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I'm not sure we are talking about the same thing, but doing this is quite easy on any MCU if you use a module as asa1365 said.
I have wired a Wiznet module to a MSP430 and it works without any problem. All you have to do is wire the SPI port and that's
about it. All the rest is software, you have to implement a DHCP if you want it to autoconnect, and then it's quite easy to establish
a TCP connection.
Well, when I say easy, I don't mean that you can do that in half an hour while watching videoclips on youtube, but if you spend
1 or 2 days on it, it can work fine.
He was asking for a _module_ to be connected to his board. Of course it depends what he wants to do with it
(not specified), but it he just wants to have _some_ ethernet connectivity, then a wiznet chip is an interesting solution
which saves you time and headaches. Now if he want so transmit real-time video, that's another story.