about ADV7619 4k 2k script config

Hello analog Engineers:

I am use ADV7619 as HDMI receiver,I config the ADV7619 chip with the script ADV7619-VER.1.4c.txt.

If I config it as 1080p and input video 1080p video it seems work well.but if if config it as 4k 2k and we can not see the output.(I watch the output enable pin with Oscilloscope,and the pin always high)

I notice that the different with the 1080p and 4k&2k script just as follow:(config only by 4k&2k script)

 4C C3 80 ; ADI Recommended Settings (HiFreq)

 4C CF 03 ; ADI Recommended Settings (HiFreq)

 98 DD A0; LLC Half Frequency

This three registers's information can not be found in the UG-237.

If i change up register set as follows ,the output enable seems correct.

 4C C3 08 ; ADI Recommended Settings (HiFreq)

 4C CF 03 ; ADI Recommended Settings (HiFreq)

 98 DD A0; LLC Half Frequency

Why is so ?Where can found registers infomation.

the picture is the correct output enable