Supermicro C2SBM-Q User Manual download pdf (Page 15)

Chapter 1: Introduction

1-9

1-2 Chipset Overview

The Intel Q35 Chipset is specially designed for use with Intel Core 2 Duo and Quad

processors. It consists of two primary components: the Graphic Memory Control-

ler Hub (GMCH) and the I/O Controller Hub (ICH9DO). The GMCH manages the

data ow between the CPU interface, the System Memory interface, the External

Graphics interface, and the I/O Controller through the DMI (Direct Media) Interface.

The ICH9DO provides a multitude of I/O related functions.

Graphic Memory Controller Hub (GMCH)

Utilizing a single LGA 775 socket processor, the Q35 GMCH supports an FSB

frequency of 1333/1066/800 MHz. Host-initiated I/O cycles are decoded to the PCI-

Express, the DMI, or the GMCH conguration 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 port intended for an external PCI-Express

graphics card that is compatible with the PCI Express Base Specication 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 trafc and a PCI-Exp. Enhanced

Addressing Mechanism with advanced capabilities in automatic discovery, negotia-

tion and training of link out of reset.

Providing the high-speed, chip-to-chip connection between the GMCH and ICH9

is the Direct Media Interface (DMI). The DMI integrates advanced priority-based

servicing, allowing for concurrent trafc, true isochronous transfer capabilities and

permitting current as well as legacy software to function seamlessly.

Intel ICH9DO System Features

The Intel 9th Generation I/O Controller Hub (ICH9DO) supports a variety of I/O

related functions and PCI devices, including the following:

DMI-to PCI Bridge•

LPC Controller•

SATA Controllers #1 and #2•

Thermal Subsystem•

SMBus Controller•

USB FS/LS UHCI Controllers #1, #2 •

Note: For more information on the ICH9DO, please refer to Intel's website.

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Supermicro C2SBM-Q User Manual Page 15