@item @code{fsm_cmd} @tab 1: ACQ_START (start acquisition, only when FSM is idle)@*2: ACQ_STOP (stop acquisition, anytime)
@item @code{test_data_en} @tab Write the address counter value instead of ADC data to DDR
@item @code{test_data_en} @tab Write the DDR RAM address counter value instead of ADC data to DDR.@*Note that no timetags are appended at the end of test data.
@item @code{trig_led} @tab Manual control of the front panel TRIG LED
@item @code{acq_led} @tab Manual control of the front panel ACQ LED