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Intel D15343-003 manual Internal Thermal Sensor, Overview, Hysteresis Operation

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Power and Thermal Management

7.3Internal Thermal Sensor

This section describes the new on-die Thermal sensor capability.

7.3.1Overview

The Thermal sensor functions are provided below:

Catastrophic Trip Point: This trip point is programmed through the BIOS during initialization. This trip point is set at the temperature at which the GMCH should be shut down immediately with minimal software support. The settings for this are lockable.

High Temperature Trip Point: This trip point is nominally 14ºC below the Catastrophic trip point. The BIOS can be programmed to provide an interrupt when it is crossed in either direction. Upon the trip event, Hardware Throttling may be enabled when the temperature is exceeded.

7.3.2Hysteresis Operation

Hysteresis provides a small amount of positive feedback to the Thermal sensor circuit to prevent a trip point from flipping back and forth rapidly when the temperature is right at the trip point.

D15343-003

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Intel D15343-003 manual Internal Thermal Sensor, Overview, Hysteresis Operation

Contents

Intel 82854 Graphics Memory Controller Hub Gmch DatasheetD15343-003 Contents Intel 82854 Graphics Memory Controller Hub Gmch 10.9 127 Figures 152 Date Revision Description Revision HistoryIntel 82854 Graphics Memory Controller Hub Gmch Memory System OverviewProcessor/Host Bus Support Video Overlay System InterruptsVideo Stream Decoder Display Internal Graphics FeaturesIntel 82854 Graphics Memory Controller Hub Gmch Hub Interface to ICH4-M Graphic Power ManagementPower Management Package Intel 854 Chipset system block diagram Native Graphic modeTerm Description TerminologyTerms and Descriptions ICH4-M Document Location Reference DocumentsReference Documents Intel 82854 Graphics Memory Controller Hub Gmch Intel 82854 Gmch System ArchitectureGmch System Memory Interface Processor Host InterfaceDDR Sdram Memory Capacity Technology WidthDisplay Features Graphics FeaturesGmch Analog Display Port Gmch Integrated DVO PortsAddress Decode Policies Hub InterfaceIntel 82854 Gmch Interface Clocks Gmch ClockingRatio Bytes MB/sSystem Interrupts Buffer Description Notation DescriptionHost Interface Signal Descriptions Host Interface SignalsHIT# DRDY#HITM# HLOCK#RS20# Response type RS20#DDR Sdram Interface Descriptions DDR Sdram InterfaceSRAS# SCAS#Hub Interface Signals Hub Interface SignalsClocks Dpms Display Power Management Signaling This signal is used onlyDAC Clocking DrefclkDigital 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 DescriptionsAnalog CRT Display Dvob and Dvoc Port Common Signal DescriptionsAnalog CRT Display Signal Descriptions Gpio Signal Descriptions General Purpose Input/Output SignalsVoltage References, PLL Power Voltage References, PLL PowerPswing HlrcompHlvref VcchlGmch Function Bus #0, Device# Conceptual Overview of the Platform Configuration StructureDevice Number Assignment Nomenclature for Access Attributes Nomenclature for Access AttributesPCI Bus #0 Configuration Mechanism Standard PCI Bus Configuration MechanismRouting Configuration Accesses Default Value upon Reset Primary PCI and Downstream Configuration MechanismRegister Definitions Reserved BitsI/O Mapped Registers Configaddress Configuration Address RegisterReserved Bit DescriptionsConfiguration Data Register Configdata Configuration Data RegisterVGA I/O Mapped Register List VGA I/O Mapped RegistersIndex Data Registers Name Function Read @ Write @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 RegisterPCI Status Register Subc Sub Class Code Register RID Register IdentificationSvid Subsystem Vendor Identification Register BCC Base Class Code RegisterHDR Header Type Register Capptr Capabilities Pointer Register SID Subsystem Identification RegisterCapability ID Capid Capabilities Identification Register Device #0GMC Gmch Miscellaneous Control Register Device #0 Rrbar Access Enable-R/WMDA Present MDAP-R/W VGABit 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 DOS Application Area 00000h-9FFFh PAM Registers and Associated System Memory SegmentsVideo Buffer Area A0000h-BFFFFh Expansion Area C0000h-DFFFFhSmram 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 #0Reserved SCI on Multiple-bit ECC Error Scicmd SCI Error Command Register Device #0SCI on Single-bit ECC Error SCI on Gmch Thermal Sensor TripReserved FSB Data Bus Power Management Control Reserved On Die Termination ODT Gating DisableC2 state Gmch FSB Interface Power Management Control Shic Secondary Host Interface Control Register Device #0HEM 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 DDR Write Recovery time tWR DDR Internal Write to Read Command delay tWTRDRT Dram Timing Register Device #0 Examples of usageBack To Back Read-Read commands spacing DDR, different Rows Encoding CK between RD and WR commandsEncoding CK between RD and RD commands Refresh Cycle Time tRFCReserved CAS# Latency tCL Activate to Precharge delay tRAS, MAXActivate to Precharge delay tRAS, MIN CS# Signal Drive Control PCEn Page Close Enable TC Timer Control PDEn23Dynamic Memory Interface Power Management Rcven DLL shutdown disablePower State S1/S3 Refresh Control Ddim DDR Sdram Data Integrity Mode DRC Dram Controller Mode Register Device #0001 000010 011For Double Data Rate DTC Dram Throttling Control Register Device #0 Wttc DDR Sdram Throttle Mode Tmode2724 High Priority Stream Throttling Enable Thermal Power Throttle Control fields EnableHpllcc 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 #0HPLLCC20 Straps Read GFX CoreDVO Port CRT Port RateRegs Register NameDid Device Identification Register Device #2 VID Vendor Identification Register Device #2Pcicmd PCI Command Register Device #2 RID Revision Identification Register Device #2 Pcists PCI Status Register Device #2CC Class Code Register Device #2 MLT Master Latency Timer Register Device #2CLS Cache Line Size Register Device #2 Base Class Code Basec 03=Display controllerPrefetchable Memory-RO Enable prefetching Bit Description Master Latency Timer Count Value ROHDR Header Type Register Device #2 Gmadr Graphics Memory Range Address Register Device #2Iobar I/O Base Address Register Device #2 Mmadr Memory Mapped Range Address Register Device #2Prefetchable Memory-RO Prevents prefetching Memory / IO Space-ROSID 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 #2Simplified View of System Address Map System Memory Address RangesDetailed View of System Address Map DOS Compatibility AreaDOS Area 000000h-09FFFFh System Memory Segments and Their AttributesLegacy VGA Ranges 0A0000h-0BFFFFh Compatible Smram Address Range 0A0000h-0BFFFFhSystem Bios Area 0F0000h-0FFFFFh Extended System Bios Area 0E0000h-0EFFFFhExtended System Memory Area Monochrome Display Adapter MDA Range 0B0000h 0B7FFFhPre-allocated System Memory 1 15 MB-16 MB WindowPre-allocated System Memory Attributes CommentsHseg Extended Smram Address Range Hseg and TsegTseg Dynamic Video Memory Technology DvmtPCI Memory Address Range Top of Main System Memory to 4 GB High Bios Area FFE00000h -FFFFFFFFhSMM 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 MappingHub Interface Decode Rules Hub Interface Accesses to Gmch that Cross Device BoundariesInterface Decode Rules Cycles Initiated Using PCI ProtocolAccesses to Gmch that Cross Device Boundaries Dynamic Bus Inversion Host Interface OverviewSystem Bus Interrupt Delivery Relation of DBI Bits to Data BitsConfiguration Mechanism for DDR DIMMs System Memory Organization and ConfigurationSystem Memory Interface Upstream Interrupt MessagesSystem Memory Register Programming DDR Sdram Performance DescriptionData Bytes on DDR Dimm Used for Programming Dram Registers Byte Function1 3D/2D Instruction Processing Integrated Graphics Overview2 3D Engine Setup EngineViewport Transform and Perspective Divide 2.3 3D Primitives and Data Formats SupportScan Converter Backface CullingTexture Engine Perspective Correct Texture SupportTexture Map Filtering Texture ChromakeyAnti-Aliasing Multiple Texture Composition Raster EngineCubic Environment Mapping Bump MappingCombining Intrinsic and Specular Color Components Texture Map BlendingColor Shading Modes Color DitheringDepth Buffer Alpha BlendingColor Buffer Formats Destination Alpha Stencil Buffer 4 2D EngineProjective Textures 4.1 256-Bit Pattern Fill and BLT EngineDual Display Usage Model Native Graphic Mode only Hardware Cursor Plane Native Graphic Mode onlyPlanes and Engines Alpha Stretch BLTOverlay Plane Dynamic Bob and Weave Color ControlMPEG-2 Decoding Video FunctionalityHardware Motion Compensation Sub-picture SupportPipe a Timing Generator Unit Internal Graphic Display InterfaceArib Support 1.2 H, V timing signals for active and blank timingHSYNC/VSYNC Field Timing ParametersInterlace support for Plane a graphics Blend FunctionInterlaced Video Field display Arib 960 X 540 support DVO Control Data Bits Interlace support for Video Overlay WindowTiming 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 StatesHysteresis Operation Internal Thermal SensorOverview Usage External Thermal Sensor InputPin 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 Name156 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 ViewIntel 82854 Gmch Micro-FCBGA Package Dimensions Side View Intel 82854 Gmch Micro-FCBGA Package Dimensions Bottom View