Chapter 8: Configuration and Remote System Upgrades in Cyclone IV Devices 8–77
Remote System Upgrade
May 2013 Altera Corporation Cyclone IV Device Handbook,
Volume 1
■ External configuration reset (
nCONFIG
) assertion
■ User watchdog timer time out
Tab le 8 –2 4 lists the contents of the current state logic in the status register, when the
remote system upgrade master state machine is in factory configuration or
application configuration accessing the factory information or application
information, respectively. The status register bit in Table 8–24 lists the bit positions in
a 32-bit logic.
The previous two application configurations are available in the previous state
registers (previous state register 1 and previous state register 2), but only for
debugging purposes.
Table 8–24. Remote System Upgrade Current State Logic Contents In Status Register
Remote System Upgrade
Master State Machine
Status
Register Bit
Definition Description
Factory information
(1)
31:30
Master state machine
current state
The current state of the remote system upgrade
master state machine
29:24 Reserved bits Padding bits that are set to all 0’s
23:0 Boot address
The current 24-bit boot address that was used by
the configuration scheme as the start address to
load the current configuration.
Application information 1
(2)
31:30
Master state machine
current state
The current state of the remote system upgrade
master state machine
29
User watchdog timer
enable bit
The current state of the user watchdog enable,
which is active high
28:0
User watchdog timer
time-out value
The current entire 29-bit watchdog time-out
value.
Application information 2
(2)
31:30
Master state machine
current state
The current state of the remote system upgrade
master state machine
29:24 Reserved bits Padding bits that are set to all 0’s
23:0 Boot address
The current 24-bit boot address that was used as
the start address to load the current configuration
Notes to Table 8–24:
(1) The remote system upgrade master state machine is in factory configuration.
(2) The remote system upgrade master state machine is in application configuration.
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