Kontron EPIC/CE, Руководство пользователя

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20 Watchdog Timer
Kontron User's Guide EPIC/CE 57
20 Watchdog Timer
The watchdog timer (WDT) is integrated in the Winbond W83627HF controller of the EPIC/CE 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 timer is not triggered
because proper software execution fails or a hardware malfunction occurs, it resets the system or
generates the NMI.
20.1 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 timer 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 Initializing the WDT
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 Triggering the WDT
The watchdog timer needs to be triggered out of the application software within a specified timeout
period. You can only do this in the application software with the 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 chapter and separate documents that are available in the JIDA software packages on
the Kontron Web site.