EP3C16F256I7N Altera, EP3C16F256I7N Datasheet - Page 351

• Manufacturer Part Number: EP3C16F256I7N
• Description: Cyclone III
• Manufacturer: Altera

Figure 12–5. Remote System Upgrade Control Register
Altera Corporation-Preliminary
March 2007
Rsv2
f
38
Cd_early Osc_int Wd_en Rsv1 Ru_address[21..0] Wd_timer[11..0]
37
Remote System Upgrade Control Register
The remote system upgrade control register stores the application
configuration address, the user watchdog timer settings, and option bits
for application configuration. In remote update mode for the AS
configuration scheme, the control register address bits are set to all zeros
(24'b0) at power up to load the AS factory configuration. In remote
update mode for the AP configuration scheme, the control register
address bits are set to 24'h010000 (24'b1 0000 0000 0000 0000) at power
up to load the AP default factory configuration. However, for the AP
configuration scheme, you can change the default factory configuration
address to any desired address using the JTAG instruction
APFC_BOOT_ADDR. Additionally, a factory configuration in remote
update mode has write access to this register.
For information on the application of the JTAG instruction
APFC_BOOT_ADDR in the AP configuration scheme, refer to the
Configuring Cyclone III Devices
The control register bit positions are shown in
Table
within a register. For example, bit number 35 is the enable bit for the
watchdog timer.
The early CONF_DONE check (Cd_early) option bit, when enabled,
ensures that there is a valid configuration at the boot address specified by
the factory configuration and that it is of the proper size. The internal
oscillator as startup state machine clock (Osc_int) option bit, when
enabled, ensures a functional startup clock to eliminate the hanging of
startup. When all option bits are turned on, they provide complete
coverage for the programming and startup portions of the application
configuration. It is strongly recommended that you turn on both the
Cd_early and Osc_int option bits.
1
12–3. In the figure, the numbers show the bit position of a setting
36
The Cd_early and Osc_int option bits for the application
configuration should be turned on by the factory configuration.
35
34
Remote System Upgrade With Cyclone III Devices
33
chapter in the
Cyclone III Device Handbook, Volume 1
12
Cyclone III Device
11
Figure 12–5
0
and defined in
Handbook.
12–11