Hi vikenzhou
1. image length, width can be programmed with register CSI_CSIIMAG_PARA,
described in sect.19.7.13 CSI Image Parameter Register (CSI_CSIIMAG_PARA)
Reference Manual
2. in rev.1 Reference Manual there is no Data_EN :
i.MX 6ULL Applications Processor Reference Manual
3. per description in sect.19.4.3 Non-Gated Clock Mode
"The PIXCLK signal is inactive (states low)
until valid data is ready to be transmitted over the bus."
Best regards
igor