CDPCLK4 datasheet(236/274 Pages) ALTERA

236 / 274 page

9–78

Chapter 9: Configuration, Design Security, and Remote System Upgrades in the Cyclone III Device Family

Remote System Upgrade

Cyclone III Device Handbook

August 2012

Altera Corporation

Volume 1

The factory configuration image is user designed and contains soft logic (Nios II

processor or state machine and the remote communication interface) to:

■

Process any errors based on status information from the dedicated remote system

upgrade circuitry

■

Communicate with the remote host and receive new application configurations

and store the new configuration data in the local non-volatile memory device

■

Determine which application configuration is to be loaded into the Cyclone III

device family

■

Enable or disable the user watchdog timer and load its time-out value (optional)

■

Instruct the dedicated remote system upgrade circuitry to start a reconfiguration

cycle

Figure 9–34 shows the transitions between the factory and application configurations

in remote update mode.

After power up or a configuration error, the factory configuration logic writes the

remote system upgrade control register to specify the address of the application

configuration to be loaded. The factory configuration also specifies whether or not to

enable the user watchdog timer for the application configuration and, if enabled,

specifies the timer setting.

1 Only valid application configurations designed for remote update mode include the

logic to reset the timer in user mode. For more information about the user watchdog

timer, refer to “User Watchdog Timer” on page 9–85.

If there is an error while loading the application configuration, the remote system

upgrade status register is written by the dedicated remote system upgrade circuitry of

the Cyclone III device family, specifying the cause of the reconfiguration.

Figure 9–34. Transitions Between Configurations in Remote Update Mode

Set Control Register

and Reconfigure

Set Control Register

and Reconfigure

Reload a Different Application

Application n

Configuration

Application 1

Configuration

Factory

Configuration

Configuration Error

Power Up

Configuration

Error

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