Beginner question about slice and LUT

Hello everybody,
where can I find a clear explanation of the difference between

Number of Slice Flip Flops

and

Number of 4 input LUT

in the feedback provided by ISE Xilinx.
I'm a bit confused.
Any explanation or link will be very helpful
Gio

Giox

On 22 fev, 13:34, "Giox" <giovanniparod...@yahoo.it> wrote:
> Hello everybody,
> where can I find a clear explanation of the difference between
>
> Number of Slice Flip Flops
>
> and
>
> Number of 4 input LUT
>
> in the feedback provided by ISE Xilinx.
> I'm a bit confused.
> Any explanation or link will be very helpful
> Gio

I guess that relation can be different for each FPGA (Xilinx: Spartan,
Virtex 2, Virtex 4 etc) so a good place to find this information would
be the user guide of your target board.
Cheers,
weber

> where can I find a clear explanation of the difference between

Look in the datasheet for the device (Spartan3, virtex4, ...etc) you
are using.
i.e http://www.xilinx.com/xlnx/xweb/xil_...y=Publications

"Giox" <> writes:

> Hello everybody,
> where can I find a clear explanation of the difference between
>

The difference between them is that they are a count of completely
different things...

> Number of Slice Flip Flops
>

The is the number of flipflops used up by your design, that have been
put into the slices. Flipflops in IO blocks don't count towards this number

> and
>
> Number of 4 input LUT
>

This is the number of LUTs used up by your design. These are also in
the slices.

> in the feedback provided by ISE Xilinx.
> I'm a bit confused.

What by? I wonder if you are making things more complicated than they
actually are?

> Any explanation or link will be very helpful
> Gio
>

I'm happy to explain more if desired

Cheers,
Martin

--

TRW Conekt - Consultancy in Engineering, Knowledge and Technology
http://www.conekt.net/electronics.html

Thanks a lot for your help.
You solved my doubts.
Giox

On 23 Feb, 15:33, Martin Thompson <martin.j.thomp...@trw.com> wrote:
> "Giox" <giovanniparod...@yahoo.it> writes:
> > Hello everybody,
> > where can I find a clear explanation of the difference between
>
> The difference between them is that they are a count of completely
> different things...
>
> > Number of Slice Flip Flops
>
> The is the number of flipflops used up by your design, that have been
> put into the slices. Flipflops in IO blocks don't count towards this number
>
> > and
>
> > Number of 4 input LUT
>
> This is the number of LUTs used up by your design. These are also in
> the slices.
>
> > in the feedback provided by ISE Xilinx.
> > I'm a bit confused.
>
> What by? I wonder if you are making things more complicated than they
> actually are?
>
> > Any explanation or link will be very helpful
> > Gio
>
> I'm happy to explain more if desired
>
> Cheers,
> Martin
>
> --
> martin.j.thomp...@trw.com
> TRW Conekt - Consultancy in Engineering, Knowledge and Technologyhttp://www.conekt.net/electronics.html

"Giox" <> writes:

> Thanks a lot for your help.
> You solved my doubts.
> Giox

You're welcome!

Cheers,
Martin

--

TRW Conekt - Consultancy in Engineering, Knowledge and Technology
http://www.conekt.net/electronics.html