GGC Gmch Graphics Control Register Device #0 | Intel D15343-003

Register Description

4.8.14GGC – GMCH Graphics Control Register (Device #0)

Address Offset:		52-53h
Default Value:		0030h
Access:		Read/Write
Size:		16 bits

Bit	Descriptions

15:7	Reserved

6:4	Graphics Mode Select (GMS): This field is used to select the amount of Main system memory
	that is pre-allocated to support the Internal Graphics Device in VGA (non-linear) and Native (linear)
	modes. The BIOS ensures that system memory is pre-allocated only when Internal Graphics is
	enabled.
	000: No system memory pre-allocated. Device #2 (IGD) does not claim VGA cycles (Memory and
	I/O), and the Sub-Class Code field within Device #2 Function #0 Class Code register is 80.
	001: DVMT (UMA) mode, 1 MB of system memory pre-allocated for frame buffer.
	010: DVMT (UMA) mode, 4 MB of system memory pre-allocated for frame buffer.
	011: DVMT (UMA) mode, 8 MB of system memory pre-allocated for frame buffer.
	100: DVMT (UMA) mode, 16 MB of system memory pre-allocated for frame buffer.
	101: DVMT (UMA) mode, 32 MB of system memory pre-allocated for frame buffer.
	All other combinations reserved.

3	Reserved

2	Device #2 Function #1 Enable/Disable:
	1: Disable Function #1 within Device #2.
	0: Enable Function #1 within Device #2.

1	IGD VGA Disable (IVD): VGA can only be enabled in Naytive Graphics Mode. If strapped in other
	mode, this bit	should always set to 1.
	1: Disable. Device #2 (IGD) does not claim VGA Memory and I/O Mem cycles, and the Sub-Class
	Code field within Device #2 Function #0 Class Code register is 80.
	0: Enable. Device #2 (IGD) claims VGA Memory and I/O cycles, the Sub-Class Code within Device
	#2 Class Code register is 00.

0	Reserved

D15343-003

59

Image 59

Intel D15343-003 manual GGC Gmch Graphics Control Register Device #0, Bit, Reserved Device #2 Function #1 Enable/Disable

Contents

Intel 82854 Graphics Memory Controller Hub Gmch Datasheet D15343-003 Contents Intel 82854 Graphics Memory Controller Hub Gmch 10.9 127 Figures 152 Date Revision Description Revision History Intel 82854 Graphics Memory Controller Hub Gmch Memory System OverviewProcessor/Host Bus Support Video Overlay System InterruptsVideo Stream Decoder Display Internal Graphics Features Intel 82854 Graphics Memory Controller Hub Gmch Hub Interface to ICH4-M Graphic Power ManagementPower Management Package Intel 854 Chipset system block diagram Native Graphic mode Term Description TerminologyTerms and Descriptions ICH4-M Document Location Reference DocumentsReference Documents Intel 82854 Graphics Memory Controller Hub Gmch Intel 82854 Gmch System Architecture Technology Width Processor Host InterfaceGmch System Memory Interface DDR Sdram Memory Capacity Gmch Integrated DVO Ports Graphics FeaturesDisplay Features Gmch Analog Display Port Address Decode Policies Hub Interface Bytes MB/s Gmch ClockingIntel 82854 Gmch Interface Clocks Ratio System Interrupts Buffer Description Notation Description Host Interface Signal Descriptions Host Interface Signals HLOCK# DRDY#HIT# HITM# RS20# Response type RS20# SCAS# DDR Sdram InterfaceDDR Sdram Interface Descriptions SRAS# Hub Interface Signals Hub Interface Signals Clocks Drefclk Display Power Management Signaling This signal is used onlyDpms DAC Clocking Digital Video Output B Dvob Port Internal Graphics Display SignalsDigital Video Output B Dvob Port Signal Descriptions Digital Video Output C Dvoc Port Digital Video Output C Dvoc Port Signal Descriptions Analog CRT Display Dvob and Dvoc Port Common Signal DescriptionsAnalog CRT Display Signal Descriptions Gpio Signal Descriptions General Purpose Input/Output Signals Voltage References, PLL Power Voltage References, PLL Power Vcchl HlrcompPswing Hlvref Gmch Function Bus #0, Device# Conceptual Overview of the Platform Configuration StructureDevice Number Assignment Nomenclature for Access Attributes Nomenclature for Access Attributes PCI Bus #0 Configuration Mechanism Standard PCI Bus Configuration MechanismRouting Configuration Accesses Reserved Bits Primary PCI and Downstream Configuration MechanismDefault Value upon Reset Register Definitions I/O Mapped Registers Configaddress Configuration Address Register Reserved Bit Descriptions Configuration Data Register Configdata Configuration Data Register Name Function Read @ Write @ VGA I/O Mapped RegistersVGA I/O Mapped Register List Index Data Registers End Gmch Configuration Space Device #0, Function#0Register Name Default Value Access Attbase Bit Descriptions 150 VID Vendor Identification RegisterDid Device Identification Register = Serr message is not generated by the Gmch for Device #0 Pcicmd PCI Command Register PCI Status Register Subc Sub Class Code Register RID Register Identification Svid Subsystem Vendor Identification Register BCC Base Class Code RegisterHDR Header Type Register Capptr Capabilities Pointer Register SID Subsystem Identification Register Capability ID Capid Capabilities Identification Register Device #0 VGA Rrbar Access Enable-R/WGMC Gmch Miscellaneous Control Register Device #0 MDA Present MDAP-R/W Bit Reserved Device #2 Function #1 Enable/DisableGGC Gmch Graphics Control Register Device #0 Bit Description Dafc Device and Function Control Register Device #0Fdhc Fixed Dram Hold Control Register Device #0 Bits 7 Bits 6 Bits 5 Bits 4 Description Reserved 17 PAM60 Programmable Attribute Map Register Device #0Attribute Bit Assignment PAM Registers Expansion Area C0000h-DFFFFh PAM Registers and Associated System Memory SegmentsDOS Application Area 00000h-9FFFh Video Buffer Area A0000h-BFFFFh Smram System Management RAM Control Register Device #0 Extended System Bios Area E0000h-EFFFFhSystem Bios Area F0000h-FFFFFh Esmramc Extended System Management RAM Control Device #0 Errsts Error Status Register Device #0 Errcmd Error Command Register Device #0 Bit Description Reserved Smicmd SMI Error Command Register Device #0 SCI on Gmch Thermal Sensor Trip Scicmd SCI Error Command Register Device #0Reserved SCI on Multiple-bit ECC Error SCI on Single-bit ECC Error Shic Secondary Host Interface Control Register Device #0 Reserved On Die Termination ODT Gating DisableReserved FSB Data Bus Power Management Control C2 state Gmch FSB Interface Power Management Control HEM Host Error Control, Status, and Observation Device #0 DRB VID Vendor Identification Register Pcicmd PCI Command Register Pcists PCI Status Register RID Revision Identification Register Device. Reads and Writes to this location have no effect DRB Dram Row 03 Boundary Register Device #0 DRA Dram Row Attribute Register Device #0 Examples of usage DDR Internal Write to Read Command delay tWTRDDR Write Recovery time tWR DRT Dram Timing Register Device #0 Refresh Cycle Time tRFC Encoding CK between RD and WR commandsBack To Back Read-Read commands spacing DDR, different Rows Encoding CK between RD and RD commands Reserved CAS# Latency tCL Activate to Precharge delay tRAS, MAXActivate to Precharge delay tRAS, MIN Rcven DLL shutdown disable PCEn Page Close Enable TC Timer Control PDEn23CS# Signal Drive Control Dynamic Memory Interface Power Management Power State S1/S3 Refresh Control Ddim DDR Sdram Data Integrity Mode DRC Dram Controller Mode Register Device #0 011 000001 010 For Double Data Rate DTC Dram Throttling Control Register Device #0 Wttc DDR Sdram Throttle Mode Tmode 2724 High Priority Stream Throttling Enable Thermal Power Throttle Control fields Enable Hpllcc Did Device Identification Register Pcicmd PCI Command Register Pcists PCI Status Register Subc Sub-Class Code Register ID Subsystem Identification Register Hpll VCO Change Sequence Initiate Bit Hpllcc Hpll Clock Control Register Device #0 Rate Straps Read GFX CoreHPLLCC20 DVO Port CRT Port Regs Register Name Did Device Identification Register Device #2 VID Vendor Identification Register Device #2 Pcicmd PCI Command Register Device #2 RID Revision Identification Register Device #2 Pcists PCI Status Register Device #2 Base Class Code Basec 03=Display controller MLT Master Latency Timer Register Device #2CC Class Code Register Device #2 CLS Cache Line Size Register Device #2 Gmadr Graphics Memory Range Address Register Device #2 Bit Description Master Latency Timer Count Value ROPrefetchable Memory-RO Enable prefetching HDR Header Type Register Device #2 Memory / IO Space-RO Mmadr Memory Mapped Range Address Register Device #2Iobar I/O Base Address Register Device #2 Prefetchable Memory-RO Prevents prefetching SID Subsystem Identification Register Device #2 Romadr Video Bios ROM Base Address Registers Device #2Svid Subsystem Vendor Identification Register Device #2 Mingnt Minimum Grant Register Device #2 Intrline Interrupt Line Register Device #2Intrpin Interrupt Pin Register Device #2 Maxlat Maximum Latency Register Device #2 Pmcap Power Management Capabilities Register Device #2Auxiliary Power Source Hardwired to Bits10 Power State Pmcs Power Management Control/Status Register Device #2 Simplified View of System Address Map System Memory Address Ranges Detailed View of System Address Map DOS Compatibility Area Compatible Smram Address Range 0A0000h-0BFFFFh System Memory Segments and Their AttributesDOS Area 000000h-09FFFFh Legacy VGA Ranges 0A0000h-0BFFFFh Monochrome Display Adapter MDA Range 0B0000h 0B7FFFh Extended System Bios Area 0E0000h-0EFFFFhSystem Bios Area 0F0000h-0FFFFFh Extended System Memory Area Attributes Comments 1 15 MB-16 MB WindowPre-allocated System Memory Pre-allocated System Memory Dynamic Video Memory Technology Dvmt Extended Smram Address Range Hseg and TsegHseg Tseg PCI Memory Address Range Top of Main System Memory to 4 GB High Bios Area FFE00000h -FFFFFFFFh SMM Space Definition System Management Mode SMM Memory RangeSMM Space Restrictions SMM Space Transaction Handling System Memory Shadowing5 I/O Address Space PCI I/O Address Mapping Gmch Decode Rules and Cross-Bridge Address Mapping Hub Interface Decode Rules Hub Interface Accesses to Gmch that Cross Device Boundaries Interface Decode Rules Cycles Initiated Using PCI ProtocolAccesses to Gmch that Cross Device Boundaries Relation of DBI Bits to Data Bits Host Interface OverviewDynamic Bus Inversion System Bus Interrupt Delivery Upstream Interrupt Messages System Memory Organization and ConfigurationConfiguration Mechanism for DDR DIMMs System Memory Interface Byte Function DDR Sdram Performance DescriptionSystem Memory Register Programming Data Bytes on DDR Dimm Used for Programming Dram Registers 1 3D/2D Instruction Processing Integrated Graphics Overview 2.3 3D Primitives and Data Formats Support Setup Engine2 3D Engine Viewport Transform and Perspective Divide Perspective Correct Texture Support Backface CullingScan Converter Texture Engine Texture Map Filtering Texture ChromakeyAnti-Aliasing Bump Mapping Raster EngineMultiple Texture Composition Cubic Environment Mapping Color Dithering Texture Map BlendingCombining Intrinsic and Specular Color Components Color Shading Modes Depth Buffer Alpha BlendingColor Buffer Formats Destination Alpha 4.1 256-Bit Pattern Fill and BLT Engine 4 2D EngineStencil Buffer Projective Textures Alpha Stretch BLT Hardware Cursor Plane Native Graphic Mode onlyDual Display Usage Model Native Graphic Mode only Planes and Engines Overlay Plane Dynamic Bob and Weave Color Control Sub-picture Support Video FunctionalityMPEG-2 Decoding Hardware Motion Compensation Pipe a Timing Generator Unit Internal Graphic Display Interface Arib Support 1.2 H, V timing signals for active and blank timing HSYNC/VSYNC Field Timing Parameters Interlace support for Plane a graphics Blend FunctionInterlaced Video Field display Arib 960 X 540 support DVO Control Data Bits Interlace support for Video Overlay Window Timing Register Switching DDC Display Data Channel Analog Display Port CharacteristicsIntegrated Ramdac 146 D15343-003 Power and Thermal Management General Description of Acpi States General Description of Supported CPU States Hysteresis Operation Internal Thermal SensorOverview Usage External Thermal Sensor Input Pin Name Strap Description Configuration Type Buffer Type Strapping ConfigurationStrapping Signals and Configuration FSB Freq DDR Freq Gfx Freq Core Vcc Intel 82854 Gmch Straps for Frequency/CPU ConfigurationGST20 Ballout and Package Information Name Voltage Level Ball out VCC/VSS Voltage GroupsVoltage Levels and Ball Out for Voltage Groups Ballout Table Row Column Signal Name 156 D15343-003 D15343-003 157 158 D15343-003 D15343-003 159 160 D15343-003 D15343-003 161 162 D15343-003 D15343-003 163 Package Mechanical Information Intel 82854 Gmch Micro-FCBGA Package Dimensions Top View Intel 82854 Gmch Micro-FCBGA Package Dimensions Side View Intel 82854 Gmch Micro-FCBGA Package Dimensions Bottom View