Functional Description CP308
Page 2 - 6 ID 1027-4487, Rev. 3.0
P R E L I M I N A R Y
2.1.3 Mobile Intel® GS45 Express Chipset Overview
The Mobile Intel® GS45 Express Chipset consists of the following devices:
• Intel® GS45 Graphics Memory Controller Hub (Intel® GS45 GMCH)
• Intel® 82801IUX I/O Controller Hub (ICH9M-SFF)
The Mobile Intel® GS45 Express Chipset provides the processor interface for the Intel®
Core™2 Duo microprocessors, two DDR3 channels, and a high-performance graphics accel-
erator. The ICH9M-SFF is a centralized controller for the boards’ I/O peripherals, such as the
PCI, PCI Express, USB 2.0, SATA II, SPI and LPC ports.
2.1.3.1 Intel® GS45 Graphics Memory Controller Hub
The Intel® GS45 GMCH is a highly integrated hub that provides the CPU interface (optimized
for the Intel® Core™2 Duo microprocessor), two DDR3 SDRAM system memory interfaces at
800 MHz or 1066 MHz, a x4 DMI interface as well as a C-Link interface to the ICH9M-SFF and
either two high-performance internal graphics engines or one PCI Express x16 port for an ex-
ternal graphics chip. Additionally, the GS45 GMCH provides an Integrated Trusted Platform
Module (iTPM) for enhanced security.
2.1.3.2 I/O Controller Hub ICH9M-SFF
The ICH9M-SFF is a highly integrated multifunctional I/O Controller Hub that provides the in-
terface to the PCI bus and integrates many of the functions needed in today's PC platforms, for
example, PCI Express, SATA controller, USB host controller supporting USB 2.0, LPC inter-
face, and an SPI Flash BIOS interface controller. The ICH9M-SFF communicates with the host
controller over a dedicated DMI interface and a dedicated C-Link interface.
The I/O Controller Hub feature set comprises:
• PCI 2.3 interface with eight PCI IRQ inputs
• Eight USB controllers with up to twelve USB 1.1 or USB 2.0 ports (up to eight ports are
used on the CP308)
• Controller link interface to the GS45 GMCH
• DMI interface to the GS45 GMCH
• Two SATA I/II host controllers with four SATA ports and RAID 0/1 support
• Six PCI Express ports, two for GbE and either 4 x1 PCIe or 1 x4 PCIe for I/O expansion
• HDA controller
• SPI interface
• LPC interface
• RTC controller
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