Chapter 2
NI 5450 Overview
©
National Instruments Corporation
2-85
NI PXIe-5450 User Manual
The following figure shows the exported data marker event shifting
between low and high as the specified data bit toggles.
NI-FGEN compensates for the factors that affect the delays in the digital
and analog paths in assuring that the Data Marker event appears within one
Sample clock of the waveform output.
Data Markers as Trigger Outputs
A delay of at least 44 Sample clocks exists between the Start trigger and
when the analog waveform generation appears on the output connector.
Therefore, synchronizing the signal generator output signal to other devices
with fast trigger response times is accomplished using the data marker
event from the signal generator as the trigger source for the other device for
more precise alignment to the generating waveform. You can do this using
the RTSI bus, PXI trigger lines, SYNC OUT/PFI 0 and PFI 1 or PFI 4 and
PFI 5.
Note
Devices without a DDC connector do not support PFI <4..5>.
Event Delays
The NI 5450 supports event delays that can manually delay Marker,
Started, and Done events so that they are aligned on a particular Sample
clock period.
0
1
0
0
1
1
1
0
0
1
0
1
1
1
0
Data Marker
(bit 1)
1
1
0
1
0
0
6
0
1
2
3
4
5
Sample
Amplitude
