EP3C16F256I7N Altera, EP3C16F256I7N Datasheet - Page 350

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

Remote System Upgrade With Cyclone III Devices
12–10
Cyclone III Device Handbook, Volume 1
Remote System Upgrade Registers
The remote system upgrade block contains a series of registers that store
the configuration addresses, watchdog timer settings, and status
information. These registers are detailed in
The remote system upgrade control and status registers are clocked by
the 10-MHz internal oscillator (the same oscillator that controls the user
watchdog timer). However, the remote system upgrade shift and update
registers are clocked by the user clock input (RU_CLK).
Shift register
Control register
Update register
Status register
Table 12–2. Remote System Upgrade Registers
Register
update, status, and control registers to be written and
sampled by user logic. Write access is enabled in remote
update mode for factory configurations to allow writes to the
update register. Write access is disabled for all application
configurations in remote update mode.
This register contains the current configuration address, the
user watchdog timer settings, one option bit for checking
early
internal oscillator as the startup state machine clock. During
a read operation in an application configuration, this register
is read into the shift register. When a reconfiguration cycle
is initiated, the contents of the update register are written
into the control register.
This register contains data similar to that in the control
register. However, it can only be updated by the factory
configuration by shifting data into the shift register and
issuing an update operation. When a reconfiguration cycle
is triggered by the factory configuration, the control register
is updated with the contents of the update register. During a
read in a factory configuration, this register is read into the
shift register.
This register is written to by the remote system upgrade
circuitry on every reconfiguration to record the cause of the
reconfiguration. This information is used by the factory
configuration to determine the appropriate action following
a reconfiguration. During a capture cycle, this register is
read into the shift register.
This register is accessible by the logic array and allows the
CONF_DONE
, and one option bit for selecting the
Description
Altera Corporation-Preliminary
Table
12–2.
March 2007