VID1/SEL
This pin selects SVI or PVI mode operation based on the state
of the pin prior to enabling the ISL6323. If the pin is LO prior to
enable, the ISL6323 is in SVI mode and the dual purpose pins
[VID0/VFIXEN, VID2/SVC, VID3/SVD] use their SVI mode
related functions. If the pin held HI prior to enable, the
ISL6323 is in PVI mode and dual purpose pins use their VIDx
related functions to decode the correct DAC code.