Intel
855PM Chipset Memory
Controller Hub (MCH) DDR 200/266
MHz
Datasheet
March 2003
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Order Number:
252613-001
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2
Intel
855PM Chipset Memory Controller Hub (MCH)
DDR 200/266 MHz Datasheet
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The Intel
855PM Memory Controller Hub (MCH) may contain design defects or errors known as errata which may cause the product to deviate from
published specifications. Current characterized errata are available on request.
Contact your local Intel sales office or your distributor to obtain the latest specifications and before placing your product order.
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Copyright Intel Corporation 2003
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Intel
855PM Chipset Memory Controller Hub (MCH)
3
DDR 200/266 MHz Datasheet
Contents
1.
Introduction .................................................................................................................................15
1.1.
Reference Documents ...................................................................................................16
1.2.
Terminology ...................................................................................................................17
1.3.
System Architecture.......................................................................................................18
1.4.
Processor Host Interface ...............................................................................................18
1.4.1.
Host Bus Error Checking ..................................................................................19
1.5.
DRAM Interface .............................................................................................................19
1.6.
AGP Interface ................................................................................................................21
1.7.
Hub Interface .................................................................................................................21
1.8.
MCH Clocking ................................................................................................................21
1.9.
System Interrupts...........................................................................................................22
2.
Signal Description.......................................................................................................................23
2.1.
Host Interface Signals....................................................................................................24
2.2.
DDR Interface ................................................................................................................26
2.3.
Hub Interface Signals.....................................................................................................27
2.4.
AGP Interface Signals....................................................................................................27
2.4.1.
AGP Addressing Signals ..................................................................................27
2.4.2.
AGP Flow Control Signals ................................................................................28
2.4.3.
AGP Status Signals ..........................................................................................28
2.4.4.
AGP Strobes .....................................................................................................29
2.4.5.
AGP/PCI Signals-Semantics ............................................................................30
2.5.
Clocks, Reset, and Miscellaneous.................................................................................32
2.6.
Voltage References, PLL Power....................................................................................33
2.7.
Reset States and Pull-up/Pull-downs ............................................................................34
3.
Register Description ...................................................................................................................39
3.1.
Conceptual Overview of the Platform Configuration Structure......................................39
3.2.
Standard PCI Bus Configuration Mechanism ................................................................39
3.3.
Routing Configuration Accesses....................................................................................40
3.3.1.
PCI Bus #0 Configuration Mechanism..............................................................40
3.3.2.
Primary PCI and Downstream Configuration Mechanism ................................40
3.3.3.
AGP Configuration Mechanism ........................................................................41
3.4.
MCH Register Introduction ............................................................................................41
3.5.
I/O Mapped Registers ....................................................................................................42
3.5.1.
CONFIG_ADDRESS Configuration Address Register ..................................42
3.5.2.
CONFIG_DATA - Configuration Data Register ................................................44
3.6.
Memory Mapped Register Space ..................................................................................44
3.6.1.
SMRCTL System Memory RCOMP Control Register Device #0 ................45
3.6.2.
DRAMWIDTH DRAM Width Register ............................................................46
3.6.3.
DCLKDIS DRAM Clock Control Disable Register .........................................46
3.6.4.
DQCMDSTR Strength Control Register for DQ and CMD Signal Groups ....49
3.6.5.
CKESTR Strength Control Register for CKE Signal Group...........................50
3.6.6.
CSBSTR Strength Control Register for CS# Signal Group ...........................51
3.6.7.
CKSTR Strength Control Register for CK Signal Group (CK / CK#) .............52
3.6.8.
RCVENSTR Strength Control Register for RCVENOUT# Signals................53
3.6.9.
CGREDSTR Strength Control Register for CMD Group Reduced Strength
Signals ..............................................................................................................54
3.7.
Host-Hub Interface Bridge Device Registers Device #0.............................................54
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4
Intel
855PM Chipset Memory Controller Hub (MCH)
DDR 200/266 MHz Datasheet
3.7.1.
VID Vendor Identification Register Device#0............................................. 57
3.7.2.
DID Device Identification Register Device#0 ............................................. 57
3.7.3.
PCICMD PCI Command Register Device #0............................................. 58
3.7.4.
PCISTS PCI Status Register Device #0..................................................... 59
3.7.5.
RID Revision Identification Register Device #0 ......................................... 60
3.7.6.
SUBC Sub-Class Code Register Device #0............................................... 60
3.7.7.
BCC Base Class Code Register Device #0 ............................................... 60
3.7.8.
MLT Master Latency Timer Register Device #0......................................... 61
3.7.9.
HDR Header Type Register Device #0 ...................................................... 61
3.7.10.
APBASE Aperture Base Configuration Register Device #0....................... 62
3.7.11.
SMRBASE System Memory RCOMP Base Address Register Device #0 . 63
3.7.12.
SVID Subsystem Vendor ID Device #0...................................................... 63
3.7.13.
SID Subsystem ID Device #0..................................................................... 64
3.7.14.
CAPPTR Capabilities Pointer Device #0.................................................... 64
3.7.15.
AGPM AGP Miscellaneous Configuration Device #0................................. 64
3.7.16.
DQSMRG DQS Margining Control Register Device #0 ............................. 65
3.7.17.
DRB DRAM Row Boundary Register Device #0........................................ 65
3.7.18.
DRA DRAM Row Attribute Register Device #0.......................................... 66
3.7.19.
DRT DRAM Timing Register Device #0 ..................................................... 67
3.7.20.
DRC DRAM Controller Mode Register Device #0...................................... 71
3.7.21.
DRDCTL DRAM Read Timing Control Register Device #0 ....................... 73
3.7.22.
DORC DRAM Opportunistic Refresh Control Register Device #0............. 74
3.7.23.
DQSCTL DQS Control Register Device #0................................................ 74
3.7.24.
ECCDIAG - ECC Diagnostic Control Register Device #0 ............................. 75
3.7.25.
DERRSYN DRAM Error Syndrome Register Device #0 ............................ 75
3.7.26.
DES DRAM Error Status Register Device #0............................................. 76
3.7.27.
DEAP DRAM Error Address Pointer Register Device #0........................... 77
3.7.28.
PAM[0:6] Programmable Attribute Map Registers Device #0 .................... 78
3.7.29.
FDHC Fixed DRAM Hole Control Register Device #0 ............................... 82
3.7.30.
SMRAM System Management RAM Control Register Device #0 ............. 83
3.7.31.
ESMRAMC Extended System Mgmt RAM Control Register Device #0 .... 84
3.7.32.
ACAPID AGP Capability Identifier Register Device #0 .............................. 85
3.7.33.
AGPSTAT AGP Status Register Device #0 ............................................... 86
3.7.34.
AGPCMD AGP Command Register Device #0.......................................... 87
3.7.35.
AGPCTRL AGP Control Register.................................................................. 88
3.7.36.
APSIZE Aperture Size Device #0............................................................... 89
3.7.37.
ATTBASE Aperture Translation Table Base Register Device #0 .............. 90
3.7.38.
AMTT AGP Interface Multi-Transaction Timer Register Device #0 ........... 91
3.7.39.
LPTT AGP Low Priority Transaction Timer Register Device #0 ................ 92
3.7.40.
TOM Top of Low Memory Register Device #0........................................... 92
3.7.41.
MCHCFG MCH Configuration Register Device #0 .................................... 93
3.7.42.
ERRSTS Error Status Register Device #0 ................................................. 94
3.7.43.
ERRCMD Error Command Register Device #0 ......................................... 96
3.7.44.
SMICMD SMI Command Register Device #0 ............................................ 98
3.7.45.
SCICMD SCI Command Register Device #0............................................. 99
3.7.46.
WCCTL Write Cache Control Register Device #0 ................................... 100
3.7.47.
SKPD Scratchpad Data Device #0........................................................... 101
3.7.48.
CAPID Product Specific Capability register Device #0 ............................ 101
3.7.49.
MCHTST MCH Test Register Device #0.................................................. 102
3.8.
AGP Bridge Registers Device #1 ............................................................................. 102
3.8.1.
VID1 Vendor Identification Register Device #1........................................ 105
3.8.2.
DID1 Device Identification Register Device #1 ........................................ 105
3.8.3.
PCICMD1 PCI-PCI Command Register Device #1.................................. 106
3.8.4.
PCISTS1 PCI-PCI Status Register Device #1 ......................................... 107
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Intel
855PM Chipset Memory Controller Hub (MCH)
5
DDR 200/266 MHz Datasheet
3.8.5.
RID1 Revision Identification Register Device #1 ......................................108
3.8.6.
SUBC1- Sub-Class Code Register Device #1.............................................108
3.8.7.
BCC1 Base Class Code Register Device #1............................................109
3.8.8.
MLT1 Master Latency Timer Register Device #1 .....................................109
3.8.9.
HDR1 Header Type Register Device #1...................................................109
3.8.10.
PBUSN1 Primary Bus Number Register Device #1 .................................110
3.8.11.
SBUSN1 Secondary Bus Number Register Device #1 ............................110
3.8.12.
SUBUSN1 Subordinate Bus Number Register Device #1........................110
3.8.13.
SMLT1 Secondary Master Latency Timer Register Device #1 ................111
3.8.14.
IOBASE1 I/O Base Address Register Device #1......................................112
3.8.15.
IOLIMIT1 I/O Limit Address Register Device #1.......................................112
3.8.16.
SSTS1 Secondary PCI-PCI Status Register Device #1 ...........................113
3.8.17.
MBASE1 Memory Base Address Register Device #1 ..............................114
3.8.18.
MLIMIT1 Memory Limit Address Register Device #1 ...............................115
3.8.19.
PMBASE1 Prefetchable Memory Base Address Register Device #1 ......116
3.8.20.
PMLIMIT1 Prefetchable Memory Limit Address Register Device #1 .......117
3.8.21.
BCTRL1 PCI-PCI Bridge Control Register Device #1 ..............................118
3.8.22.
ERRCMD1 Error Command Register Device #1......................................119
3.8.23.
DWTC DRAM Write Throttling Control Register Device #1......................120
3.8.24.
DRTC DRAM Read Throttling Control Register Device #1 ......................122
3.8.25.
TSCR Thermal Sensor Control Register Device #1 .................................124
3.8.26.
TSSR Thermal Sensor Status Register Device #1...................................125
3.8.27.
THTS Thermal Sensor High Temperature Setting Register Device #1....125
3.8.28.
TCTS Thermal Sensor Catastrophic Temperature Setting Register Device
#1 ...................................................................................................................126
3.8.29.
TCOR Thermal Calibration Offset Register Device #1.............................126
3.8.30.
TSHTC Thermal Sensor Hardware Throttling Control Register Device
#1
...................................................................................................................127
3.9.
Power Management Registers Device #6 ................................................................128
3.9.1.
VID6 Vendor Identification Register Device #6 ........................................129
3.9.2.
DID6 Device Identification Register Device #6.........................................130
3.9.3.
PCICMD6 PCI Command Register Device #6 .........................................130
3.9.4.
PCISTS6 PCI Status Register Device #6 .................................................131
3.9.5.
RID6 Revision Identification Register Device #6 ......................................131
3.9.6.
SUBC6- Sub-Class Code Register Device #6.............................................132
3.9.7.
BCC6 Base Class Code Register Device #6............................................132
3.9.8.
HDR6 Header Type Register Device #6...................................................132
3.9.9.
BAR6 Base Address Register Device #6 .................................................133
3.9.10.
PMCR Power Management Control Register Device #6..........................134
3.9.11.
PMCER Power Management Control Extension Register Device #6 ......135
4.
System Address Map ...............................................................................................................137
4.1.
Memory Address Ranges ............................................................................................137
4.1.1.
VGA and MDA Memory Space .......................................................................138
4.1.2.
PAM Memory Spaces .....................................................................................139
4.1.3.
ISA Hole Memory Space ................................................................................140
4.1.4.
TSEG SMM Memory Space ...........................................................................140
4.1.5.
IOAPIC Memory Space ..................................................................................141
4.1.6.
System Bus Interrupt Memory Space.............................................................141
4.1.7.
High SMM Memory Space..............................................................................141
4.1.8.
AGP Aperture Space (Device #0 BAR) ..........................................................141
4.1.9.
AGP Memory and Prefetchable Memory........................................................142
4.1.10.
Hub Interface A Subtractive Decode ..............................................................142
4.2.
AGP Memory Address Ranges....................................................................................142
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