Kontron EPIC/PM, Руководство пользователя

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20 19BWatchdog Timer
Kontron User's Guide
EPIC/PM
58
20
20.1
Watchdog Timer
The watchdog timer is integrated in the onboard SMSC SCH3114 controller of the EPIC/PM and can issue
a reset to the system or generate a non-maskable interrupt (NMI). The watchdog timer circuit has to be
triggered within a specified time by the application software. If the watchdog is not triggered because
proper software execution fails or a hardware malfunction occurs, it will reset the system or generate the
NMI.
Configuration
You can set the watchdog timer to disabled, reset or NMI mode. You can specify the delay time and the
timeout (trigger period) from 1 second to 30 minutes. The delay time is the time after first initialization
before the trigger period starts. The timeout is the time the watchdog has to be triggered within. You
can make the initialization settings in the BIOS setup. Refer to the
Watchdog Settings Submenu in the
Appendix B: BIOS Operation chapter for information on configuration.
20.2 Programming
20.2.1 Initialization
You can initialize the watchdog timer from the BIOS setup. You also can set up the initialization from the
application software with help of the JIDA (Jumptec Intelligent Device Architecture) programmer’s
interface.
20.2.2 Trigger
The watchdog needs to be triggered out of the application software within a specified timeout period.
You can only do this in the application software with help of the JIDA programmer’s interface.
For information about the JIDA programmer’s interface refer to the JIDA BIOS extension section in the
Appendix B: BIOS Operation and separate documents available in the JIDA software packages on the
Kontron Web site.