Sending and receiving packets

Sending and receiving packets

Postby stephen » Thu Oct 09, 2003 1:59 am

I'm curious about a couple of aspects of this project. Is the output from a couple of fpga pins enough to send data over ethernet?

For receiving packets, I'm wondering how safe it is to send the input to the fpga? Am I likely to see a lot of spikes and the like on a typical ethernetwork? I'm doing a project at school that I'd like to use ethernet for I/O, but my professor won't let me do anything likely to blow one of the (8) boards we have, and after having spent about $200 (canadian) on my setup, I have the same fear at home.
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Postby fpga4fun » Fri Oct 10, 2003 12:00 pm

yes, the outputs of the FPGA are able to send data. Usually it is done through an isolation transformer, but I tried without and had no problem.

There is not a "lot of spikes" on the network. Anyway the IOs should be protected, since they are exposed to the outside. My guess is that a series resistor plus a zener diode should do the trick.
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Ethernet connection

Postby csavery » Mon May 24, 2004 4:36 am


The ethernet i/o is only electrically connected to your own local hub/switch or pc directly so it should not have to deal with anything too weird outside this small domain. I think this is right anyway. I'm sure any "spikes" that were out there would not make it through the hub/switch...

But I'm very curious about the signal standard so I guess I should go read the IEEE stuff about that.

Chris :)
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Postby geekything » Mon May 24, 2004 10:54 pm

You can always 'steal' Ethernet magnetics from an old Ethernet NIC, too ;-)

(New life for those old ISA 10baseT NICs in your closet).

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