Re: [f-cpu] What's wrong here?

[Etienne LABARRE <etienne.labarre@gadz.org>]

On Tue, Jul 30, 2002 at 07:01:10PM +0200, Just an Illusion wrote:
> Hello,
> 
> The variable H and L can't be used to calculate the size of B, more they 
> are unnecessary.
> 
> When you call the function inv_word with a vector, the A'HIGH and the 
> A'LOW aren't referred to the real size of the vecteur, but the part 
> connected.
> 
> The good version is more like :
> 
> function inv_word (A : in std_ulogic_vector) return std_ulogic_vector is
>    variable B : std_ulogic_vector ( A'HIGH downto 0);
> begin
>     for i in 0 to B'HIGH loop
>            B(i)=A(A'HIGH-i);
>     end loop;
> end inv_word;
> 
> or
> 
> function inv_word (A : in std_ulogic_vector) return std_ulogic_vector is
>    variable B : std_ulogic_vector ( A'LENGHT-1 downto 0);
> begin
>     for i in 0 to B'LENGHT-1 loop
>            B(i)=A(A'LENGHT-1-i);
>     end loop;
> end inv_word;
> 
> Or any combinaison of both.
> 

My problem is :
Input vector maybe 0 to length-1, but low index can be not null. And i
want a output vector with same range as input.

And i don't see what's wrong, it's works fine with simili. Is it luke ?

Etienne.
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