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Intel® 945G/945GZ/945GC/ 945P/945PL Express Chipset Family
Datasheet - For the Intel® 82945G/82945GZ/82945GC Graphics and Memory Controller Hub (GMCH) and Intel® 82945P/82945PL Memory Controller Hub (MCH)

November 2007

Document Number: 307502-004

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INFORMATION IN THIS DOCUMENT IS PROVIDED IN CONNECTION WITH INTEL® PRODUCTS. NO LICENSE, EXPRESS OR IMPLIED, BY ESTOPPEL OROTHERWISE, TO ANY INTELLECTUAL PROPERTY RIGHTS IS GRANTED BY THIS DOCUMENT. EXCEPT AS PROVIDED IN INTEL’S TERMS AND CONDITIONS OF SALE FOR SUCH PRODUCTS, INTEL ASSUMES NO LIABILITY WHATSOEVER, AND INTEL DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY, RELATING TO SALE AND/OR USE OF INTEL PRODUCTS INCLUDING LIABILITY OR WARRANTIES RELATING TO FITNESS FOR A PARTICULAR PURPOSE, MERCHANTABILITY, ORINFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT. Intel products are not intended for use in medical, life saving, or life sustaining applications. Intel may make changes to specifications and product descriptions at any time, without notice. Designers must not rely on the absence or characteristics of any features or instructions marked "reserved" or "undefined." Intelreserves these for future definition and shall have no responsibility whatsoever for conflicts or incompatibilities arising from future changes to them. The Intel® 82945G/82945GZ/82945GC GMCH and 82945P/82945PL MCH may contain design defects or errors known as errata, which may cause the product to deviate from published specifications. Current characterized errata are available on request.Contact your local Intel sales office or your distributor to obtain the latest specifications and before placing your product order. Hyper-Threading Technology requires a computer system with an Intel® Pentium® 4 processor supporting HT Technology and a Hyper-Threading Technology enabled chipset, BIOS and operating system. Performance will vary depending on the specific hardware and softwareyou use. See http://www.intel.com/info/hyperthreading/ for more information including details on which processors support HT Technology. Intel and Pentium are trademarks or registered trademarks of Intel Corporation or its subsidiaries in the United States and other countries. *Other names and brands may be claimed as the property of others. Copyright© 2007, Intel Corporation
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Intel®82945G/82945GZ/82945GC GMCH and 82945P/82945PL MCH Datasheet

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Contents
1 Introduction ....................................................................................................................... 17 1.1 1.2 1.3 Terminology.......................................................................................................... 21 ReferenceDocuments.......................................................................................... 23 (G)MCH Overview ................................................................................................ 23 1.3.1 Host Interface........................................................................................ 24 1.3.2 System Memory Interface.....................................................................24 1.3.3 Direct Media Interface (DMI)................................................................. 25 1.3.4 PCI Express* Interface (Intel® 82945G/82945GC/82945P/82945PL (G)MCH Only) ....................................................................................... 26 Graphics (Intel® 82945G/82945GC/82945GZ GMCH Only) ................................ 27 Analog and SDVO Displays(Intel® 82945G/82945GC/82945GZ GMCH Only) .. 29 1.5.1 System Interrupts.................................................................................. 29 1.5.2 (G)MCH Clocking.................................................................................. 29 1.5.3 Power Management.............................................................................. 30 Host Interface Signals...