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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.
Summary of Contents for PCI-6281
Page 1: ...PCI 6281...