Intel® 945G/945GZ/945GC/ 945P/945PL Express Chipset Family ...

1 Introduction
Introduction
The Intel ® 945G/945GZ/945GC/945P/945PL Express chipsets are designed for use with the
Intel ® Core TM 2 Duo, Intel ® Celeron 400 series, Intel ® Pentium ® D processor, Intel ® Pentium ® 4
processor. Additionally, Intel ® 945GC Express chipsets also support Intel ® Atom TM Processor 200
Series and Intel ® Atom TM Processor 300 Series. Each chipset contains two components: GMCH
(or MCH) for the host bridge and I/O Controller Hub 7 (ICH7) for the I/O subsystem. The
82945G GMCH is part of the 945G Express chipset, 82945GZ GMCH is part of the 945GZ
Express chipset, 82945GC GMCH is part of the 945GC Express chipset, 82945P MCH is part of
the 945P Express chipset, and 82945PL MCH is part of the 945PL Express chipset. The ICH7 is
the seventh generation I/O Controller Hub and provides a multitude of I/O related functions.
Figure 1-1, Figure 1-2, and Figure 1-3 show example system block diagrams for the 945G,
945GZ, 945GC and 945P/945PL Express chipsets.
This document is the datasheet for the Intel ® 82945G Graphics and Memory Controller Hub
(GMCH), Intel ® 82945GZ Graphics and Memory Controller Hub (GMCH), Intel ® 82945GC
Graphics and Memory Controller Hub (GMCH), Intel ® 82945P Memory Controller Hub (MCH),
and Intel ® 82945PL Memory Controller Hub (MCH). Topics covered include; signal description,
system memory map, PCI register description, a description of the (G)MCH interfaces and major
functional units, electrical characteristics, ballout definitions, and package characteristics.
The primary differences between the 82945G GMCH, 82945GZ GMCH, 92945GC GMCH,
82945P MCH, and 82945PL are listed below:
Intel® Atom TM
Processor 200
and 300 Series
Integrated
Graphics Device
(and associated
SDVO and
analog display
ports)
PCI Express
Interface
Intel ®
82945G
FSB Frequency 1066/800/533
MHz
Memory Speed DDR2-
667/533/400
System Memory
Maximum
Intel ®
82945GZ
Intel ®
82945GC
Intel ®
82945P
Intel ®
82945PL
No No Yes No No
Yes Yes Yes No No
Yes No Yes Yes Yes
800/533 MHz 800/533 MHz 1066/800/533
MHz
DDR2-
533/400
DDR2-
667/533/400
DDR2-
667/533/400
800/533
MHz
DDR2-
533/400
4 GB 2 GB 2 GB 4 GB 2 GB
Note: Unless otherwise specified, the information in this document applies to Intel ® 82945G Graphics
and Memory Controller Hub (GMCH), Intel ® 82945GZ Graphics and Memory Controller Hub
(GMCH), Intel ® 82945GC Graphics and Memory Controller Hub (MCH), Intel ® 82945P Memory
Intel ® 82945G/82945G/82945GC GMCH and 82945P/82945PL MCH Datasheet 17