Chapter 9: Configuration, Design Security, and Remote System Upgrades in the Cyclone III Device Family
9–83
Remote System Upgrade
■
Cyclone III device family logic array triggered a reconfiguration cycle, possibly
after downloading a new application configuration image
External configuration reset (nCONFIG) assertion
User watchdog timer time out
■
■
Table 9–28 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, and the MSEL pin setting is set to AS or AP configuration
scheme. The status register bit in Table 9–28 lists the bit positions in a 32-bit logic.
Table 9–28. Remote System Upgrade Current State Logic Contents In Status Register (1)
Current State Logic
Status Register Bit
31:30
Definition
Description
Master State Machine The current state of the RSU master
current state
Reserved bits
state machine
29:24
Padding bits that are set to all 0's
(2)
Factory information
The current 24-bit boot address that was
used by the configuration scheme as the
start address to load the current
configuration.
23:0
Boot address
Master State Machine The current state of the RSU master
31:30
29
current state
state machine
User watchdog timer
enable bit
The current state of the user watchdog
enable, which is active high
Application information
(3)
part 1
The current entire 29-bit
watchdog time-out value
User watchdog timer
time-out value
28:0
Master State Machine The current state of the RSU master
31:30
29:24
current state
state machine
Reserved bits
Padding bits that are set to all 0’s
Application information
part 2
(3)
The current 24-bit boot address that was
used by the configuration scheme as the
start address to load the current
configuration
23:0
Boot address
Notes to Table 9–28:
(1) The MSEL pin setting is in the AS or AP configuration scheme.
(2) The RSU master state machine is in factory configuration.
(3) The RSU master state machine is in application configuration.
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.
August 2012 Altera Corporation
Cyclone III Device Handbook
Volume 1
ALTERA [ ALTERA CORPORATION ]
