EmCORE-i6315

6
ON
1 2 3 4
Watchdog Timer
The onboard watchdog timer can be disabled by jumper setting or enabled for
either reboot by RESET or invoking an NMI.(non-maskable interrupt).
Even if enabled by jumper setting upon boot the watchdog timer is always
inactive. To initialize the watchdog timer reading of port 444H is sufficient. To
disable the watchdog timer read port 44H.
After the watchdog timer has been initialized by reading port 444H, it has to
be strobed at preconfigured intervals to keep it from issuing a RESET or NMI.
Intervals can also be selected by jumper setting. Strobing of the watchdog is
done by reading port the same port that initializes the watchdog timer: port
444H. Failure to strobe before the configured period expires, indicating a
program halt/abort, resulting in a RESET or NMI.
Mode Setting (JWDT1)
Watchdog Mode
JWDT1
RESET 2-3
I0CHK (Active NMI) 1-2
Disable Watchdog timer
OFF
default setting
JWDT1
3
2
1
C&T
69000
VT8605
"Northbridge"
EmCORE-i3615
REV : 1.0
VT82C686B
"Southbridge"
i Intel
82559
SWDT1
PGA 370
ON
DiskOnChip2000
1 2 3 4
Time-out Setting (SWDT1)
default setting
Watchdog Time-out Period 1 2 3 4
1 sec OFF OFF ON OFF
2 sec OFF OFF ON ON
10 sec OFF ON OFF OFF
20 sec OFF ON OFF ON
110 sec ON OFF OFF OFF
220 sec ON OFF OFF ON
EmCORE-i6315 User's Manual
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