Intel 925 Data Sheet - Page 13

Introduction R 1 Introduction The Intel® 925X Express chipset and Intel® 925XE Express chipset are designed for use with the Intel® Pentium® 4 processor in entry-level, uniprocessor, workstation platforms. The chipsets contain two components: 82925X or 82925XE Memory Controller Hub (MCH) for the host bridge and I/O Controller Hub 6 (ICH6) for the I/O subsystem. The MCH provides the interface to the processor, main memory, PCI Express, and the ICH6. The ICH6 is the sixth generation I/O Controller Hub and provides a multitude of I/O related functions. Figure 1-1 shows an example system block diagram for the 925X/925XE Express chipset. For great workstation application flexibility, the Intel® 925X/925XE Express chipset is specifically designed to support Intel® Extended Memory 64 Technology Φ (Intel® EM64T) enabling 64-bit memory addressability. Select versions of the Pentium 4 processor support Intel EM64T) as an enhancement to Intel's IA-32 architecture on workstation platforms. This enhancement enables the processor to execute operating systems and applications written to take advantage of Intel EM64T. Further details on the 64-bit extension architecture and programming model can be found in the Intel® Extended Memory 64 Technology Software Developer Guide at http://developer.intel.com/technology/64bitextensions/. This document is the datasheet for the Intel® 82925X MCH and Intel® 82925XE MCH. Topics covered include; signal description, system memory map, register descriptions, a description of the MCH interfaces and major functional units, electrical characteristics, ballout definitions, and package characteristics. Note: Φ Intel® Extended Memory 64 Technology (Intel® EM64T) requires a computer system with a processor, chipset, BIOS, operating system, device drivers and applications enabled for Intel EM64T. Processor will not operate (including 32-bit operation) without an Intel EM64T-enabled BIOS. Performance will vary depending on your hardware and software configurations. See www.intel.com/info/em64t for more information including details on which processors support EM64T or consult with your system vendor for more information. Note: Unless otherwise specified, the information in this document applies to both the 82925X MCH and 82925XE MCH. Note: Unless otherwise specified, ICH6 refers to the Intel® 82801FB ICH6 and 82801FR ICHR I/O Controller Hub components. Intel® 82925X/82925XE MCH Datasheet 13