Question about ADF7242


I'm DFAE in Japan. I received a couple of questions about ADF7242 from my customer. The customer uses GFSK SPORT mode and data rate is 2Mbps.

1) Should we use 500ns for I/F clock(tsym) in this case?

2) Should we send the serial data of I/F by MSB first or LSB first?

I checked the datasheet but I couldn't find the information about them.

Best regards,