Specifications

Utilities 59
cPCI-6840
5 Utilities
5.1 Watchdog Timer
This section explains the operation of the cPCI-6840’s watchdog
timer. It provides an overview of watchdog operation and features,
as well as a sample code to help you learn how the watchdog
timer works.
WDT Overview
The primary function of the watchdog timer is to monitor the cPCI-
6840’s operation and to generate IRQ or reset the system if the
software fails to function as programmed. The major features of
the watchdog timer are:
X Enabled and disabled through software control
X Armed and strobed through software control
Figure 5-1: WDT Block Diagram
PCI
Preload Value 1 Preload Value 2
PCI
Configuration
Registers
Down-Counter
Reset/ Interrupt Control Logic
WDT_TOUT#
(External)
IRQ/SMI
(Internal)
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