I see several motion triggered FIFO data capture facilities. Can the IMU be configured to perform FIFO data capture based on an external interrupt?Is it possible to have an external interupt trigger data capture in the FIFO
You are referring to the header of the fifo frame reflects the state of the Interrupt pins as of the moment the frame is begun? So the interrupt doesn't trigger the fifo capture. There really isn't any triggering - it is more like the interrupts are sampled once a frame?
Since the gyro needs to be in continous oscillation for measurement, and that it takes up to 80ms to spin-up, triggered MEMS gyroscope measurements are not really possible.
Your are correct that the status of the Interrupt pin can be sampled synchronous with the data sampling. See 188.8.131.52 FIFO synchronization with external events