Datasheet

Datasheet 3
Contents
1Introduction............................................................................................................15
1.1 Terminology .....................................................................................................17
1.2 MCH Overview ..................................................................................................20
1.2.1 Host Interface........................................................................................20
1.2.2 System Memory Interface .......................................................................20
1.2.3 Direct Media Interface (DMI)....................................................................21
1.2.4 PCI Express* Interface............................................................................22
1.2.5 MCH Clocking ........................................................................................23
1.2.6 Power Management ................................................................................23
1.2.7 Thermal Sensor .....................................................................................23
2 Signal Description ...................................................................................................25
2.1 Host Interface Signals........................................................................................26
2.2 System Memory (DDR2) Interface Signals ............................................................29
2.2.1 System Memory Channel A Interface Signals..............................................29
2.2.2 System Memory Channel B Interface Signals..............................................30
2.2.3 System Memory Miscellaneous Signals ......................................................31
2.3 PCI Express* Interface Signals............................................................................31
2.4 Controller Link Interface Signals..........................................................................32
2.5 Clocks, Reset, and Miscellaneous.........................................................................32
2.6 Direct Media Interface........................................................................................33
2.7 Power and Grounds ...........................................................................................34
3 System Address Map ...............................................................................................35
3.1 Legacy Address Range .......................................................................................38
3.1.1 DOS Range (0h – 9_FFFFh) ..................................................................... 38
3.1.2 Expansion Area (C_0000h-D_FFFFh).........................................................39
3.1.3 Extended System BIOS Area (E_0000h–E_FFFFh).......................................39
3.1.4 System BIOS Area (F_0000h–F_FFFFh)..................................................... 40
3.1.5 PAM Memory Area Details........................................................................40
3.2 Main Memory Address Range (1MB – TOLUD)........................................................40
3.2.1 ISA Hole (15 MB –16 MB)........................................................................41
3.2.2 TSEG....................................................................................................42
3.2.3 Pre-allocated Memory .............................................................................42
3.3 PCI Memory Address Range (TOLUD – 4 GB) ........................................................43
3.3.1 APIC Configuration Space (FEC0_0000h–FECF_FFFFh)................................. 45
3.3.2 HSEG (FEDA_0000h–FEDB_FFFFh) ...........................................................45
3.3.3 FSB Interrupt Memory Space (FEE0_0000–FEEF_FFFF)................................45
3.3.4 High BIOS Area......................................................................................45
3.4 Main Memory Address Space (4 GB to TOUUD)......................................................46
3.4.1 Memory Re-claim Background..................................................................47
3.4.2 Memory Reclaiming ................................................................................47
3.5 PCI Express* Configuration Address Space ...........................................................47
3.6 PCI Express* Address Space...............................................................................48
3.7 System Management Mode (SMM).......................................................................49
3.7.1 SMM Space Definition .............................................................................49
3.7.2 SMM Space Restrictions ..........................................................................50
3.7.3 SMM Space Combinations........................................................................50
3.7.4 SMM Control Combinations......................................................................51
3.7.5 SMM Space Decode and Transaction Handling ............................................51
3.7.6 Processor WB Transaction to an Enabled SMM Address Space.......................51