Chapter 2
NI 5450 Overview
NI PXIe-5450 User Manual
2-84
ni.com
has a period of 10 ns, requiring the pulse to be lengthened for many devices
to register the marker as a good trigger pulse. Refer to the device
specifications for the timing specifications.
Markers as Trigger Outputs
A delay of at least 44 Sample clocks exists between the Start trigger and the
analog waveform generation on the output connector. Therefore,
synchronizing the signal generator output signal to other devices with fast
trigger response times is accomplished using the 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.
Data Marker Events
The Data Marker events allow you to export any one of the 16 waveform
data bits to any valid destination on the device. Up to four of the 16
waveform data bits can be exported at one time.
The level of a Data Marker event changes at the time that a specific data bit
toggles in the waveform data. If the waveform data bit toggles multiple
times in a segment, the Data Marker event level changes each time. When
the data bit level is high, the Data Marker event level is high. You can invert
this relationship by setting the Data Marker Event Level Polarity property
or the
NIFGEN_ATTR_DATA_MARKER_EVENT_LEVEL_POLARITY
attribute.
