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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_CTRLCLK_AUX+

(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)

1 2 ... 27 28 29 30 31 32 33 34 35 36 37 ... 49 50

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