© National Instruments | 4-1
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PFI
NI 6612 devices have up to 40 Programmable Function Interface (PFI) signals.
Each PFI can be individually configured as the following:
• A static digital input
• A static digital output
• A timing input signal for DI, DO, or counter/timer functions
• A timing output signal from DI, DO, or counter/timer functions
Each PFI input also has a programmable debouncing filter. Figure 4-1 shows the circuitry of one
PFI line. Each PFI line is similar.
Figure 4-1. PFI Circuitry
When a terminal is used as a timing input or output signal, it is called PFI x (where x is an integer
from 0 to 39). When a terminal is used as a static digital input or output, it is called P0.x or P1.x.
On the I/O connector, each terminal is labeled PFI x/P0.x or PFI x/P1.x.
The voltage input and output levels and the current drive levels of the PFI signals are listed in
the specifications of your device.
Timing Signals
Direction
Control
I/O Protection
Weak Pull-Down
PFI
x/P0/P1
Static DO
Buffer
To Input Timing
Signal Selectors
PFI
Filters
Static DI
PFI
Change
Detection
CI
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