in our design, DS90UB913Q & 914 are set in passthrough mode, my program set 914's slave1 & alias slave id to camera's ID address. PCLK is 12MHz
1)when debug the program, I found that I2C communication is not stable. sometime reading result is OK, sometimes is not as we expected.
I check the signal of SCL between 913 chips and camera module , the waveform is as following picture, looks like SCL signal cannot go to close to "0", SDA signal has the similar problem.
2) I compared the signals on camera side and 914 side, VSYNC on both side looks same and has 8us delay, HSYNC singal looks also ok, I can also see PCLK signal on 914 side without problem, but when I compare the pixel data signal D7 on both side, there are lot of difference between them, not only delay. but 914's "lock" and "pass" signal are quite stable, I do not know why two sides data signal are different.
thanks for help