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Chapter 9
Digital Routing and Clock Generation
Using RTSI Terminals as Timing Input Signals
You can use RTSI terminals to route external timing signals to many different M Series
functions. Each RTSI terminal can be routed to any of the following signals:
•
AI Convert Clock (ai/ConvertClock)
•
AI Sample Clock (ai/SampleClock)
•
AI Start Trigger (ai/StartTrigger)
•
AI Reference Trigger (ai/ReferenceTrigger)
•
AI Pause Trigger (ai/PauseTrigger)
•
AI Sample Clock Timebase (ai/SampleClockTimebase)
•
AO Start Trigger (ao/StartTrigger)
•
AO Sample Clock (ao/SampleClock)
•
AO Sample Clock Timebase (ao/SampleClockTimebase)
•
AO Pause Trigger (ao/PauseTrigger)
•
Counter input signals for either counter—Source, Gate, Aux, HW_Arm, A, B, or Z
•
DI Sample Clock (di/SampleClock)
•
DO Sample Clock (do/SampleClock)
Most functions allow you to configure the polarity of PFI inputs and whether the input is edge
or level sensitive.
RTSI Filters
You can enable a programmable debouncing filter on each PFI, RTSI, or PXI_STAR signal.
When the filters are enabled, your device samples the input on each rising edge of a filter clock.
M Series devices use an onboard oscillator to generate the filter clock with a 40 MHz frequency.
Note
NI-DAQmx
only
supports filters on counter inputs.
The following is an example of low to high transitions of the input signal. High to low transitions
work similarly.
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