IEI Technology IMBA-9454, User Manual

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IMBA-9454 Motherboard
Page 19
The remaining four PCI bus masters are reserved for four PCI expansion boards that can
be installed on the backplane.
2.6.6 Intel
®
ICH7 Real Time Clock
256 bytes of battery backed RAM is provided by the Motorola MC146818A real time clock
(RTC) integrated into the ICH7. The RTC operates on a 3V battery and 32.768KHz crystal.
The RTC keeps track of the time and stores system data even when the system is turned
off.
2.6.7 Intel
®
ICH7 SATA Controller
The integrated SATA controller on the ICH7 southbridge supports four SATA drives with
independent DMA operations. SATA controller specifications are listed below.
Supports four SATA drives
Supports 3.0Gb/s data transfer speeds
Supports Serial ATA Specification, Revision 1.0a and supports several
optional sections of the Serial ATA II: Extensions to Serial ATA 1.0
Specification, Revision 1.0 (AHCI support is required for some elements).
2.6.8 Intel
®
ICH7 USB Controller
Up to eight high-speed, full-speed or low-speed USB devices are supported by the ICH7.
High-speed USB 2.0, with data transfers of up to 480MB/s, is enabled with the ICH7
integrated Enhanced Host Controller Interface (EHCI) compliant host controller. USB
full-speed and low-speed signaling is supported by the four ICH7 integrated Universal
Host Controller Interface (UHCI) controller.
2.7 PCI Bus Components
2.7.1 PCI Bus Overview
The PCI bus controller on the ICH7 southbridge is compliant with PCI Revision 2.3
specifications and has a 33MHz PCI clock. The components listed below are all
connected to the PCI bus: