User`s guide

50 • Utilities

The cPCI-6765(A)’s custom watchdog timer circuit is implemented in a

programmable logic device. The watchdog timer contains a "Control and

Status Register". The register allows the BIOS or user applications to

determine if a watchdog time out was the source of a particular reset.

• The watchdog times out after a selected timeout interval.

• A hard reset occurs.

The timeout period is 1 – 255 seconds or 1 – 255 minutes.

5.1.1 Using the Watchdog in an Application

The following topic is provided to help you learn how to use the watchdog

in an application. The watchdog’s Reset function is described. The

Watchdog Reset is controlled through the watchdog’s "Control and Status

Watchdog Reset

An application using the reset feature enables the watchdog reset, sets

the terminal count period, and periodically strobes the watchdog to keep it

from resetting the system. If a strobe is missed, the watchdog times out

and resets the system hardware.

For a detailed programming sample, please refer to the sample code

provided with the CD-ROM located at :\CHIPDRV\WDT\DOS\WDT.CPP