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2 System Board
Chipset
Chipset
The Intel
®
I840 chipset is a high-integration chipset designed for graphics/
multimedia PC platforms and is comprised of the following:
• The 82840 Memory Controller Hub (MCH) is a bridge between: the Host
bus, Dual Rambus bus (main memory), the PCI bus (64-bits/66 MHz),
AGP 4x (graphic) bus, Hub Link 8-bit and Hub Link 16-bit, and the
PCI 64-bit Hub (P64H). The MCH chip feature is described in detail on
page 35
.
• The PCI 64-bit Hub (P64H) performs PCI bridging between the MCH and
the PCI 64-bit 66 MHz bus. The P64H is described in detail on page 44
.
• The 82801AA Input/Output Controller Hub (ICH) is a bridge between the
following buses: the PCI bus (32-bits/33 MHz) and SMBus. In addition,
the ICH supports the integrated IDE controller (Ultra ATA/66), En-
hanced DMA controller, USB controller, Interrupt controller, Low Pin
Count (LPC) interface, FWH interface, ACPI Power Management
Logic, AC’97 2.1 Compliant Link, AOL (Alert-On-LAN) and Real
Time Clock (RTC) and CMOS. The ICH is described in detail on page 48
.
• The 82802AB Firmware Hub (FWH) stores system BIOS and SCSI BIOS,
nonvolatile memory component. In addition, the FWH contains an Intel®
Random Number Generator (RNG). The RNG provides random numbers
to enable fundamental security building blocks for stronger encryption,
digital signing and security protocols for the PC Workstation. The FWH is
described in detail on page 62
.
P64H FWH ICH MCH