Andreas, Why do you need pulse _before_ trigger? With this senor exposure of the first line start 8 scan lines after the trigger, last line exposure starts 1/15 sec later. So if you want to use a flash, you need to set the exposure time >1/15 sec and trigger flash 1/15 after the trigger. The FPGA has delay timer, when the camera is triggered externally, this programmable delay is between the arrival of the sync pulse and the sensor triggering. When the camera is set to trigger directly from the FPGA (trigger condition =0), the delay sensor is triggered immediately, and the output sync is delayed by the programmed value - you may use it for the flash. Unfortunately it is for a single camera only. If you still need pulse before the sensor trigger - you may just reverse the trigger source - use external pulse, apply it to multiple cameras in parallel - each camera can be individually delayed by programming TRIG_DELAY parameter.
Andrey
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