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:

P64H

 

FWH

 

ICH

 

MCH

• 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), Enhanced 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.

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