high bandwitch ethernet communication

On Sep 7, 4:06 pm, eliben <eli...@gmail.com> wrote:
> On Sep 7, 8:14 am, glen herrmannsfeldt <g...@ugcs.caltech.edu> wrote:
>
> > Paul Keinanen wrote:
>
> > (snip)
>
> > > If the OP required only something dedicated point to point
> > > connectivity, why bother with the IP wrapper, just send raw Ethernet
> > > frames with MAC addressing ?
>
> > You could, but sending UDP isn't that much harder.  If you really want
> > to simplify it, put the destination MAC address in as a constant
>
> This is exactly why direct MAC communication is undesirable here.
> Tying the sender to the receiver's MAC address as a constant isn't
> good engineering.
>
> > (saves doing ARP, but ARP could also be done in external software
> > and the result written to the FPGA).
>
> Indeed. ARP needs to be done only once in a while anyway, so it can be
> done by a slow software program.
>
> > The next complication is
> > generating the CRC for UDP, but that is optional.  The ethernet
> > CRC has to be generated in either case.
>
> CRC generation in FPGAs is blazing fast, so I don't really see a
> problem here.
>
> Eli

 Hi Eli,

I am build a similar thing: a GLAN high-speed camera based on low-cost
Avnet Virtex4 Mini-Module. I modified Xilinx GSRD2 to fit on this
module. Sending pure ethernet frames you can achieve 730-850 MBit/s.
The LL_TEMAC is DMA based peripheral with hardware checksum. If you
need any other information or the complete desing do not hesitate to
contact me.

Chers,

Guru