ADLINK Technology USB-1901, User Manual

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46 Operation
nals occurring before the first two scans are completed will be
ignored). When the re-trigger signal occurs, two more scans are
performed. The process repeats until the specified number of
re-trigger signals are detected. The total acquired data length =
NumChan_counter * PSC_counter * Retrig_no.
Figure 4-9: Post Trigger or Delay Trigger with Retriggering
4.4.4 Gated Trigger
Gated-trigger acquisition is indicated in applications where you
want to collect data when trigger events are set to level high/low,
and hold acquisition when trigger events are set to the opposite
level.
The total number of scans for each channel is specified in the
PSC_counter. As shown, after the operation starts, the first scan of
data is immediately acquired when the trigger signal is deasserted
and paused at the second scan when the trigger signal is
asserted.
The four remaining scans are not performed until the trigger signal
is deasserted again. The process repeats until the specified
amount of retrigger signals is detected.
UC_Counter = 3
3 update counts and 2 iterations
UC_count = 3, IC_count = 2, Trig_count = 3, DLY1_count disabled, DLY2_count
disabled
Trigger
DAWR
WF_in_Prog
Wave
Ignored
Single waveform