we are developing a TX/RX system based on DS90UB933 and DS90UB934 and using ONSEMI (ex Aptina) CMOS sensors like AR0134. The sensor works with an output clock of 48MHz.
In continous mode, when the output clock is always drived on the sensor output, the system works weel. The frames are correctly transfered on the other side and captured.
When we move to triggered mode and send a trigger to sensor every "X"ms, the clock is not alwayd drived on the output of the sensor. Usally, there are some "blank" lines (about 10) out of the sensor before the frame valid, so there is a huge number of pixel clocks before the frame starts. What we facing is that the receiver fails to receive correctly the frame. Monitoring the LOCK or PASS pin shows a strange behaviour, like the receiver tries to syntonize with the clock but fails in the middle of the frame. Another thing is that the PASS goes high a lot of line valid AFTER the frame valid and goes low with the last line (stop of the clock). It means that the receiver takes a lot of time to syncronize. A tipical line is about 1280pixels so is quite long.
What can we do for working in triggered mode with this devices?