|NI RF Vector Signal Transceivers 18.1Help|
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PFI 0 is a 3.3 V LVTTL, bidirectional, general-purpose digital I/O signal. The most common use of PFI 0 is as a trigger input or a marker/event output. However, because the PFI 0 I/O buffer is connected directly to the FPGA, you can program the PFI 0 functionality for custom applications using LabVIEW FPGA.
Refer to the PXIe-5840 Specifications document for information about acceptable PFI 0 input and output characteristics.