lwIP RAW mode support for V4 temac

On May 9, 7:16 pm, Jeff Cunningham <j...@sover.net> wrote:
> Guru wrote:
>
> > Ave Paul! There is a lack of fast and free TCP/IP stacks which work
> > with TEMAC. It would be nice to port your stack to GSRD design
> > (www.xilinx.com/gsrd) to get a maximum speed and royalty free
> > reference design. I got this design working on Avnet Virtex-4FX12
> > MiniModule, which is a low cost high performance OEM module.
> > Unfortunatelly there are no good reference designs which can exploit
> > this performance. If I were a better SW engineer I could help you on
> > development from which both would benefit.
>
> > Guru
>
> Hi Guru,
>
> I am the hardware engineer who is working with Paul. I'd love to hear
> any comments you might have on our approach.
>
> Our application specific IP that must also fit in the FPGA is a PLB
> master DMA device that uses about 50% of the BRAM and 25% of the fabric
> in the FX12. We originally were going to use the FX12 Minimodule, but
> switched to the ML403 to get 2x the DDR bandwidth. We can get by with
> 400 Mb/s performance for now, but would like to get 800 Mb.
>
> It seemed like all the GSRD examples almost filled a FX12, particularly
> with BRAM usage, so we used the EDK supplied PLB TEMAC core and the PLB
> DDR controller for now.
>
> Since our app only needs high speed in the receive direction, it seemed
> like it should be possible to remove half the GSRD logic (i.e. the
> transmit part) and then everything would fit. As someone who has worked
> with the GSRD, do you have a feel for how hard this would be? Or would
> you guess the full GSRD (both directions) could fit with our IP somehow?
> The critical resource seems to be BRAM and it always seemed like the
> xilinx IP really used more BRAM that it should.
>
> thanks,
> Jeff

 Jeff,

My GSRD design uses about 70% of FX12 logic resources and about 60% of
BRAMs. BRAM usage is easy to control since you can set FIFO size from
1BRAM   for a MPMC2 port. The best of MPMC2 is an NPI port which
simplifies the user peripherals with DMA - what I use for image
acquisition. I also tested TEMAC transfer rates to the PC: 730Mbit
1.5k MTU and 850Mbit for 7k MTU.
If you need any additional resources do not hesiste to contact me.

Guru

Hi, I'm trying to transfer a small .bin file of size utmost 1-2MB from PC to sdr ddrram of ML403 using a crossover Ethernet cable (TCP/IP). I'm using PowerPC and plb bus. How do I write a socket program to transfer the file?