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As an add-on to this quetsion, are real numbers always synthesizable or only
certain architectures?


"Jeremy Pyle" <> wrote in message
news:e%HKa.33938$...
> Hey all,
>
> I'm trying to find out how I would get a hold of the representation of a
> real number. I know it's represented at a sign bit, exponent, mantissa,
but
> I'm trying to store this real number in RAM, meaning I have to pass it in
as
> a STD_LOGIC_VECTOR, so somehow I need to convert a real to a
> STD_LOGIC_VECTOR. Is there any way to do this?
>
> Also, I have to divide the real numbers so I'm trying to figure out the
best
> way to do it. Here are my two choices:
> 1. just use the division operator provided for real numbers
> 2. use the XiLinx dividor module provided in XiLinxCoreLib.
>
> If anyone could tell me the pros and cons of using one over the other that
> would be fantastic.
>
> Thanks all,
>
> Jeremy
>
>

In article <0VMKa.34026$>,
Jeremy Pyle <> wrote:
>As an add-on to this quetsion, are real numbers always synthesizable or only
>certain architectures?

Real ALUs take up a lot of space. If you are trying to do an add in one
stroke, you have to have a normalizing array and an adder. This is a lot
of logic so some tools won't even try unless you are designing for a
really big chip.

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