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Intel® 460GX Chipset System Software Developer’s Manual vii
8.2.14 Extended Hot-Plug Miscellaneous ......................................................8-18
9 IFB Register Mapping......................................................................................................9-1
9.1 PCI / LPC / FWH Configuration..........................................................................9-1
9.1.1 PCI Configuration Registers (Function 0)..............................................9-1
9.2 IDE Configuration...............................................................................................9-3
9.2.1 PCI Configuration Registers (Function 1)..............................................9-3
9.3 Universal Serial Bus (USB) Configuration..........................................................9-4
9.3.1 PCI Configuration Registers (Function 2)..............................................9-4
9.4 SMBus Controller Configuration.........................................................................9-5
9.4.1 SMBus Configuration Registers (Function 3) ........................................9-5
10 IFB Usage Considerations ............................................................................................10-1
10.1 Usage of 1MIN Timer in Power Management ..................................................10-1
10.2 Usage of the SW SMI# Timer...........................................................................10-1
10.3 CD-ROM AUTO RUN Feature of the OS .........................................................10-1
10.4 ACPI, SMBus, GPIO Base Address Reporting to the OS ................................10-1
10.5 Ultra DMA Configuration ..................................................................................10-2
10.5.1 UDMAC–Ultra DMA Control Register (IFB Function 1 PCI
Configuration Offset 48h) ....................................................................10-2
10.5.2 UDMATIM–Ultra DMA Timing Register (IFB Function 1 PCI
Configuration Offsets 4A-4Bh) ............................................................10-2
10.5.3 Determining a Drive’s Transfer Rate Capabilities ...............................10-3
10.5.4 Determining a Drive’s Best Ultra DMA Capability ...............................10-5
10.5.5 Determining a Drive’s Best Multi Word DMA/Single Word DMA
(Non-ultra DMA) Capability .................................................................10-5
10.5.6 IFB Timing Settings .............................................................................10-9
10.5.7 Drive Configuration for Selected Timings..........................................10-11
10.5.8 Settings Checklist..............................................................................10-13
10.5.9 Example Configurations ....................................................................10-14
10.5.10 Ultra DMA System Software Considerations.....................................10-16
10.5.11 Additional Ultra DMA/PCI Bus Master IDE Device Driver
Considerations ..................................................................................10-17
10.6 USB Resume Enable Bit ................................................................................10-19
11 LPC/FWH Interface Configuration.................................................................................11-1
11.1 PCI to LPC/FWH Interface Configuration Space Registers (PCI Function 0) ..11-1
11.1.1 VID–Vendor Identification Register (Function 0) .................................11-1
11.1.2 DID–Device Identification Register (Function 0) .................................11-1
11.1.3 PCICMD–PCI Command Register (Function 0) ..................................11-2
11.1.4 PCISTS–PCI Device Status Register (Function 0)..............................11-2
11.1.5 RID–Revision Identification Register (Function 0)...............................11-3
11.1.6 CLASSC–Class Code Register (Function 0).......................................11-3
11.1.7 HEDT–Header Type Register (Function 0) .........................................11-3
11.1.8 ACPI Base Address (Function 0) ........................................................11-4
11.1.9 ACPI Enable (Function 0)....................................................................11-4
11.1.10 SCI IRQ Routing Control.....................................................................11-4
11.1.11 BIOSEN–BIOS Enable Register (Function 0) .....................................11-5
11.1.12 PIRQRC[A:D]–PIRQx Route Control Registers (Function 0) ..............11-5
11.1.13 SerIRQC–Serial IRQ Control Register (Function 0) ............................11-6
11.1.14 TOM–Top of Memory Register (Function 0)........................................11-6
11.1.15 MSTAT–Miscellaneous Status Register (Function 0)..........................11-7