Cyclone® V Device Handbook: Volume 1: Device Interfaces and Integration

ID 683375
Date 10/18/2023
Document Table of Contents

7.12.6. Remote System Upgrade State Machine

The operation of the remote system upgrade state machine is as follows:

  1. After power-up, the remote system upgrade registers are reset to 0 and the factory configuration image is loaded.
  2. The user logic sets the AnF bit to 1 and the start address of the application image to be loaded. The user logic also writes the watchdog timer settings.
  3. When the configuration reset (RU_CONFIG) goes low, the state machine updates the control register with the contents of the update register, and triggers reconfiguration using the application configuration image.
  4. If error occurs, the state machine falls back to the factory image. The control and update registers are reset to 0, and the status register is updated with the error information.
  5. After successful reconfiguration, the system stays in the application configuration.