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Intel® 460GX Chipset System Software Developer’s Manual iii
Contents
1 Introduction......................................................................................................................1-1
1.1 System Overview ...............................................................................................1-1
1.1.1 Component Overview............................................................................1-2
1.2 Product Features................................................................................................1-3
1.3 Itanium™ Processor System Bus Support.........................................................1-3
1.4 DRAM Interface Support ....................................................................................1-4
1.5 I/O Support.........................................................................................................1-4
1.5.1 PXB Features ........................................................................................1-4
1.5.2 WXB Features .......................................................................................1-6
1.5.3 GXB Features........................................................................................1-6
1.6 RAS Features.....................................................................................................1-6
1.7 Other Platform Components...............................................................................1-6
1.7.1 I/O & Firmware Bridge (IFB)..................................................................1-6
1.7.2 Programmable Interrupt Device (PID)...................................................1-7
1.8 Reference Documents........................................................................................1-7
1.9 Revision History .................................................................................................1-7
2 Register Descriptions ......................................................................................................2-1
2.1 Access Mechanism ............................................................................................2-1
2.2 Access Restrictions ............................................................................................2-2
2.2.1 Partitioning ............................................................................................2-2
2.2.2 Register Attributes.................................................................................2-3
2.2.3 Reserved Bits Defined in Registers.......................................................2-3
2.2.4 Reserved or Undefined Register Locations...........................................2-3
2.2.5 Default Upon Reset ...............................................................................2-3
2.2.6 Consistency...........................................................................................2-4
2.2.7 GART Programming Region .................................................................2-4
2.3 I/O Mapped Registers ........................................................................................2-4
2.3.1 CONFIG_ADDRESS: Configuration Address Register .........................2-4
2.3.2 CONFIG_DATA: Configuration Data Register ......................................2-5
2.4 Error Handling Registers....................................................................................2-5
2.4.1 SAC .......................................................................................................2-5
2.4.2 SDC.....................................................................................................2-11
2.4.3 MAC ....................................................................................................2-21
2.4.4 PXB .....................................................................................................2-22
2.4.5 GXB.....................................................................................................2-24
2.4.6 WXB ....................................................................................................2-27
2.5 Performance Monitor Registers........................................................................2-30
2.5.1 SAC .....................................................................................................2-30
2.5.2 SDC.....................................................................................................2-34
2.5.3 PXB .....................................................................................................2-36
2.5.4 GXB.....................................................................................................2-38
2.5.5 WXB ....................................................................................................2-43
2.6 Interrupt Related Registers ..............................................................................2-44
2.6.1 SAC .....................................................................................................2-44
2.6.2 PID PCI Memory-mapped Registers ...................................................2-45
2.6.3 PID Indirect Access Registers.............................................................2-46