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Is there documentation that explains how to interface to the sync pin on the Camera Link board?

There is a header connection point on the Camera Link expansion board which provides access to the XP13 pin (External Sync) (pin 21 Hirose). The connection point is through-hole #3 on the PCB (no connector). Hole #1 is the square hole. This is a direct connection to the FPGA, so the input levels should be 0V to 3.3V.