Instruction Manual
Table Of Contents
- 1 Introduction
- 2 Packing List
- 3 Connectors
- 3.1 Peripheral Interface Connectors
- 3.2 Internal Peripheral Connectors
- 3.2.1 ATX Power Connector
- 3.2.2 Battery Connectors
- 3.2.3 CPU Power Connector
- 3.2.4 DDR3 DIMM Slots
- 3.2.5 Digital I/O Connector
- 3.2.6 Fan Connector (CPU)
- 3.2.7 Fan Connector (System)
- 3.2.8 Front Panel Audio Connector
- 3.2.9 Front Panel Connector
- 3.2.10 I2C Connector
- 3.2.11 Keyboard/Mouse Connector
- 3.2.12 Parallel Port Connector
- 3.2.13 PCI Slots
- 3.2.14 PCIe x1 Slot
- 3.2.15 PCIe x4 Slot
- 3.2.16 PCIe x16 Slot
- 3.2.17 SATA 3Gb/s Drive Connector
- 3.2.18 SATA 6Gb/s Drive Connector
- 3.2.19 Serial Port Connector, RS-422/485
- 3.2.20 Serial Port Connectors, RS-232
- 3.2.21 SMBus Connector
- 3.2.22 SPDIF Connector
- 3.2.23 SPI ROM Connector
- 3.2.24 TPM Connector
- 3.2.25 USB Connectors
- 3.3 External Peripheral Interface Connector Panel
- 4 Installation
- 5 BIOS
- 5.1 Introduction
- 5.2 Main
- 5.3 Advanced
- 5.4 Chipset
- 5.5 Boot
- 5.6 Security
- 5.7 Exit
- 6 Software Drivers
- A BIOS Options
- B One Key Recovery
- C Terminology
- D Digital I/O Interface
- E Watchdog Timer
- F Hazardous Materials Disclosure
IMBA-Q670 ATX Motherboard
Page 198
NOTE:
The following discussion applies to DOS environment. Contact IEI support
or visit the IEI website for specific drivers for other operating systems.
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 EMIs or a software bug. When the CPU stops working correctly,
Watchdog Timer either performs 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 E-1: AH-6FH Sub-function
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 starts counting down. When the timer value reaches zero,
the system resets. To ensure that this reset condition does not occur, calling sub-function
2 must periodically refresh the Watchdog Timer. However, the watchdog timer is disabled
if the time-out value is set to 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.