pjrc:
However, I am willing to do one thing. If you have found any documentation that is unclear or ambiguous, which might have suggested to you the possibility of using Ethernet.init(-1), please be specific about where you saw such info. I would very much like to improve the documentation. If it is unclear in any way, I want to make sure nobody ever is given the false impression that Ethernet might support using a negative number for the CS pin.
sorry Paul, I suggested the -1 as dummy CS pin number to correspond to CS pin connected to Ground pin. I didn't know that the Wiznet chip requires FALL change on the CS pin right before data transmition.