In looking through the data sheet I just felt something was missing and while contemplating the data stored on the EEPROM I noticed that chapters 5 and 6 are missing from the datasheet available from the Manufacturer :(

All the good stuff is missing....

Ok The Data sheet on CMedia website is missing the good stuff but the one here https://www.alldatasheet.com/datasheet-pdf/pdf/1037317/CMEDIA/CM6400X1.html

has it all