Problems working thru "Using Triple-Speed Ethernet on DE2-115 Boards"

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You need to examine your install settings, you may have installed Quartus incorrectly.

And it works just fine with only the tools available/shipped with the board. It also works fine with the web (free) edition of the software. You need to be familiar with Quartus, Qsys (and SOPC builder), how the top level etity ties it all together.... and then you also need to be familiar with eclipse and the EDK-modifications to it -- the BSP and how to download code and later how to generate your hex file for memory initialization so it will run without being tethered.

The learning curve is quite steep for FPGA w/soft core processors...

Keep at it, but start with simpler examples to make sure your tools are installed correctly.

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Ok I'm going back to basics with the My First Nios II tutorial (which I had originally skipped). Can you suggest some other examples or other sources through which I might start learning soft core processors?

Many thanks,

Rajas