"I think you miss the data bus width that the RGB666 (18 bit) frame will transfer to"
Not sure what you mean with "the data bus width that the frame will transfer to". The camera has 18 data lines. 6 bits are used for each color (R, G and B). So the data bus is 18 bits wide.
"Moreover, you don't mention the format to store an RGB666 (18 bit) frame, does it use 4 bytes or 3 bytes?"
The format is RGB666, 6 bits per color. The image sensor transfers pixels in a single cycle (so 18 bits are transferred on every clock edge). How this data is stored in memory is determined by how the image sensor data lines are connected to the CSI inputs of the i.MX and the configuration of the i.MX. Whether that is in 3 bytes or 4 bytes with bit stuffing depends purely on the configuration of the i.MX no?
Perhaps my main question was not clear enough and I need to clarify. Referring to the following table from the reference manual, you can see that some bits in the RGB666 configuration are assigned to multiple CSI data lines. The main question is: how do I configure what lines are used for a particular bit. For example, DATA[14] and DATA[15] are assigned to G[4] and G[5] respectively. However, DATA[8] and DATA[9] are also assigned to G[4] and G[5]. How do I select what DATA line is used for G[4] and G[5]?
Because some of the CSI pins also overlap with the pins used for the LCDIF when configured in RGB666 mode, I cannot use DATA[14] and DATA[15] and would need to use DATA[8] and DATA[9] instead.
