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Chapter 8
PFI
The voltage input and output levels and the current drive levels of the PFI signals are listed in
the specifications of your device.
Using PFI Terminals as Timing Input Signals
Use PFI terminals to route external timing signals to many different M Series functions. Each
PFI 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, 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.
Exporting Timing Output Signals Using PFI
Terminals
You can route any of the following timing signals to any PFI terminal configured as an output:
•
AI Convert Clock* (ai/ConvertClock)
•
AI Hold Complete Event (ai/HoldCompleteEvent)
•
AI Reference Trigger (ai/ReferenceTrigger)
•
AI Sample Clock (ai/SampleClock)
•
AI Start Trigger (ai/StartTrigger)
•
AO Sample Clock* (ao/SampleClock)
•
AO Start Trigger (ao/StartTrigger)
Counter n Source
•
Counter n Gate
•
Counter n Internal Output
•
8-2 | ni.com
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