IEI Technology IMBA-XQ354, User Manual

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IMBA-XQ354 Motherboard
Page 20
2.6.6 Real Time Clock
256 bytes of battery backed RAM is provided by the Motorola MC146818B real time clock
(RTC) integrated into the ICH9DO. The RTC operates on a 3 V battery and 32.768 KHz
crystal. The RTC keeps track of the time and stores system data even when the system is
turned off.
2.6.7 SATA Controller
The ICH9DO has six SATA channels. The ICH9DO SATA supports three modes of
operation:

Native IDE enabled operating system:

Legacy operating system is used

AHCI or RAID mode
In the AHCI or RAID mode, 3.0 Gb/s data transfer speeds are supported.
2.6.8 Serial Peripheral Interface (SPI) BIOS
The 4-pin SPI is connected to an SPI BIOS chip. A licensed copy of AMI BIOS is
preinstalled on the SPI BIOS chip. A master-slave protocol is used for communication on
the SPI bus. The slave is connected to the Intel® ICH9DO Southbridge and is
implemented as a tri-state bus.
2.6.9 USB Controller
The ICH9DO supports 12 USB devices with low/full/hi-speed capabilities. Four USB ports
are available on the rear panel, while eight are available through pin headers on the
board.
2.7 LPC Bus Components
The LPC bus provides a connection for legacy devices and is connected to the:

iTE IT8718F super I/O chipset

Fintek F81216DG serial port chipset