User`s manual

Watchdog Timer 65
cPCI-3920
6 Watchdog Timer
6.1 WDT Overview
This section explains the operation of the cPCI-3920’s Watchdog
Timer (WDT). The primary function of the WDT is to monitor the
cPCI-3920 operation and to reset the system if a software applica-
tion fails to function as programmed. The following WDT functions
may be controlled using a software application:
X enabled and disabled
X reloading timeout value
Figure 6-1: cPCI-3920 Watchdog Timer Architecture
The cPCI-3920 implements the internal WDT unit of the Intel 3100
chipset and its LPC interface. It contains registers of device6 at
Preload Value 1 Preload Value 2
LPC Interface
Down-Counter
Timeout/ Interrupt Control Logic
WDT_TOUT#
(External)
WDT_INT
(Internal)