LogiCORE IP AXI RC/EP Bridge for PCI Express (v1.00a) Data Sheet (AXI) - 1.00a English - The Advanced eXtensible Interface (AXI) Endpoint (EP) Bridge for PCI Express is an interface between the AXI4 bus and PCI Express. Definitions and references are provided in this document for all of the functional modules, registers, and interfaces that need to be implemented in the AXI Bridge for PCI Express. This document contains information about the AXI4 version of the core.