Altera Corporation
8–27
January 2008
Stratix II Device Handbook, Volume 2
Remote System Upgrades with Stratix II and Stratix II GX Devices
data_out[11..0]
N
Logic Array
12-bit bus used when reading parameters, which reads out the
parameter value. The parameter value is requested using the
param[]
input and by driving the read_param signal logic
high, at which point the busy signal goes logic high. When the
busy signal goes low, the value of the parameter is driven out
on this bus. The data_out[] port is only valid after a
read_param
has been issued and once the busy signal is
deasserted. At any other time, its output values are invalid. For
example, even though the data_out[] port may toggle
during a writing of a parameter, these values are not a valid
representation of what was actually written to the remote
update block. For some parameters, not all 12 bits are used, in
which case only the least significant bits are used.
(1)
Logic array destination means that you can drive the port to internal logic or any general-purpose I/O pin.
Table 8–12. Parameter Settings for the altremote_update Megafunction
(Part 1 of 2)
Selected
Parameter
param[2..0]
Bit Setting
Width of
Parameter
Value
POR Reset
Value
Description
Status
Register
Contents
000
5
5 bit '0
Specifies the reason for re-configuration,
which could be caused by a CRC error during
configuration, nSTATUS being pulled low due
to an error, the device core caused an error,
nCONFIG
pulled low, or the watchdog timer
timed-out. This parameter can only be read.
Watchdog
Timeout Value
010
12
12 bits '0
User watchdog timer time-out value. Writing of
this parameter is only allowed when in the
factory configuration.
Watchdog
Enable
011
1
1 bit '0
User watchdog timer enable. Writing of this
parameter is only allowed when in the factory
configuration
Page select
100
3 (FPP, PS,
PPA)
3 bit '001' - Local
configuration
Page mode selection. Writing of this parameter
is only allowed when in the factory
configuration.
3 bit '000' -
Remote
configuration
7 (AS)
7 bit '0000000' -
Remote
configuration
Table 8–11. Output Ports of the altremote_update Megafunction (Part 2 of 2)
Port Name
Required
Destination
Description