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If you choose RGB888 output format in CX3 MIPI interface configuration, then as you said, for each PCLK 24 bits will be driven from MIPI receiver block to GPIF block of CX3.
In your case, line size is 1280 * 10 bits = 12800 bits. To transfer these bits number of PCLKs needed is 12800 / 24 = 533.333 - which is not integral number. So, with this line size it is not possible to choose 24 bit output from MIPI receiver. You can try 16 bit output instead.
Thanks for your reply, you give me a big help !
As you said, the line size must be 24 bit alignment, then if I set sensor output to 1296 pixels/line, each pixel is still 10 bits.
So line size is 12960 bits, and it can be transferred by RGB888 format. Is it right ?
Yes. You are correct. 24-bit output is possible with 1296 pixels per line.