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Altera_Forum
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21 years ago

Lan91c111 daughtercard support for NiosII

I am looking at modifying the NiosII ethernet examples to support the reduced pin configuration (only 24pins vs 72) of the Lan91C111 daughtercard that altera seems to have abandoned. QuartusII4.1 su...
Altera_Forum's avatar
Altera_Forum
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21 years ago

Aside from the PDF document mentioned above, is there an actual schematic for this card?

Nate, how did you make the pin assignments for your modified code? I am following the daughtercard docs for a 32bit CPU and I see you have reduced the address bus to [3..0] so I cannot use A2,A3,A4 as described. I believe your code requires the use of a byte enable as well.

I went ahead and use A1,A2,A3 (16bit cpu config) and most of the code does execute OK. The telnet example I am trying doen't crash, but I do see some incorrect accesses. It looks like all short accesses are converted to two byte accesses. I see accesses to odd offsets which I don't think will write correctly without the byte enable. Anyway, let me know what your test configuration was.

thanks,