[Open-graphics] linuxfr comment (was: OGD1: Everything's ready for us to take pre-orders NOW!)

[Timothy Normand Miller]

On 5/21/08, André Pouliot <andre.pouliot at gmail.com> wrote:
> I'll try to do a summary between the 2 chip. Fist of all, the logic cell
> value is a marketing number who should never be used.
>  The V5SX50T is a chip containing 288 dsp block who are 25*18 multiplier
> with an adder and a accumulator as I understand it. There is 32640 LUT in
> the V5 but those LUT are 6 input and not the 4 found in the previous fpga
> generation. And it have 132 block ram of 36 kbites.
>
>  The S3-4000 is a chip with 96 multiplier 18*18 and also 96 block ram of 18
> kbites. Also the chip contain 55312 LUT, the LUT are 4 entry.
>  So for the comparaison both chip are about equivalent in the logic area.
> The spartan3 have more LUT but they are smaller the v5 have less but they
> are bigger. But being bigger doesn't mean you will use less of them, because
> depending of the logic the LUT is not always fully used. So for the LUT side
> of thing I could call it even. For the dsp/multiplier or the ram the V5 is
> the winner there is more of them and you don't have the exclusivity problem
> found in Spartan3. For the speed probably the spartan3 logic is going to run
> around 100MHz the V5 could probably get to 200Mhz. Also the spartan3 as more
> IO available 630 against 480 for the V5.
>
>  The remaining question is the price for each part. I would be ready to bet
> that the spartan3 is cheaper. Also the fact that we have a board already
> designed and tested for the spartan3.

Ok.  So the 4000 isn't as hot as the V5.  We also need to account for
the RAM and other components on the board.

-- 
Timothy Normand Miller
http://www.cse.ohio-state.edu/~millerti
Open Graphics Project