Configuration via Protocol (CvP) Implementation in V-series FPGA Devices User Guide

ID 683889
Date 9/04/2020
Public
Document Table of Contents

2.3. Alternative to CvP Initialization: Autonomous HIP Mode

Autonomous mode is useful when you are not using CvP initialization to configure the FPGA, but still need to satisfy the 100 ms PCIe wake up time requirement. Altera’s FPGA devices always receive the configuration bits for the periphery image first, then for the core image. After the core image configures, the device enters user mode. In autonomous HIP mode, the Hard IP for PCI Express begins operation when the periphery configuration completes. Autonomous HIP mode allows the PCIe IP core to operate before the device enters user mode, during on-going core configuration.

In autonomous HIP mode, after completing link training, the Hard IP for PCI Express responds to Configuration Requests from the host with a Configuration Request Retry Status (CRS).

Arria V, Cyclone V, and Stratix V are the first devices to offer autonomous mode. In earlier devices, the PCI Express IP Core was released from reset only after the FPGA core was fully configured.