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Message
From: Michael Hordijk<hoffbrinkle@h...>
Date: Thu Apr 21 16:46:28 CEST 2005
Subject: [oc] Re: Operations within a vector
"Roberto Ammendola" <roberto.ammendola@r...> wrote in message
news:426684A9.7060303@r......
> David Brochart wrote:
>
> >variable global_b : std_logic;
> >...
> >global_b := '0';
> >for i in PARAMETER downto 0 loop
> > for j in VECTOR_SIZE downto 0 loop
> > global_b := global_b or b(i, j);
> > end loop;
> >end loop;
>
> thanks David, that's cool.
> I just wonder if there is a concurrent way to do it. But I am afraid
> that i am searching for something that (V)HDL can handle only in a
> sequential statement like above. And anyway I don't think my synthetizer
> will encounter many troubles to fit it in the timing requirements...
The above code is "concurrent," as in there is no notion of a clock
anywhere. Wrapping it a function, you can call the function in a concurrent
signal assignment. Putting it process that is sensistive to the appropriate
will make it a concurrent process. Any decent sythesizer should have any
trouble with the for loop. Remember:
a <= b;
is no different than:
process is
begin
a <= b;
wait on b;
end process;
or:
process (b) is
begin
a <= b;
end process;
or any of the other dozens of ways it could be coded up.
- hoffer
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