I/O Standard and Placement - 3.0 English

AXI Bridge for PCI Express Gen3 Subsystem Product Guide (PG194)

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3.0 English

The sys_reset_n input should be driven directly by FPGA I/O pins. The pin should be driven by the PCI Express® edge connector reset signal (perstn). As described in the PCI Express® Specification, the PCI Express edge connector reset is driven at 3.3V. If the bank voltage for the sys_reset_n pin differs from 3.3V, and external level shifter is required to convert the 3.3V PCI Express edge connector reset (perstn) to the desired FPGA bank voltage.