Altera Cyclone IV - Page 237

Chapter 8: Configuration and Remote System Upgrades in Cyclone IV Devices 8–73
Remote System Upgrade
May 2013 Altera Corporation Cyclone IV Device Handbook,
Volume 1
When Cyclone IV devices successfully load the application configuration, they enter
user mode. In user mode, the soft logic (the Nios II processor or state machine and the
remote communication interface) assists the Cyclone IV device in determining when a
remote system update is arriving. When a remote system update arrives, the soft logic
receives the incoming data, writes it to the configuration memory device and triggers
the device to load the factory configuration. The factory configuration reads the
remote system upgrade status register, determines the valid application configuration
to load, writes the remote system upgrade control register accordingly, and starts
system reconfiguration.