Chapter 4
Arb Operation
©
National Instruments Corporation
4-17
DAQArb 5411 User Manual
Note:
The marker is generated for eight update clocks and the placement
resolution of the marker is ±4 samples.
If you want a marker at an offset of zero from the start of the waveform
buffer, the marker will be eight samples long beginning with the first
sample. A marker at an offset of seven from the start of the waveform
buffer also will be eight samples long beginning with the first sample,
as shown in Table 4-1. A marker at an offset of eight will be generated
at positions 8–15.
Figure 4-16 shows an analog waveform being generated at one
connector and a marker being generated at another I/O connector.
Point A shows a marker generated for requested positions 0–7, and
point B shows requested positions of 8–15.
Figure 4-16.
Markers as Trigger Outputs
Table 4-1.
Generated Marker Positions
Sample
Number
Marker
Requested
Marker
Generated
1
At sample 0 from the beginning of the buffer
Sample position 0–7
2
At sample 1 from the beginning of the buffer
Sample position 0–7
3
At sample 7 from the beginning of the buffer
Sample position 0–7
4
At sample 8 from the beginning of the buffer
Sample position 8–15
5
At sample 255 from the beginning of the buffer
Sample position 248–255
ARB Output
Marker Output
A
B
t
m
