EP3SE50F780I3N Altera, EP3SE50F780I3N Datasheet - Page 429

• Manufacturer Part Number: EP3SE50F780I3N
• Description: Stratix III
• Manufacturer: Altera

Altera Corporation
October 2007
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Figure 12–4
configurations in remote update mode.
Figure 12–4. Transitions Between Configurations in Remote Update Mode
After power up or a configuration error, the factory configuration logic is
loaded automatically. The factory configuration also needs to specify
whether to enable the user watchdog timer for the application
configuration and if enabled, to include the timer setting information as
well.
The user watchdog timer ensures that the application configuration is
valid and functional. The timer must be continually reset within a specific
amount of time during user mode operation of an application
configuration. Only valid application configurations contain the logic to
reset the timer in user mode. This timer reset logic should be part of a
user-designed hardware and/or software health monitoring signal that
indicates error-free system operation. If the timer is not reset in a specific
amount of time; for example, the user application configuration detects a
Configuration
Communicate with the remote host and receive new application
configurations and store this new configuration data in the local
non-volatile memory device
Determine which application configuration is to be loaded into the
Stratix III device
Enable or disable the user watchdog timer and load its time-out
value (optional)
Instruct the dedicated remote system upgrade circuitry to initiate a
reconfiguration cycle
Error
Power Up
shows the transitions between the factory and application
Configuration
(page 0)
Factory
Remote System Upgrades With Stratix III Devices
Set Control Register
Set Control Register
Configuration Error
Configuration Error
and Reconfigure
and Reconfigure
Stratix III Device Handbook, Volume 1
Different Application
Different Application
Reload a
Reload a
Application 1
Configuration
Configuration
Application n
12–7