Ethernet Communication with Stratix II EP2S30

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originally posted by lord_redbeard@Mar 13 2006, 09:24 AM

hello,

i have to realise an interface between a camera and a computer for image processing, and the data need to be transmitted via an altera stratix ii ep2s30 card.

i made all the researches i could to find an answer to my question, without a real result.

how can i reach a 68mbs transmission rate with my smsc lan91c111 chip ? (i didn't find a free ip which could do this !!!).

if someone have any experience about ethernet communication between an altera card and a computer, please feel free to tell me !

thanks you for your attention,

regards,

lord redbeard.

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Do a search for LAN91C111, there&#39;s several threads about how to increase transmission speeds. I think a user named revolt had the best results. I haven&#39;t done the work myself because transmission speed isn&#39;t an issue but I remember seeing a lot of discussion about it.

The biggest speedup would likely be using DMA with the onboard chip. The default (meaning, how the included driver does it) method of sending a packet to the chip is a loop that sends it 32 bits at a time. Very CPU intensive.

Yep thanks.

I have done some search for my TCP interface and then reduced my needed output data rate to 9 Mbits/s for TCP.

It is said that i must use DMA to stronlgy improve my data rate (and HW checksum too); data rate is basically evaluated to 450 kbits/s in TCP Tx by Altera without optimisations.

To be continued...