Chapter 3
Hardware
28
Reference Manual
nanoX-TCR
Watchdog Timer
The Watchdog Timer (WDT) restarts the system if a mishap occurs, ensuring proper start-up after the
interruption. Possible problems include failure to boot properly, the application software’s loss of control,
failure of an interface device, unexpected conditions on the bus, or other hardware or software malfunctions.
Use the ADLINK Intelligent Device Interface (AIDI) Library to configure the WDT interface. AIDI driver
information is available in the Utilities link of the nanoX-TCR product page at:
http://www.adlinktech.com
.
An AIDI demo program and the AIDI User’s Manual showing how to use the WDT function also reside in
the Utilities link of the nanoX-TCR product page.
The WDT (Watchdog Timer) can be used both during the boot process and during normal system operation.
•
During the Boot process – If the OS fails to boot in the time interval set in the AIDI Library, the system
will reset.
Enable the WDT as described in the AIDI Library User’s guide. Set the WDT for a time-out interval in
seconds, between 1 and 255, in one second increments. Ensure you allow enough time for the boot
process to complete and for the OS to boot. The OS or application must tickle the WDT as soon as it
comes up.
•
During System Operation – The user can set up the WDT hardware by accessing the hardware directly
using the AIDI Library. The system must tickle the WDT in the time set when the WDT is initialized or
the system will be reset.
•
Watchdog Code example – ADLINK provides a source code example (AIDI demo program) in the
Utilities link of the nanoX-TCR product page illustrating how to control the WDT. The code example
can be easily copied to your development environment to compile and test or make any desired changes
before compiling.
A98
SER0_TX
B98
DDI0_CTRL
(SDVO Control Clock)
A99
SER0_RX
B99
DDI0_CTRLDATA_AUX-
(SDVO Control Data)
A100
GND
B100
GND
A101
SER1_TX
B101
FAN_PWMOUT (Fan Speed Control)
A102
SER1_RX
B102
FAN_TACHIN (Fan Tachometer -
PU 10k 3.3V)
A103
LID# (ACPI type LID Switch -
PU 10k 3.3V S5 Standby)
B103
SLEEP# (GPIO4 of PCH -
PU 10k 3.3V S5
Standby)
A104
VCC_12V
B104
VCC_12V
A105
VCC_12V
B105
VCC_12V
A106
VCC_12V
B106
VCC_12V
A107
VCC_12V
B107
VCC_12V
A108
VCC_12V
B108
VCC_12V
A109
VCC_12V
B109
VCC_12V
A110
GND
B110
GND
Table 3-5. COM Express A-B Connector Signal Descriptions (Continued)
