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DS90UB953-Q1: dual camera sync

Part Number: DS90UB953-Q1

HI,

I build a system (OV2775 + 953)X2 + 964, I want to sync two cameras using 964 FSYNC function.

On current HW, 964  GPIO0  output FSYNC 15fps, 953 GPIO3 is connected to sensor FSIN pin but I can not get fsync singal on senosor side even I already enable sensor frame sync function.

I want to know which 964 or 953 registers are needed  to transfer FSYNC signal from 964 GPIO0 to 953 GPIO3?

Thanks!