Dynamic reconfiguration channel interface details for Arria® II GZ devices will be added to a future revision of Application Note AN-558:Implementing Dynamic Reconfiguration in Arria II Devices (PDF).
Until the channel interface details are published in AN-558, please refer to Chapter 5 “Dynamic Reconfiguration in Stratix® IV Devices” of the Stratix IV GX Device Handbook Volume 2 (PDF). The “FPGA Fabric-Transceiver Channel Interface” section can be used for Arria II GZ devices.