EP3C16F256I7N Altera, EP3C16F256I7N Datasheet - Page 356

• Manufacturer Part Number: EP3C16F256I7N
• Description: Cyclone III
• Manufacturer: Altera

Remote System Upgrade With Cyclone III Devices
12–16
Cyclone III Device Handbook, Volume 1
In factory configurations, the user logic should send the option bits
(Cd_early and Osc_int), the configuration address, and watchdog
timer settings for the next application configuration bit to the update
register. When the logic array configuration reset (RU_nCONFIG) goes
high, the remote system upgrade state machine updates the control
register with the contents of the update register and initiates system
reconfiguration from the new application page.
In the event of an error or reconfiguration trigger condition, the remote
system upgrade state machine directs the system to load a factory or
application configuration (based on mode and error condition) by setting
the control register accordingly.
register after such an event occurs for all possible error or trigger
conditions.
The remote system upgrade status register is updated by the dedicated
error monitoring circuitry after an error condition but before the factory
configuration is loaded.
Read operations during factory configuration access the contents of the
update register. This feature is used by the user logic to verify that the
configuration address and watchdog timer settings were written
correctly. Read operations in application configurations access the
contents of the control register. This information is used by the user logic
in the application configuration.
User Watchdog Timer
The user watchdog timer prevents a faulty application configuration
from stalling the device indefinitely. The system uses the timer to detect
functional errors after an application configuration is successfully loaded
into the Cyclone III device.
nCONFIGU
nSTATUS
CORE triggered reconfiguration
CRC error
Wd time out
Table 12–9. Control Register Contents After an Error or Reconfiguration
Trigger Condition
error
Reconfiguration
reset
Error/Trigger
Table 12–9
All bits are 0
All bits are 0
Update register
All bits are 0
All bits are 0
Control Register Setting In
lists the contents of the control
Altera Corporation-Preliminary
Remote Update
March 2007