DS90UB948-Q1: what does the MAP_SEL of 948 MODE_SEL0 mean and how to choose 0 and 1.

Hale,

Please see section 7.4.3 OpenLDI Output Frame and Color Bit Mapping Select 

The MAPSEL setting sets the order of the bits in the LVDS output and should be based on the expected ordering from the display panel datasheet 

Best Regards,

Casey