ADLINK DAQe-2006 - Manual (Page 67)

Operation Theory 55
Stop Modes of Scan Update
You can call software stop function to stop waveform genera-
tion when it is still in progress. Three stop modes are provided
for timed waveform generation meant to stop the waveform
generation. You can apply these three modes to stop wave-
form generation no matter infinite or finite waveform generation
mode is selected.
Figure 4-20 illustrates an example for stop mode I, assuming
the data in the data buffer are 2V, 4V, 2V, and 0V. In this
mode, the waveform stops immediately when software com-
mand is asserted.
In stop mode II, after a software stop command is given, the
waveform generation does not stop until a complete single
waveform is finished. See Figure 4-21. Since the UC_counter
is set to four, the total DA update counts (number of pulses of
DAWR signal) must be a multiple of four (update counts = 20 in
this example).
In stop mode III, after a software stop command is given, the
waveform generation does not stop until the performed number
of waveforms is a multiple of the IC_Counter. See Figure 4-22.
Since the IC_Counter is set to three, the total generated wave-
forms must be a multiple of three (waveforms = 6 in this exam-
ple), and the total DA update counts must be a multiple of 12
(UC_counter * IC_Counter). You can compare these three fig-
ures to see the differences.
Figure 4-20: Stop Mode I