ADLINK PXI-2502 - Manual (Page 38)

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• Operation Theoreym
NOTE: The maximum D/A update rate is 1MHz. Therefore the minimum
setting of UI_counter is 40.
(UC _Counter=4, IC_Counter=3)
4 update counts, 3 iterations
DAWR
WFG_in_progress
DA update_interval t=
UI_Counter/Timebase
Operation start
Trigger
Delay until
DLY1_Counter
reaches 0 Delay until
DLY2_Counter
reaches 0
Output Waveform
Delay until
DLY2_Counter
reaches 0
0
2
4
-4
A single waveform
UC_Counter=4
IC_Counter = 3
Figure 4.2.3 Typical D/A timing of waveform generation
(Assuming the data in the data buffer are 2V, 4V, -4V, 0V)
4.2.2.2 Trigger Modes
Post-Trigger Generation
Use post-trigger generation when users want to generate waveform right
after a trigger signal. The number of patterns to be updated after the
trigger signal is specified by UC_counter* IC_counter, as illustrated in
Figure 4.2.4.