EP2S90F1020C5 Datasheet, PDF (677/768 Pages) Altera Corporation – Stratix II Device Handbook, Volume 1

Remote System Upgrades with Stratix II and Stratix II GX Devices
The application-not-factory (AnF) bit indicates whether the current
configuration loaded in the Stratix II or Stratix II GX device is the factory
configuration or an application configuration. This bit is set high at power
up in local update mode, and is set low by the remote system upgrade
circuitry when an error condition causes a fall-back to 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.
1
In remote update mode, factory configuration design should set
this bit high (1'b1) when updating the contents of the update
register with application page address and watchdog timer
settings.
Table 8–4. Remote System Upgrade Control Register Contents
Control Register Bit
AnF (1)
PGM[2..0]
Remote System Upgrade
Mode
Local update
Remote update
Local update
Remote update (FPP, PS,
PPA)
Remote update (AS)
PGM[6..3]
Local update
Remote update (FPP, PS,
PPA)
Remote update (AS)
Wd_en
Wd_timer[11..0]
Remote update
Remote update
Value
1’b1
1'b0
3'b001
3'b000
Definition
Application not factory
Page mode select
3'b000
4'b0000
4'b0000
AS configuration start
address
(StAdd[18..16])
Not used
4'b0000
1'b0
12'b000000000000
AS configuration start
address
(StAdd[22..19])
User watchdog timer
enable bit
User watchdog time-out
value
(most significant 12 bits of
29-bit count value:
{Wd_timer[11..0],
17'b0})
Note to Table 8–4:
(1) In remote update mode, the remote configuration block does not update the AnF bit automatically (you can
update it manually). In local update mode, the remote configuration updates the AnF bit with 0 in the factory page
and 1 in the application page.
Altera Corporation
January 2008
8–17
Stratix II Device Handbook, Volume 2