IMB-8550 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 provided to ensure that standalone systems can always recover from
catastrophic conditions that cause the CPU to crash. This condition may have occurred by external
EMI or a software bug. When the CPU stops working correctly, Watchdog Timer will either perform
a hardware reset (cold boot) or a Non-Maskable Interrupt (NMI) to bring the system back to a
known state.
A BIOS function call (INT 15H) is used to control the Watchdog Timer:
INT 15H:
AH – 6FH Sub-function:
AL – 2:
Sets the Watchdog Timer’s period.
BL:
Time-out value (Its unit-second is dependent on the item “Watchdog
Timer unit select” in CMOS setup).
Table A
-
1 AH-6FH Sub-function
You have to call sub-function 2 to set the time-out period of Watchdog Timer first. If the time-out
value is not zero, the Watchdog Timer will start counting down. While the timer value reaches zero,
the system will reset. To ensure that this reset condition does not occur, calling sub-function 2
must periodically refresh the Watchdog Timer. However, the Watchdog timer will be disabled if you
set the time-out value to be zero.
A tolerance of at least 10% must be maintained to avoid unknown routines within the operating
system (DOS), such as disk I/O that can be very time-consuming.
A-2
IEI
®
Technology, Corp.
A-2
Summary of Contents for IMB-8550
Page 13: ...IMB 8550 Chapter 1 Introduction 1 1 1 1 ...
Page 22: ...IMB 8550 User Manual This page is intentionally left blank 1 10 1 10 IEI Technology Corp ...
Page 23: ...IMB 8550 Functional Description Chapter 2 2 1 2 1 ...
Page 40: ...IMB 8550 User Manual Figure 2 8 CN3 Front Panel Connector 2 18 2 18 IEI Technology Corp ...
Page 44: ...IMB 8550 User Manual Figure 2 10 IDE Connectors 2 22 2 22 IEI Technology Corp ...
Page 46: ...IMB 8550 User Manual Figure 2 11 FDD1 Port 2 24 2 24 IEI Technology Corp ...
Page 50: ...IMB 8550 User Manual Figure 2 14 LVDS LCD Panel Connection Port 2 28 2 28 IEI Technology Corp ...
Page 54: ...IMB 8550 User Manual Figure 2 17 CN7 SPDIF Input 2 32 2 32 IEI Technology Corp ...
Page 62: ...IMB 8550 User Manual This page is intentionally left blank 2 40 2 40 IEI Technology Corp ...
Page 63: ...IMB 8550 Installation Chapter 3 3 1 3 1 ...
Page 84: ...IMB 8550 User Manual This page is intentionally left blank 3 22 3 22 IEI Technology Corp ...
Page 85: ...IMB 8550 AMI BIOS Setup Chapter 4 4 1 4 1 ...
Page 125: ...IMB 8550 Chapter 5 Software Drivers 5 1 ...
Page 141: ...IMB 8550 Watchdog Timer Appendix A A 1 A 1 ...
Page 144: ...IMB 8550 User Manual This page is intentionally left blank A 4 IEI Technology Corp A 4 ...
Page 145: ...ICPMB 8550 Address Mapping Appendix B B 1 B 1 ...
Page 148: ...ICPMB 8550 User Manual This page is intentionally left blank B 4 B 4 IEI Technology Corp ...
Page 149: ...PCIE 9450 ALi RAID for SATA Appendix C C 1 C 1 ...
Page 161: ...IMB 8550 Index I 1 ...