WAFER-LX User Manual
NOTE:
The following discussion applies to DOS environment. It is recommended
you contact IEI support or visit our website for specific drivers for more
sophisticated operating systems, e.g., Windows and Linux.
The Watchdog Timer is a device to ensure that standalone systems can always recover from
catastrophic conditions that cause the CPU to crash. This condition may have occurred by EMI
or a software bug. When the CPU stops working normally, hardware on the board will perform
hardware reset (cold boot) to bring the system back to a known state.
Three I/O ports control the Watchdog Timer:
443
Write
Set Watchdog time period
443 (hex)
Read
Enable the refresh to the Watchdog Timer
043/843 (hex)
Read
Disable the Watchdog Timer
Table
-
1 I/O Ports to Watchdog Timer
Prior to enable the Watchdog Timer, users have to define the Timer first. The output data is a
value of time interval and the range of the value is from 01 (hex) to FF (hex) and the range for time
interval ranges from 1 second to 255 seconds.
DATA
TIME INTERVAL
01 1
sec
02 2
sec
03 3
sec
04 4
sec
- - -
- - -
FF 255
sec
Table
-
2 Watchdog Timer Output Data
This will enable and activate the countdown timer which eventually time out and reset the CPU to
ensure that this reset condition does not occur; the Watchdog Timer must be periodically
refreshed by reading the same I/O port 043/843H and 443H. This must be done within the time
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IEI
®
Technology, Corp.
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Содержание WAFER-LX
Страница 1: ...WAFER LX 3 5 Profile WAFER Embedded Board User Manual RoHS Compliant ...
Страница 11: ...WAFER LX Chapter 1 Introduction 1 1 1 1 ...
Страница 13: ...WAFER LX Figure 1 2 WAFER LX Board Layout Soldering Side 1 3 1 3 ...
Страница 22: ...WAFER LX Functional Description Chapter 2 2 1 2 1 ...
Страница 25: ...WAFER LX User Manual Block Diagram Figure 2 1 System Block Diagram 2 4 2 4 IEI Technology Corp ...
Страница 54: ...WAFER LX Installation Chapter 3 3 1 3 1 ...
Страница 66: ...WAFER LX Award BIOS Setup Chapter 4 4 1 4 1 ...
Страница 115: ...WAFER LX Watchdog Timer Appendix A A 1 A 1 ...
Страница 118: ...WAFER LX User Manual IN AL DX EXIT AP A 4 IEI Technology Corp A 4 ...
Страница 119: ...WAFER LX Connecting ATX Power Supply Appendix B B 1 B 1 ...
Страница 122: ...WAFER LX User Manual This page is intentionally left blank B 4 B 4 IEI Technology Corp ...
Страница 123: ...WAFER LX ALi RAID for SATA Appendix C C 1 C 1 ...
Страница 138: ...WAFER LX User Manual This page is intentionally left blank C 16 IEI Technology Corp C 16 ...
Страница 139: ...WAFER LX Index I 1 ...