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Chipset Overview
The Intel® 82945GC chipset, designed for use with the Intel® LGA 775 processor
with a front side bus speed of up to 800 MHz, contains two components: GMCH
(North Bridge) and ICH7 (South Bridge). The GMCH is used for the host bridge,
and the ICH7, for the I/O subsystems.
Graphics Memory Controller Hub (GMCH)
The GMCH manages the data flow between its four interfaces: the processor
interface (FSB), the system memory interface (DRAM controller), the integrated
graphics interface, the External Graphics interface, and the I/O Controller through
DMI interface. It provides bus arbitration between the four interfaces when each
initiates transactions. The GMCH supports a 32-byte Cache Line, decoding up to 4
GB (2GB for the 945GC) of the CPU's usable memory address space. The GMCH
also supports one or two channels of SDRAM and the PCI Express-based graphics
attached devices.
The Intel® 945GC platform supports the seventh generation I/O Controller Hub (In-
tel® ICH7) to provide a multitude of I/O related features. The Direct Media Interface
(DMI) provides the chip-to-chip connection between the GMCH and the ICH7.
Intel® I/O Controller Hub 7 (ICH7)
The I/O Controller (ICH7) provides the data buffering and interface arbitration re-
quired for the system to operate efficiently. It also provides the bandwidth needed
for the system to maintain its peak performance. The ICH7 supports PCI slots, Serial
ATA ports, USB 2.0 ports and dual channel IDE devices.
Intel® 82945GC Features
The Intel 945GC supports the following features:
•
PCI Express 2.0
•
Intel Flex Memory Technology
•
Intel High Definition Audio
•
Intel Matrix Storage Technology
•
Intel Rapid Recover Technology
•
Serial Peripheral Interface (SPI)
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Chapter 1: Introduction
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