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C2SBA+II/C2SBA+/C2SBA/C2SBE User’s Manual
1-2 Chipset Overview
The Intel G33/P35 chipset is specially designed for use with the Intel dual core
processors. It consists of two primary components: the Graphic Memory Controller
Hub (GMCH) and the I/O Controller Hub (ICH9/ICH9R). The GMCH (North Bridge)
manages the data ow between the CPU interface (FSB), the System Memory
interface, the External Graphics interface, and the I/O Controller through the DMI
(Direct Media) Interface. The ICH9/ICH9R (South Bridge) provides a multitude of
I/O related functions.
Graphic Memory Controller Hub (GMCH)
Utilizing a single LGA 775 socket processor, the G33/P35 GMCH supports an FSB
frequency of 1.33 GHz/1.06 GHz. Host-initiated I/O cycles are decoded to the PCI-
Express, the DMI, or the GMCH conguration space. Host-initiated memory cycles
are decoded to PCI-Express, DMI or system memory. The GMCH supports 36-bit
host bus addressing and a Cache Line Size of 64 bytes.
The GMCH supports one or two channels of DDR2 memory with up to two DIMMs
per channel with a maximum bandwidth of 6.4 GB/s in asymmetric mode or 12.8
GB/s in symmetric mode using DDR2 800 MHz memory. It also supports an op-
portunistic refresh scheme, a memory thermal management scheme and Partial
Writes to Memory using Data Mask (DM) signals.
The GMCH contains one PCI-Express x16 (16-lane) port intended for an external
PCI-Express graphics card that is compatible with the PCI Express Base Specica-
tion revision 1.1. This PCI-E x16 port runs at a frequency of 2.5 GB/s on each lane
and supports a maximum theoretical bandwidth of 40 GB/s in each direction for
an aggregate of 8 GB/s @ x16. It supports traditional PCI-/AGP- style trafc and a
PCI-Exp. Enhanced Addressing Mechanism with advanced capabilities in automatic
discovery, negotiation and training of link out of reset.
Providing the high-speed, chip-to-chip connection between the GMCH and ICH9/
ICH9R is the Direct Media Interface (DMI). The DMI integrates advanced priority-
based servicing, allowing for concurrent trafc, true isochronous transfer capabilities
and permitting current as well as legacy software to function seamlessly.
Intel ICH9/ICH9R System Features
The Intel 9th Generation I/O Controller Hub (ICH9/ICH9R) supports a variety of I/O
related functions and PCI devices, including the following:
DMI-to PCI Bridge•
LPC Controller•
Thermal Subsystem•
SMBus Controller•
USB FS/LS UHCI Controllers #1, #2 and #3•