i used the wiznet api as a reference.
the NOINT option will poll the W5xxx chip. When you define an interrupt, the status register is filled in the interrupt. and this status is used by functions to determine the state. but since most functions need a certain state, i wonder how useful this is because these block too. i could not see the benefit but it is some time ago i implemented the wiz chips.
IMO you can best use NOINT, and the use some interrupt pin to flag that the chip status changed. you can then check if you received new data and read it.
to access the various registers there are special commands , there is a sample too that demonstrates setting/reading any register in the chip. the sample just changes the IP number.
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