© National Instruments 8-1 X Series User Manual
8
PFI
X Series devices have up to 16 Programmable Function Interface (PFI)
signals. In addition, X Series devices have up to 32 lines of bidirectional
DIO signals.
Each PFI can be individually configured as the following:
• A static digital input
• A static digital output
• A timing input signal for AI, AO, DI, DO, or counter/timer functions
• A timing output signal from AI, AO, DI, DO, or counter/timer
functions
Each PFI input also has a programmable debouncing filter. Figure 8-1
shows the circuitry of one PFI line. Each PFI line is similar.
Figure 8-1. X Series PFI Circuitry
Timing Signals
Direction
Control
I/O Protection
Weak Pull-Down
PFI x/P1/P2
Static DO
Buffer
To Input Timing
Signal Selectors
PFI
Filters
Static DI
PFI
Change
Detection
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