MSI 845GVM2-V Fiche technique

Intel® 845G/845GL/845GV Chipset DatasheetIntel® 82845G/82845GL/82845GV Graphics and Memory Controller Hub (GMCH)October 2002Document Number: 290746-00

10 Intel® 82845G/82845GL/82845GV GMCH DatasheetRevision HistoryRevision Changes Date-001 Initial release May 2002-002 Added 82845GV information (see

Register Description100 Intel® 82845G/82845GL/82845GV GMCH Datasheet3.5.3.17 INTRPIN—Interrupt Pin Register (Device 2)Address Offset: 3DhDefault Value

Intel® 82845G/82845GL/82845GV GMCH Datasheet 101Register Description3.5.3.21 PMCAP—Power Management Capabilities Register (Device 2)Address Offset: D2

Register Description102 Intel® 82845G/82845GL/82845GV GMCH Datasheet3.5.4 Device 6 RegistersDevice 6 registers are Intel Reserved, except for the foll

Intel® 82845G/82845GL/82845GV GMCH Datasheet 103Register Description3.5.4.2 DRTC—DRAM Read Throttling Control Register (Device 6)Address Offset D8hDe

Register Description104 Intel® 82845G/82845GL/82845GV GMCH DatasheetThis page is intentionally left blank.

Intel® 82845G/82845GL/82845GV GMCH Datasheet 105Functional DescriptionFunctional Description 4This chapter describes the GMCH interfaces and functiona

Functional Description106 Intel® 82845G/82845GL/82845GV GMCH DatasheetWhen the processor or the GMCH drives data, each 16-bit segment is analyzed. If

Intel® 82845G/82845GL/82845GV GMCH Datasheet 107Functional Description4.2 System Memory ControllerThe GMCH can be configured to support either SDR SDR

Functional Description108 Intel® 82845G/82845GL/82845GV GMCH Datasheet4.2.3 Memory Organization and ConfigurationIn the following discussion the term

Intel® 82845G/82845GL/82845GV GMCH Datasheet 109Functional DescriptionMemory Detection and InitializationBefore any cycles to the memory interface can

Intel® 82845G/82845GL/82845GV GMCH Datasheet 11Intel® 82845G GMCH Features Host Interface Support• One processor in a mPGA478 package• Hyper-Threadi

Functional Description110 Intel® 82845G/82845GL/82845GV GMCH Datasheet4.2.5 DRAM Performance DescriptionThe overall memory performance is controlled b

Intel® 82845G/82845GL/82845GV GMCH Datasheet 111Functional Description4.3 AGP InterfaceSee the Accelerated Graphics Port Interface Specification, Revi

Functional Description112 Intel® 82845G/82845GL/82845GV GMCH Datasheet4.3.1.2 AGP Target OperationsAs an initiator, the GMCH does not initiate cycles

Intel® 82845G/82845GL/82845GV GMCH Datasheet 113Functional Description4.3.1.3 AGP Transaction OrderingThe GMCH observes transaction ordering rules as

Functional Description114 Intel® 82845G/82845GL/82845GV GMCH Datasheet4.3.1.6 4X AGP ProtocolIn addition to the 1X and 2X AGP protocol, the GMCH suppo

Intel® 82845G/82845GL/82845GV GMCH Datasheet 115Functional Description4.3.2 PCI Semantic Transactions on AGPThe GMCH accepts and generates PCI semanti

Functional Description116 Intel® 82845G/82845GL/82845GV GMCH DatasheetMemory Read Line, and Memory Read Multiple: These commands are treated identical

Intel® 82845G/82845GL/82845GV GMCH Datasheet 117Functional DescriptionNOTES:1. Processor to AGP/PCI_B bus can result in deadlocks. Locked access to AG

Functional Description118 Intel® 82845G/82845GL/82845GV GMCH DatasheetReads• Read cycle is immediately retried (the GMCH retries the read cycle in thr

Intel® 82845G/82845GL/82845GV GMCH Datasheet 119Functional Description4.4 Integrated Graphics Device (IGD)The GMCH provides a highly integrated graphi

12 Intel® 82845G/82845GL/82845GV GMCH DatasheetThis page is intentionally left blank

Functional Description120 Intel® 82845G/82845GL/82845GV GMCH DatasheetThe entire IGD is fed with data from the memory controller. The performance of t

Intel® 82845G/82845GL/82845GV GMCH Datasheet 121Functional DescriptionZone RenderingZone Rendering Technology is a unique mechanism that addresses mem

Functional Description122 Intel® 82845G/82845GL/82845GV GMCH DatasheetPerspective Correct Texture SupportA textured polygon is generated by mapping a

Intel® 82845G/82845GL/82845GV GMCH Datasheet 123Functional DescriptionGMCH supports 7 types of texture filtering: • Nearest (aka Point Filtering): Tex

Functional Description124 Intel® 82845G/82845GL/82845GV GMCH Datasheet4.4.1.5 Raster EngineThe Raster Engine is where the color data (e.g., fogging, s

Intel® 82845G/82845GL/82845GV GMCH Datasheet 125Functional DescriptionVertex and Per Pixel FoggingFogging is used to create atmospheric effects (e.g.,

Functional Description126 Intel® 82845G/82845GL/82845GV GMCH DatasheetDepth BufferThe Raster Engine can read and write from this buffer and use the da

Intel® 82845G/82845GL/82845GV GMCH Datasheet 127Functional Description4.4.1.7 GMCH VGA RegistersThe 2D registers are a combination of registers define

Functional Description128 Intel® 82845G/82845GL/82845GV GMCH Datasheet4.4.2 Video Engine4.4.2.1 Hardware Motion CompensationThe Motion Compensation (M

Intel® 82845G/82845GL/82845GV GMCH Datasheet 129Functional Description4.4.2.4 Overlay PlaneThe overlay engine provides a method of merging either vide

Intel® 82845G/82845GL/82845GV GMCH Datasheet 13IntroductionIntroduction 1This Graphics and Memory Controller Hub (GMCH) datasheet is for the Intel® 8

Functional Description130 Intel® 82845G/82845GL/82845GV GMCH DatasheetDynamic Bob and WeaveInterlaced data that originates from a video camera creates

Intel® 82845G/82845GL/82845GV GMCH Datasheet 131Functional Description4.5 Display InterfacesThe GMCH has three display ports, one analog and two digit

Functional Description132 Intel® 82845G/82845GL/82845GV GMCH Datasheet4.5.1 Analog Display Port CharacteristicsThe analog display port provides a RGB

Intel® 82845G/82845GL/82845GV GMCH Datasheet 133Functional DescriptionDDC (Display Data Channel)DDC is a standard defined by VESA. Its purpose is to a

Functional Description134 Intel® 82845G/82845GL/82845GV GMCH DatasheetTV-Out CapabilitiesWhile traditional TVs are not digital displays, the GMCH uses

Intel® 82845G/82845GL/82845GV GMCH Datasheet 135Functional DescriptionDDC (Display Data Channel)The multiplexed digital display interface uses the MDV

Functional Description136 Intel® 82845G/82845GL/82845GV GMCH Datasheet4.6 Power and Thermal Management4.6.1 Power Management Support Overview• ACPI Su

Intel® 82845G/82845GL/82845GV GMCH Datasheet 137Functional Description4.6.5 Monitor State Control• D0 (On): In this state, both HSYNC and VSYNC are pu

Functional Description138 Intel® 82845G/82845GL/82845GV GMCH DatasheetFigure 4-2. Intel® 845G Chipset-Based System Clocking DiagramProcessorDPLL24 - 3

Intel® 82845G/82845GL/82845GV GMCH Datasheet 139System AddressSystem Address 5An mPGA478 processor system based on the GMCH supports 4 GB of addressab

Introduction14 Intel® 82845G/82845GL/82845GV GMCH Datasheet1.2 Related Documents NOTE: For additional related documents, refer to the Intel® Pentium®

System Address140 Intel® 82845G/82845GL/82845GV GMCH DatasheetFigure 5-1. Memory System Address MapFigure 5-2. Detailed Memory System Address MapMain

Intel® 82845G/82845GL/82845GV GMCH Datasheet 141System Address5.1.1 Compatibility AreaThis area is divided into the following address regions:• 0 – 64

System Address142 Intel® 82845G/82845GL/82845GV GMCH DatasheetCompatible SMRAM Address Range (A0000h–BFFFFh)When compatible SMM space is enabled, SMM-

Intel® 82845G/82845GL/82845GV GMCH Datasheet 143System Address5.1.2 Extended Memory AreaThis memory area covers 100000h (1 MB) to FFFFFFFFh (4 GB–1 By

System Address144 Intel® 82845G/82845GL/82845GV GMCH DatasheetTable 5-2 details the location and attributes of the regions. Enabling/disabling these r

Intel® 82845G/82845GL/82845GV GMCH Datasheet 145System AddressPCI Memory Address Range (Top of Main Memory to 4 GB)The address range from the top of m

System Address146 Intel® 82845G/82845GL/82845GV GMCH Datasheet5.1.3 AGP Memory Address RangesThe GMCH can be programmed to direct memory accesses to t

Intel® 82845G/82845GL/82845GV GMCH Datasheet 147Electrical CharacteristicsElectrical Characteristics 6This chapter contains the thermal characteristic

Electrical Characteristics148 Intel® 82845G/82845GL/82845GV GMCH Datasheet6.3 Power CharacteristicsNOTES:1. See Intel® 845G/845GL/845GV Chipset: Intel

Intel® 82845G/82845GL/82845GV GMCH Datasheet 149Electrical CharacteristicsHub Interface Signal Groups(e)Hub Interface CMOS I/OHI_[10:0], HISTBS, HISTB

Intel® 82845G/82845GL/82845GV GMCH Datasheet 15Introduction1.3 Intel® 845G Chipset System OverviewFigure 1-1 shows an example block diagram of an 845G

Electrical Characteristics150 Intel® 82845G/82845GL/82845GV GMCH Datasheet6.5 DC ParametersNOTES:1. HA_VREF/HD_VREF and HCC_VREF are generically refer

Intel® 82845G/82845GL/82845GV GMCH Datasheet 151Electrical CharacteristicsTable 6-6. DC Characteristics (Sheet 1 of 2)SymbolSignal GroupParameter Min

Electrical Characteristics152 Intel® 82845G/82845GL/82845GV GMCH DatasheetNOTES:1. Crossing voltage is defined as the instantaneous voltage value when

Intel® 82845G/82845GL/82845GV GMCH Datasheet 153Electrical Characteristics6.6 DAC CharacteristicsThe GMCH DAC (digital-to-analog converter) consists o

Electrical Characteristics154 Intel® 82845G/82845GL/82845GV GMCH Datasheet6.6.2 DAC Reference and Output SpecificationsNOTES:1. VESA Video Signal Stan

Intel® 82845G/82845GL/82845GV GMCH Datasheet 155Ballout and Package InformationBallout and Package Information 7This chapter provides the ballout list

Ballout and Package Information156 Intel® 82845G/82845GL/82845GV GMCH DatasheetFigure 7-1. Intel® 82845G GMCH Ballout Footprint (Top View – Left Side)

Intel® 82845G/82845GL/82845GV GMCH Datasheet 157Ballout and Package InformationFigure 7-2. Intel® 82845G GMCH Ballout Footprint (Top View – Right Side

Ballout and Package Information158 Intel® 82845G/82845GL/82845GV GMCH DatasheetTable 7-1. Intel® 82845G GMCH Ballout by Ball NumberBall # Signal NameA

Ballout and Package InformationIntel® 82845G/82845GL/82845GV GMCH Datasheet 159E2 GSBA_5E3 VSSE4 GSBA_4E5 GSBSTB#E7 PWROKE9 VCCE11 VCCE13 VSSE15 GREEN

Introduction16 Intel® 82845G/82845GL/82845GV GMCH DatasheetFigure 1-1. Intel® 845G Chipset System Block DiagramIntel® 82801DBI/O Controller Hub 4(ICH

Ballout and Package Information160 Intel® 82845G/82845GL/82845GV GMCH DatasheetL2 AGP_RCOMPL3 VSSL4 GAD_22L5 GAD_21L7 GADSTB_1#L9 VCCAGPL29 VSSL31 HDS

Ballout and Package InformationIntel® 82845G/82845GL/82845GV GMCH Datasheet 161W36 VSSY2 MEM_SELY3 PSB_SELY4 RSVDY6 VSSY8 RSVDY10 VSSY17 VSSY18 VSSY19

Ballout and Package Information162 Intel® 82845G/82845GL/82845GV GMCH DatasheetAH28 VSSAH30 VSSAH32 VSSAH34 NCAH35 HA_29#AH36 VSSAJ1 VCCSMAJ2 VCCSMAJ3

Ballout and Package InformationIntel® 82845G/82845GL/82845GV GMCH Datasheet 163AP16 SDQ_25AP17 SMAA_7AP18 SDQ_30AP19 SMAA_6AP20 VCCSMAP21 SCMDCLK_3AP2

Ballout and Package Information164 Intel® 82845G/82845GL/82845GV GMCH DatasheetTable 7-2. Intel® 82845G GMCH Ballout by Signal NameSignal Name Ball #A

Ballout and Package InformationIntel® 82845G/82845GL/82845GV GMCH Datasheet 165HD_8# J36HD_9# K34HD_10# K36HD_11# M30HD_12# M35HD_13# L34HD_14# K35HD_

Ballout and Package Information166 Intel® 82845G/82845GL/82845GV GMCH DatasheetSBA_1 AP27SCAS# AN29SCKE_0 AP13SCKE_1 AN13SCKE_2 AK14SCKE_3 AL13SCMDCLK

Ballout and Package InformationIntel® 82845G/82845GL/82845GV GMCH Datasheet 167VCC B9VCC B10VCC B11VCC B12VCC C9VCC C10VCC C11VCC C12VCC D9VCC D10VCC

Ballout and Package Information168 Intel® 82845G/82845GL/82845GV GMCH DatasheetVSS A5VSS A21VSS A23VSS A25VSS A27VSS A29VSS A33VSS A35VSS B2VSS B8VSS

Ballout and Package InformationIntel® 82845G/82845GL/82845GV GMCH Datasheet 169VSS AC29VSS AC35VSS AD32VSS AE1VSS AE9VSS AE29VSS AE35VSS AE37VSS AF6VS

Intel® 82845G/82845GL/82845GV GMCH Datasheet 17Introduction1.4 Intel® 82845G GMCH OverviewThe GMCH provides the processor interface, SDRAM interface,

Ballout and Package Information170 Intel® 82845G/82845GL/82845GV GMCH Datasheet7.2 Package InformationThe GMCH is in a 37.5 mm x 37.5 mm FC-BGA packag

Intel® 82845G/82845GL/82845GV GMCH Datasheet 171Ballout and Package InformationFigure 7-4. Intel® 82845G GMCH Package Dimensions (Bottom View)Pk 760 B

Ballout and Package Information172 Intel® 82845G/82845GL/82845GV GMCH DatasheetThis page is intentionally left blank.

Intel® 82845G/82845GL/82845GV GMCH Datasheet 173TestabilityTestability 8In the GMCH, testability for Automated Test Equipment (ATE) board level testin

Testability174 Intel® 82845G/82845GL/82845GV GMCH DatasheetTable 8-2. XOR Chains 0, 1, and 2 (Sheet 1 of 2)XOR Chain 0(42 inputs)Output pins: SMAA_0,

Testability175 Intel® 82845G/82845GL/82845GV GMCH DatasheetGSTOP# P2GFRAME# M4GDEVSEL# N2GTRDY# N5GWBF# G5GC/BE_2# M2GC/BE_3# H2GSBSTB F4Output PinsSM

Testability176 Intel® 82845G/82845GL/82845GV GMCH DatasheetTable 8-3. XOR Chains 3, 4, and 5 (Sheet 1 of 2)XOR Chain 3(44 inputs)Output pins: SMAA_3,

Intel® 82845G/82845GL/82845GV GMCH Datasheet 177TestabilityCPURST# D22 HD_4# R31 SDQ_33 AP22HD_39# D31 HD_0# T30 SDQ_32 AR22HD_33# D30 HD_2# R34 SDQ_3

Testability178 Intel® 82845G/82845GL/82845GV GMCH DatasheetTable 8-4. XOR Chains 6, 7, and 8 (Sheet 1 of 2)XOR Chain 6(20 inputs)Output pins: SMAA_6,

Intel® 82845G/82845GL/82845GV GMCH Datasheet 179TestabilitySDQ_2 AT3SDQ_1 AP2Output PinsSRAS# AK28SCAS# AN29Table 8-4. XOR Chains 6, 7, and 8 (Sheet 2

Introduction18 Intel® 82845G/82845GL/82845GV GMCH Datasheet1.4.4 Multiplexed AGP and Intel® DVO Port InterfaceThe GMCH multiplexes an AGP interface wi

Testability180 Intel® 82845G/82845GL/82845GV GMCH Datasheet8.3 XOR Chains Excluded PinsTable 8-5 lists the signals that are excluded from the XOR chai

Intel® 82845G/82845GL/82845GV GMCH Datasheet 181Intel® 82845GL/82845GV GMCHIntel® 82845GL/82845GV GMCH 9Chapter 1 through Chapter 8 of this datasheet

Intel® 82845G/82845GL/82845GV GMCH Datasheet 182Intel® 82845GL/82845GV GMCH9.2 No AGP Interface The 82845GL and 82845GV do not have an AGP interface.

Intel® 82845G/82845GL/82845GV GMCH Datasheet 183Intel® 82845GL/82845GV GMCH9.4 Intel® 82845G and Intel® 82845GL/82845GV Register DifferencesChapter 3

Intel® 82845GL/82845GV GMCH184 Intel® 82845G/82845GL/82845GV GMCH DatasheetATTBASE — Aperture Translation Table Register (Device 0)Address Offset B8–

Intel® 82845G/82845GL/82845GV GMCH Datasheet 185Intel® 82845GL/82845GV GMCHGMCHCFG—GMCH Configuration Register (Device 0)Address Offset C6–C7hDefault

Intel® 82845G/82845GL/82845GV GMCH Datasheet 186Intel® 82845GL/82845GV GMCHCAPREG—Capability Identification Register (Device 0)Address Offset E4h–E8h

Intel® 82845GL/82845GV GMCHIntel® 82845G/82845GL/82845GV GMCH Datasheet 187Table 9-1. Intel® 82845GL/82845GV Ballout by Signal NameSignal Name Ball#AD

Intel® 82845GL/82845GV GMCH188 Intel® 82845G/82845GL/82845GV GMCH DatasheetHD_0# T30HD_1# R33HD_2# R34HD_3# N34HD_4# R31HD_5# L33HD_6# L36HD_7# P35HD_

Intel® 82845GL/82845GV GMCHIntel® 82845G/82845GL/82845GV GMCH Datasheet 189NC AJ35NC AT1NC AT37NC AU1NC AU2NC AU36NC AU37NC B5NC H8NC G7NC D5NC F4NC E

Intel® 82845G/82845GL/82845GV GMCH Datasheet 19IntroductionThe graphics features on the GMCH include:1.4.6 Display InterfacesThe GMCH provides interfa

Intel® 82845GL/82845GV GMCH190 Intel® 82845G/82845GL/82845GV GMCH DatasheetSDQ_45 AR28SDQ_46 AT30SDQ_47 AT31SDQ_48 AR32SDQ_49 AT32SDQ_50 AR36SDQ_51 AP

Intel® 82845GL/82845GV GMCHIntel® 82845G/82845GL/82845GV GMCH Datasheet 191VCCAGP P6VCCAGP P10VCCAGP R1VCCAGP R9VCCAGP V6VCCAGP V10VCCAGP W9VCCAGP AB1

Intel® 82845GL/82845GV GMCH192 Intel® 82845G/82845GL/82845GV GMCH DatasheetVSS E35VSS E37VSS F6VSS F8VSS F14VSS F22VSS F24VSS F26VSS F28VSS F30VSS F32

Intel® 82845GL/82845GV GMCHIntel® 82845G/82845GL/82845GV GMCH Datasheet 193VSS AH28VSS AH30VSS AH32VSS AH36VSS AJ13VSS AJ17VSS AJ21VSS AJ25VSS AJ29VSS

2 Intel® 82845G/82845GL/82845GV GMCH DatasheetINFORMATION IN THIS DOCUMENT IS PROVIDED IN CONNECTION WITH INTEL® PRODUCTS. NO LICENSE, EXPRESS OR IMP

Introduction20 Intel® 82845G/82845GL/82845GV GMCH DatasheetThis page is intentionally left blank.

Intel® 82845G/82845GL/82845GV GMCH Datasheet 21Signal DescriptionSignal Description 2This section provides a detailed description of GMCH signals. The

Signal Description22 Intel® 82845G/82845GL/82845GV GMCH DatasheetFigure 2-1. Intel® 82845G GMCH Interface Block DiagramSCS_[3:0]#SMAA_[12:0], SMAB_[5,

Intel® 82845G/82845GL/82845GV GMCH Datasheet 23Signal Description2.1 Host Interface SignalsSignal Name Type DescriptionADS# I/O AGTL+Address Strobe: T

Signal Description24 Intel® 82845G/82845GL/82845GV GMCH DatasheetHDSTB_P[3:0]#HDSTB_N[3:0]#I/O AGTL+ Differential Host Data Strobes: HDSTB_P[3:0]# and

Intel® 82845G/82845GL/82845GV GMCH Datasheet 25Signal Description2.2 Memory Interface2.2.1 DDR SDRAM InterfaceSignal Name Type DescriptionSCMDCLK_[5:0

Signal Description26 Intel® 82845G/82845GL/82845GV GMCH Datasheet2.2.2 SDR SDRAM InterfaceThe SDR interface signals are multiplexed with the DDR signa

Intel® 82845G/82845GL/82845GV GMCH Datasheet 27Signal DescriptionSRAS# SCKE_0 AK28 SDQ_3 SDQ_4 AP5SCS_2# SCS_3# AK30 SDQ_13 SDQ_6 AP6SDQ_63 SDQ_31 AK3

Signal Description28 Intel® 82845G/82845GL/82845GV GMCH Datasheet2.3 Hub InterfaceSCKE_0 Reserved AP13 SDQS_5 Reserved AP29SDQ_23 SDQ_45 AP14 SDQ_2 SD

Intel® 82845G/82845GL/82845GV GMCH Datasheet 29Signal Description2.4 AGP Interface Signals2.4.1 AGP Addressing SignalsNote: The above table contains t

Intel® 82845G/82845GL/82845GV GMCH Datasheet 3Contents1 Introduction...

Signal Description30 Intel® 82845G/82845GL/82845GV GMCH Datasheet2.4.3 AGP Status Signals2.4.4 AGP StrobesSignal Name Type DescriptionGST_[2:0] OAGPSt

Intel® 82845G/82845GL/82845GV GMCH Datasheet 31Signal Description2.4.5 PCI Signals–AGP SemanticsPCI signals are redefined when used in AGP transaction

Signal Description32 Intel® 82845G/82845GL/82845GV GMCH Datasheet2.4.6 PCI Pins during PCI Transactions on AGP InterfaceThe PCI signals described in S

Intel® 82845G/82845GL/82845GV GMCH Datasheet 33Signal DescriptionDVOBC_INTR#IAGPDVOBC Interrupt: This signal may be used as an interrupt input for eit

Signal Description34 Intel® 82845G/82845GL/82845GV GMCH Datasheet2.5.1 Intel® DVO Signal Name to AGP Signal Name Pin MappingThe 82845G GMCH multiplexe

Intel® 82845G/82845GL/82845GV GMCH Datasheet 35Signal Description2.6 Analog DisplaySignal Name Type DescriptionHSYNCO3.3 V GPIOCRT Horizontal Synchron

Signal Description36 Intel® 82845G/82845GL/82845GV GMCH Datasheet2.7 Clocks, Reset, and Miscellaneous Signals2.8 RCOMP, VREF, VSWING SignalsSignal Nam

Intel® 82845G/82845GL/82845GV GMCH Datasheet 37Signal DescriptionTable 2-2 shows the VTT/VDD, VREF, RCOMP, and VSWING levels for the various interface

Signal Description38 Intel® 82845G/82845GL/82845GV GMCH Datasheet2.10 Functional Straps2.11 GMCH Sequencing RequirementsPower Plane and Sequencing Req

Intel® 82845G/82845GL/82845GV GMCH Datasheet 39Signal Description2.12 Reset States 2.12.1 Full and Warm Reset StatesAll register bits assume their def

4 Intel® 82845G/82845GL/82845GV GMCH Datasheet3.5.1 DRAM Controller/Host-Hub Interface Device Registers (Device 0) .. 483.5.1.1 VID—Vendor Identifica

Signal Description40 Intel® 82845G/82845GL/82845GV GMCH DatasheetThis page is intentionally left blank.

Intel® 82845G/82845GL/82845GV GMCH Datasheet 41Register DescriptionRegister Description 3This chapter describes the platform device PCI configuration

Register Description42 Intel® 82845G/82845GL/82845GV GMCH Datasheet3.2 Platform ConfigurationIn some previous chipsets the MCH (or GMCH) component and

Intel® 82845G/82845GL/82845GV GMCH Datasheet 43Register DescriptionLogically, the ICH4 appears as multiple PCI devices within a single physical compon

Register Description44 Intel® 82845G/82845GL/82845GV GMCH Datasheet3.3.1 Standard PCI Bus Configuration MechanismThe PCI Local Bus Specification, Revi

Intel® 82845G/82845GL/82845GV GMCH Datasheet 45Register Descriptionhave a Bus Number that matches the Secondary Bus Number of the GMCH’s “virtual” Hos

Register Description46 Intel® 82845G/82845GL/82845GV GMCH DatasheetTo prepare for mapping of the configuration cycles on AGP/PCI_B, the initialization

Intel® 82845G/82845GL/82845GV GMCH Datasheet 47Register Description3.4.2 CONFIG_DATA—Configuration Data RegisterI/O Address: 0CFChDefault Value: 00000

Register Description48 Intel® 82845G/82845GL/82845GV GMCH Datasheet3.5 Intel® GMCH Internal Device Registers3.5.1 DRAM Controller/Host-Hub Interface D

Intel® 82845G/82845GL/82845GV GMCH Datasheet 49Register Description90–96h PAM[0:6] Programmable Attribute Map 00h RO, R/W97h FDHC Fixed SDRAM Hole Con

Intel® 82845G/82845GL/82845GV GMCH Datasheet 53.5.2.9 HDR1—Header Type Register (Device 1)...833.5.2.10 PBUSN1—Primary Bus Numb

Register Description50 Intel® 82845G/82845GL/82845GV GMCH Datasheet3.5.1.1 VID—Vendor Identification Register (Device 0)Address Offset: 00–01hDefault

Intel® 82845G/82845GL/82845GV GMCH Datasheet 51Register Description3.5.1.3 PCICMD—PCI Command Register (Device 0)Address Offset: 04–05hDefault Value:

Register Description52 Intel® 82845G/82845GL/82845GV GMCH Datasheet3.5.1.4 PCISTS—PCI Status Register (Device 0)Address Offset: 06–07hDefault Value: 0

Intel® 82845G/82845GL/82845GV GMCH Datasheet 53Register Description3.5.1.5 RID—Revision Identification Register (Device 0)Address Offset: 08hDefault V

Register Description54 Intel® 82845G/82845GL/82845GV GMCH Datasheet3.5.1.8 MLT—Master Latency Timer Register (Device 0)Address Offset: 0DhDefault Valu

Intel® 82845G/82845GL/82845GV GMCH Datasheet 55Register Description3.5.1.10 APBASE—Aperture Base Configuration Register (Device 0)Address Offset: 10–1

Register Description56 Intel® 82845G/82845GL/82845GV GMCH Datasheet3.5.1.11 SVID—Subsystem Vendor Identification Register (Device 0)Address Offset: 2C

Intel® 82845G/82845GL/82845GV GMCH Datasheet 57Register Description3.5.1.14 AGPM—AGP Miscellaneous Configuration Register (Device 0)Address Offset: 51

Register Description58 Intel® 82845G/82845GL/82845GV GMCH Datasheet3.5.1.15 GC—Graphics Control Register (Device 0) Address Offset: 52hDefault Value:

Intel® 82845G/82845GL/82845GV GMCH Datasheet 59Register DescriptionNotes on Pre-Allocated Memory for GraphicsThese Register Bits control the allocatio

6 Intel® 82845G/82845GL/82845GV GMCH Datasheet4.1.1 PSB Dynamic Bus Inversion... 1054.1.2 Sys

Register Description60 Intel® 82845G/82845GL/82845GV GMCH Datasheet3.5.1.16 DRB[0:3]—DRAM Row Boundary Register (Device 0)Address Offset: 60–63h (64h–

Intel® 82845G/82845GL/82845GV GMCH Datasheet 61Register Description3.5.1.17 DRA—DRAM Row Attribute Register (Device 0)Address Offset: 70–71h (72–77h R

Register Description62 Intel® 82845G/82845GL/82845GV GMCH Datasheet3.5.1.18 DRT—DRAM Timing Register (Device 0)Address Offset: 78–7BhDefault Value: 00

Intel® 82845G/82845GL/82845GV GMCH Datasheet 63Register Description3.5.1.19 DRC—DRAM Controller Mode Register (Device 0)Address Offset: 7C–7FhDefault

Register Description64 Intel® 82845G/82845GL/82845GV GMCH Datasheet3.5.1.20 PAM[0:6]—Programmable Attribute Map Registers (Device 0)Address Offset: 90

Intel® 82845G/82845GL/82845GV GMCH Datasheet 65Register DescriptionAt the time that a hub interface or AGP accesses to the PAM region may occur, the t

Register Description66 Intel® 82845G/82845GL/82845GV GMCH DatasheetMicrosoft MS-DOS* Application Area (00000h–9FFFh)The MS-DOS* area is 640 KB in size

Intel® 82845G/82845GL/82845GV GMCH Datasheet 67Register Description3.5.1.21 FDHC—Fixed SDRAM Hole Control Register (Device 0)Address Offset: 97hDefaul

Register Description68 Intel® 82845G/82845GL/82845GV GMCH Datasheet3.5.1.23 ESMRAMC—Extended System Management RAM Control Register (Device 0)Address

Intel® 82845G/82845GL/82845GV GMCH Datasheet 69Register Description3.5.1.24 ACAPID—AGP Capability Identifier Register (Device 0)Address Offset: A0–A3h

Intel® 82845G/82845GL/82845GV GMCH Datasheet 75 System Address ...

Register Description70 Intel® 82845G/82845GL/82845GV GMCH Datasheet3.5.1.26 AGPCMD—AGP Command Register (Device 0)Address Offset: A8–ABhDefault Value:

Intel® 82845G/82845GL/82845GV GMCH Datasheet 71Register Description3.5.1.28 APSIZE—Aperture Size Register (Device 0)Address Offset: B4hDefault Value:

Register Description72 Intel® 82845G/82845GL/82845GV GMCH Datasheet3.5.1.30 AMTT—AGP MTT Control Register (Device 0)Address Offset: BChDefault Value:

Intel® 82845G/82845GL/82845GV GMCH Datasheet 73Register Description3.5.1.32 GMCHCFG—GMCH Configuration Register (Device 0)Address Offset: C6–C7hDefaul

Register Description74 Intel® 82845G/82845GL/82845GV GMCH Datasheet3.5.1.33 ERRSTS—Error Status Register (Device 0)Address Offset: C8–C9hDefault Value

Intel® 82845G/82845GL/82845GV GMCH Datasheet 75Register Description3.5.1.34 ERRCMD—Error Command Register (Device 0)Address Offset: CA–CBhDefault Valu

Register Description76 Intel® 82845G/82845GL/82845GV GMCH Datasheet3.5.1.35 SMICMD—SMI Command Register (Device 0)Address Offset: CC–CDhDefault Value:

Intel® 82845G/82845GL/82845GV GMCH Datasheet 77Register Description3.5.1.38 CAPREG—Capability Identification Register (Device 0)Address Offset: E4h–E8

Register Description78 Intel® 82845G/82845GL/82845GV GMCH Datasheet3.5.2 Host-to-AGP Bridge Registers (Device 1)The host-to-AGP Bridge (virtual PCI-to

Intel® 82845G/82845GL/82845GV GMCH Datasheet 79Register Description3.5.2.1 VID1—Vendor Identification Register (Device 1)Address Offset: 00–01hDefault

8 Intel® 82845G/82845GL/82845GV GMCH DatasheetFigures1-1 Intel® 845G Chipset System Block Diagram... 1

Register Description80 Intel® 82845G/82845GL/82845GV GMCH Datasheet3.5.2.3 PCICMD1—PCI Command Register (Device 1)Address Offset: 04–05hDefault Value:

Intel® 82845G/82845GL/82845GV GMCH Datasheet 81Register Description3.5.2.4 PCISTS1—PCI Status Register (Device 1)Address Offset: 06–07hDefault Value:

Register Description82 Intel® 82845G/82845GL/82845GV GMCH Datasheet3.5.2.5 RID1—Revision Identification Register (Device 1)Address Offset: 08hDefault

Intel® 82845G/82845GL/82845GV GMCH Datasheet 83Register Description3.5.2.8 MLT1—Master Latency Timer Register (Device 1)Address Offset: 0DhDefault Val

Register Description84 Intel® 82845G/82845GL/82845GV GMCH Datasheet3.5.2.11 SBUSN1—Secondary Bus Number Register (Device 1)Address Offset: 19hDefault

Intel® 82845G/82845GL/82845GV GMCH Datasheet 85Register Description3.5.2.14 IOBASE1—I/O Base Address Register (Device 1)Address Offset: 1ChDefault Val

Register Description86 Intel® 82845G/82845GL/82845GV GMCH Datasheet3.5.2.16 SSTS1—Secondary Status Register (Device 1)Address Offset: 1EhDefault Value

Intel® 82845G/82845GL/82845GV GMCH Datasheet 87Register Description3.5.2.17 MBASE1—Memory Base Address Register (Device 1)Address Offset: 20–21hDefaul

Register Description88 Intel® 82845G/82845GL/82845GV GMCH Datasheet3.5.2.18 MLIMIT1—Memory Limit Address Register (Device 1)Address Offset: 22–23hDefa

Intel® 82845G/82845GL/82845GV GMCH Datasheet 89Register Description3.5.2.19 PMBASE1—Prefetchable Memory Base Address Register (Device 1)Address Offset

Intel® 82845G/82845GL/82845GV GMCH Datasheet 9Tables2-1 DDR-to-SDR Signal Mapping ...

Register Description90 Intel® 82845G/82845GL/82845GV GMCH Datasheet3.5.2.21 BCTRL1—Bridge Control Register (Device 1)Address Offset: 3EhDefault Value:

Intel® 82845G/82845GL/82845GV GMCH Datasheet 91Register DescriptionThe bit field definitions for VGAEN and MDAP are detailed in Table 3-4. 3.5.2.22 ER

Register Description92 Intel® 82845G/82845GL/82845GV GMCH Datasheet3.5.3 Integrated Graphics Device Registers (Device 2)The Integrated Graphics Device

Intel® 82845G/82845GL/82845GV GMCH Datasheet 93Register Description3.5.3.1 VID2—Vendor Identification Register (Device 2)Address Offset: 00h−01hDefaul

Register Description94 Intel® 82845G/82845GL/82845GV GMCH Datasheet3.5.3.3 PCICMD2—PCI Command Register (Device 2)Address Offset: 04h−05hDefault: 0000

Intel® 82845G/82845GL/82845GV GMCH Datasheet 95Register Description3.5.3.4 PCISTS2—PCI Status Register (Device 2)Address Offset: 06h−07hDefault Value:

Register Description96 Intel® 82845G/82845GL/82845GV GMCH Datasheet3.5.3.6 CC—Class Code Register (Device 2)Address Offset: 09h−0BhDefault Value: 0300

Intel® 82845G/82845GL/82845GV GMCH Datasheet 97Register Description3.5.3.9 HDR2—Header Type Register (Device 2)Address Offset: 0EhDefault Value: 00hAc

Register Description98 Intel® 82845G/82845GL/82845GV GMCH Datasheet3.5.3.11 MMADR—Memory Mapped Range Address Register (Device 2)Address Offset: 14– 1

Intel® 82845G/82845GL/82845GV GMCH Datasheet 99Register Description3.5.3.14 ROMADR—Video BIOS ROM Base Address Registers (Device 2)Address Offset: 30–