There are examples provided for different video formats
each have several programming steps labeled
ADI Recommended Sequence.
They start by setting the 0x80 bit of register 0x0E;
which is given the name HIDI2CEN but not described
anywhere. Followed by programming of
several registers with what seems to be values
inconsistent with those register's descriptions.
Then the HIDI2CEN bit is cleared.
(This may be setting a bank of internal, undocumented
registers to desired values).
Other than following the specific steps for
each video format shown, how are we to guess what sequence
should be used for custom video formats?