Re: EXTERNAL: Re: [vhdl-200x] Sizing of variables and signals from initial values

On 04/24/2013 03:02 PM, Jones, Andy D wrote:
> Formatting error... example should be:
>
> Variable a, b : ufixed(arg'range) := (others => '0'); -- 0.0
>
> Variable sum : ufixed := a + b; -- also 0.0, but "bigger"
>
> Variable product : ufixed := a * b; -- still 0.0, but even "bigger"
>
Cleaver.  This will work to bound the types.

I admit the helper scripts here are a bit verbose, but I could not think 
of a better way to do it.   The idea here is that none of the operations 
do any rounding, they just let the number grow.   The way I fix this 
issue is like this:

variable a, b : ufixed (arg'range);
variable result : ufixed (arg'range);

result := resize ((a + b) * a, result'high, result'low);


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