Hi,
the following information should answer your question:
X Series devices have up to 16 PFI lines. Each PFI can be individually configured as the following:
- Static Digital Input
- Static Digital Output
- Timing Input Signal for AI, AO, DI, DO, or counter/timer functions
- Timing Output Signal from AI, AO, DI, DO, or counter/timer functions
Each PFI can be individually configured as a static digital input or a static digital output. When a terminal is used as a static digital input or output, it is called P1.x or P2.x. On the I/O connector, each terminal is labeled PFI x/P1.x or PFI x/P2.x. The voltage input and output levels and the current drive levels of the PFI signals are listed in the specifications of your device.
Also, PFI can be configured to detect digital changes. The values on the PFI lines cannot be read in a hardware-timed task, but they can be used to fire the change detection event. For example, if you wanted to do change detection on eight timed DIO lines but wanted to ensure that the value of
the lines was updated every second independent of the eight lines changing you could set a PFI line up for change detection and connect a 1 Hz signal to it.
You can enable a programmable debouncing filter on each PFI, RTSI, PXI_STAR, or PXIe-DSTAR<A, B> signal. When the filters are enabled, your device samples the input on each rising edge of a filter clock. X Series devices use an onboard oscillator to generate the filter clock.
Regards,
Michael
