EP4SE360F35I4 Datasheet, PDF (395/432 Pages) Altera Corporation – This section provides a complete overview of all features relating to the Stratix IV device family, which is the most architecturlly advanced

Chapter 10: Configuration, Design Security, and Remote System Upgrades in Stratix IV Devices
Dedicated Remote System Upgrade Circuitry
10–59
The application-not-factory (AnF) bit indicates whether the current configuration
loaded in the Stratix IV device is the factory configuration or an application
configuration. This bit is set low by the remote system upgrade circuitry when an
error condition causes a fall-back to the factory configuration. When the AnF bit is
high, the control register access is limited to read operations. When the AnF bit is low,
the register allows write operations and disables the watchdog timer.
In remote update mode, the factory configuration design sets this bit high (1'b1) when
updating the contents of the update register with the application page address and
watchdog timer settings.
Table 10–15 lists the remote system upgrade control register contents.
Table 10–15. Remote System Upgrade Control Register Contents
Control Register Bit
Remote System
Upgrade Mode
Value (2)
Definition
AnF (1)
Remote update
1'b0
Application not factory
PGM[23..0]
Remote update
24'b0×000000
AS configuration start address
(StAdd[23..0])
Wd_en
Remote update
1'b0
User watchdog timer enable bit
User watchdog time-out value
Wd_timer[11..0]
Remote update
12'b000000000000
(most significant 12 bits of 29-bit
count value: {Wd_timer[11..0],
17'b0})
Notes to Table 10–15:
(1) In remote update mode, the remote configuration block does not update the AnF bit automatically (you can update it manually).
(2) This is the default value of the control register bit.
Remote System Upgrade Status Register
The remote system upgrade status register specifies the reconfiguration trigger
condition. The various trigger and error conditions include:
■ Cyclic redundancy check (CRC) error during application configuration
■ nSTATUS assertion by an external device due to an error
■ Stratix IV device logic array triggered a reconfiguration cycle, possibly after
downloading a new application configuration image
■ External configuration reset (nCONFIG) assertion
■ User watchdog timer time-out
September 2012 Altera Corporation
Stratix IV Device Handbook
Volume 1