[f-cpu] Re: genereic_adder patch

[Michael Riepe <michael@stud.uni-hannover.de>]

On Sun, Sep 16, 2001 at 01:43:56AM +0200, Yann Guidon wrote:

> Here is a tiny modification to Michael's generic adder package.
> The newest version of simili doesn't like the way the agregate
> was used, but it is not too difficult to work around it.

Yep... I had to do this several times, too.

> Concerning the different way to initialize the signals
> with random, i search an elegant and cheap way to bypass
> the limitation imposed by Vanilla.
> 
> As written before, Simili accepts this :
>   Signal s : std_ulogic_vector(N downto M) := random(s);

You mean, you use `s' before the definition is finished?
That looks broken, somehow.

> But i am forced to write this if i want to use Vanilla :
>   Subtype t is std_ulogic_vector(N downto M);
>   Signal  s is t := random(t'(others=>'0'));

Try to overload random, like this:

	function random (bits : natural) return std_ulogic_vector is
		constant tmp : std_ulogic_vector(bits-1 downto 0) := (others => '0');
	begin
		return random(tmp);	-- this is the original function
	end random;

and then write

	signal s : std_ulogic_vector(N downto M) := random(N-M+1);

or maybe

	signal s : std_ulogic_vector(N downto M) := random(s'length);

if the tools grok it.

-- 
 Michael "Tired" Riepe <Michael.Riepe@stud.uni-hannover.de>
 "All I wanna do is have a little fun before I die"
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