Hello Christian,
I'm afraid that if I mentioned previously that mode 3 was possible, that was a mistake. Actually, if you look at the datasheet, the timing diagrams for SPI clearly show that the device operates in mode 0. (CPOL = 0 and CPHA = 0)
I did a quick test using the evaluation board and the included USBi communication interface board. You can see from this photo that my successful communication was in mode 0.
Sorry for the confusion.