I am somewhat confusted on how to update the different control register in the ADIS16375. For instance, in the Data sheet, page 10 to update the flash the final command is DIN=0x8300. Where does this value come from? Then on page 24 to update the FNCIO_CTRL the final command is DIN=0x8700. Then on the same page, to update the GPIO_CTRL the final command is DIN=0x8900. Where are these values documented? What am I overlooking?