EP4CE30F29C7N Datasheet, PDF (241/488 Pages) Altera Corporation – Cyclone IV Device Handbook, Volume 1

Chapter 8: Configuration and Remote System Upgrades in Cyclone IV Devices
Remote System Upgrade
8–77
■ External configuration reset (nCONFIG) assertion
■ User watchdog timer time out
Table 8–24 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.
Table 8–24. Remote System Upgrade Current State Logic Contents In Status Register
Remote System Upgrade
Status
Master State Machine Register Bit
Definition
Description
31:30
Master state machine The current state of the remote system upgrade
current state
master state machine
Factory information ⁽¹⁾
29:24 Reserved bits
23:0 Boot address
Padding bits that are set to all 0’s
The current 24-bit boot address that was used by
the configuration scheme as the start address to
load the current configuration.
31:30
Master state machine The current state of the remote system upgrade
current state
master state machine
Application information 1 ⁽²⁾
29
User watchdog timer The current state of the user watchdog enable,
enable bit
which is active high
Application information 2 ⁽²⁾
28:0
31:30
29:24
User watchdog timer
time-out value
Master state machine
current state
Reserved bits
The current entire 29-bit watchdog time-out
value.
The current state of the remote system upgrade
master state machine
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.
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.
May 2013 Altera Corporation
Cyclone IV Device Handbook,
Volume 1