adf 7023 - crc

Hi to all.

I'm trying a demoboard with adf7023.

I like "programmable crc" option.

Is there anyone that could explain to me what poly I have to use to obtain crc- xmodem ? (poly 0x1021, init 0x0000, reflected input FALSE, reflect output FALSE, xor output 0000, crc of "0x31 0x32 0x33 0x34 0x35 0x36 0x37 0x38 0x39" -ascii "123456789"- 31c3)

Thank you.