The PXIe-5163 includes general purpose digital lines. You can connect to these resources through either the front panel SMB PFI 0 or AUX 0 I/O connector using a supported cable and accessory. NI provides the SCB-19 (NI part number 783959-01) to connect the AUX 0 I/O connector. These signals are 3.3 V LVCMOS bidirectional digital signals and may be used in a variety of applications.
The PFI signals are connected to the FPGA through 3.3 V LVCMOS buffers. These buffers allow for direction control, isolation to protect the FPGA from overvoltage conditions, and excellent signal quality through the matched 50 Ω output impedance. For exact I/O levels and input and output impedances, refer to the device specifications.
The digital lines are protected against overvoltage conditions. The device provides this protection through a combination of diode clamps to the +3.3 V and GND lines and a positive temperature coefficient resistor for impedance matching.