | Mint Technology, a division of LSI Logic firstname.lastname@example.org | 200 West Street, Waltham, MA 02431 Tel: +1-781-768-0772 | http://www.lsilogic.com
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