[ADV7282-M] Could you tell me the function about "42 5F A8 ; SHA gain for Div4"?

Hello.

I have a question about ADV7282-M.
There is a following description on the script file as follows:

42 5F A8 ; SHA gain for Div4

But there is no description about this register on the H/W manual.
Could you tell me the function about this register?

Thank you.
Best regards.