How to clock the Cyclone 10GX Transceiver Channel for 10GBASE-R

Hi, In “Intel® Cyclone® 10 GX Transceiver PHY User Guide” at page 100, Fig.44, the tx_clkout is 322.265625 Mhz when select PMA bus width of 32 bits (in picture, it says a number for 40 bit wide bus...