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Intel 460GX 11.1.11BIOSEN–BIOSEnable Register (FUNCTION 0), 11.1.12PIRQRC[A:D]–PIRQxRoute Control Registers (Function 0)

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LPC/FWH Interface Configuration

11.1.11BIOSEN–BIOS Enable Register (FUNCTION 0)

Address Offset:	4E-4Fh
Default Value:	07C1h
Attribute:	Read/Write

This register is used to implement protections to writes to firmware (BIOS) ranges.

Bit	Description

15	BLE - BIOS Lock Enable: When the bit is a “1”, setting BIOS_WEN bit will cause SMIs. When this
	bit is a “0”, setting BIOS_WEN will not cause SMIs. Once set, this bit can only be cleared by a
	PCIRST#.

14:11	Reserved.

10:3	Reserved. Software must preserve these register values.

2	BIOS_WEN - BIOS Write Enable. When this bit is set to a “1”, writes to firmware (BIOS) ranges
	are allowed. When this bit is a “0”, writes to firmware (BIOS) ranges are not allowed and write
	cycles will be master-aborted on PCI. There is no protection on writes to FWH register space.
	When this bit is written from a “0” to a “1”, and bit 15 (BIOS Lock Enable) is set, an SMI# is
	generated.

1:0	Reserved. Software must preserve these register values.

11.1.12PIRQRC[A:D]–PIRQx Route Control Registers (Function 0)

Address Offset: 60h (PIRQRCA#)–63h (PIRQRCD#)

Default Value: 80h

Attribute: R/W

These registers control the routing of the PIRQ[A:D]# signals to the IRQ inputs of the interrupt controller. Each PIRQx# can be independently routed to any one of 11 interrupts. All four PIRQx# lines can be routed to the same IRQx input. Note that the IRQ that is selected through bits [3:0] must be set to level sensitive mode in the corresponding ELCR Register. When a PIRQ signal is routed to an interrupt controller IRQ, the IFB masks the corresponding IRQ signal.

Bit			Description

7	Interrupt Routing Enable. When this bit is a “0”, the corresponding PIRQ is routed to one of the
	compatibility mode interrupts specified in bits[3:0]. When this bit is a “1”, the PIRQ is not routed.

6:4	Reserved.

3:0	Interrupt Routing. When bit 7=0, this field selects the routing of the PIRQx to one of the interrupt
	controller interrupt inputs.
	Bits[3:0]	IRQ Routing	Bits[3:0]	IRQ Routing	Bits[3:0]	IRQ Routing
	0000	Reserved	0110	IRQ6	1011	IRQ11
	0001	Reserved	0111	IRQ7	1100	IRQ12
	0010	Reserved	1000	Reserved	1101	Reserved
	0011	IRQ3	1001	IRQ9	1110	IRQ14
	0100	IRW4	1010	IRQ10	1111	IRQ15
	0101	IRQ5

Intel® 460GX Chipset Software Developer’s Manual

11-5

Contents

Page Page Contents Page Page Page Page Page Page Figures Tables Page Introduction 1.1System Overview 1.1.1Component Overview Table 1-1.Intel® 460GX Chipset Components 1.2Product Features 1.3Itanium™ Processor System Bus Support 1.4DRAM Interface Support 1.5I/O Support 1.6RAS Features 1.7Other Platform Components 1.8Reference Documents 1.9Revision History Page Register Descriptions 2.1Access Mechanism 2.2Access Restrictions 2.2.2Register Attributes 2.2.3Reserved Bits Defined in Registers 2.2.4Reserved or Undefined Register Locations 2.2.5Default Upon Reset default 2.3I/O Mapped Registers 2.4Error Handling Registers 7Disable 6Valid ITID DEDTID: DED ITID FSETID: FSE ITID 2.4.1.4FERR_SAC: First Error Status Register 31Memory Card B Error (MBE) 30Memory Card A Error (MAE) 29XSERR# Asserted (XSA) 28‘Store-Write’Command Underflow, card A, Stack L (SCAL) 18‘Completion’ Command Underflow; MAC B, Stack R (CCBR) 17BERR# Observed (BER) 16IOQ Underflow/Overflow (IUE) 15reserved(0) 14External XBINIT# Active. (XBE) 2.4.1.6SA_FERR: System Address on First Error 106LOCK, ’b’ phase 105ADS, ’b’ phase 104RP#, ’b’ phase. 103:99 REQ, ’b’ phase 98AP1; ’b’ phase 2.4.1.8BIUDATA: BIU Data Register 115:82 Address bits [35:2] Reqa DID BE 2.4.2SDC 2.4.2.1SEC0_D_FERR: Data on First Memory Card B SEC 2.4.2.2SEC0_ECC_FERR: ECC on First Memory Card B SEC 2.4.2.3SEC0_TXINFO_FERR: TXINFO on First Memory Card B SEC 2.4.2.4DED0_D_FERR: Data on First Memory Card B DED 2.4.2.5DED0_ECC_FERR: ECC on First Memory Card B DED 2.4.2.6DED0_TXINFO_FERR: TXINFO on First Memory Card B DED 2.4.2.7SEC1_D_FERR: Data on First Memory Card A SEC 2.4.2.8SEC1_ECC_FERR: ECC on First Memory Card A SEC 2.4.2.9SEC1_TXINFO_FERR: TXINFO on First Memory Card A SEC 2.4.2.10DED1_D_FERR: Data on First Memory Card A DED 2.4.2.11DED1_ECC_FERR: ECC on First Memory Card A DED 2.4.2.12DED1_TXINFO_FERR: TXINFO on First Memory Card A DED 2.4.2.13SDC_FERR: First Error Status Register 30PDB Receive Length Error (RLE) Private Bus receive length error 29DRDY# Protocol Error (FS2) 26’Forward’ Overlapping ’Forward’; Card A (FWMDI1) 25’Load’ Overlapping ’Load’; Card A (LRMDI1) 24’Load’ Overlapping ’Forward’; Card A (WrRd1) 23’Forward’ Overlapping ’Load’; Card A (RdWr1) 22’Forward’ Underflow; Card A Right Stack Error (FR1) 5System Bus Double Bit Error (DEDF) 4System Bus Single Bit Error (SECF) 3SDC Card A Double Bit Error (DED1) 2SDC Card A Single Bit Error (SEC1) 1SDC Card B Double Bit Error (DED0) 2.4.2.17SDCRSP_FERR: Response on First SDCRSP Error 2.4.2.18DPBRLE_FERR: Private Data Bus Receive Length Error 2.4.2.19ECCMSK0: ECC Mask Register - Card B ECC Generation Mask 2.4.2.20ECCMSK1: ECC Mask Register - Card A 2.4.2.21ECCMSKF: ECC Mask Register 2.4.2.22ParMskP: PB Parity Mask and IB Correction Enable Register 2.4.2.23PVD_D_FERR: Data on First PVD Parity Error 2.4.2.24PVD_PAR_FERR: Parity on First PVD Parity Error 2.4.2.25PVD_TXINFO_FERR: TXINFO on First PVD Parity Error 2.4.2.26SECF_D_FERR: Data on First System Bus SEC 2.4.2.27SECF_ECC_FERR: ECC on First System Bus SEC 2.4.2.28SECF_TXINFO_FERR: TXINFO on First System Bus SEC 2.4.2.29DEDF_D_FERR: Data on First System Bus DED 2.4.2.30DEDF_ECC_FERR: ECC on First System Bus DED 2.4.3MAC 2.4.3.1FERR_MAC: First Error Status Register 1Que-OverflowError 0Parity Error - CMND 2.4.3.2CMND_FERR: Command on First Error 2.4.4PXB 2.4.4.1ERRSTS: Error Status Register 6PERR# observed on PCI Bus 5Parity Error on Received PCI Data 4Parity Error on PCI Address 3Inbound Delayed Read Time-outFlag 1Performance Monitor #1 Event Flag 0Performance Monitor #0 Event Flag 2.4.4.2ERRCMD: Error Command Register 6Assert SERR# on Observed Parity Error 2.4.5GXB FERR_GXB 2FERR_PCI bit asserted 1FERR_AGP bit asserted 0 FERR_GART bit asserted 5Lo-priorityRead Data Que Parity Error 4Hi-priorityRead Data Que Parity Error 3Use of Pipe with Sideband Enabled 2AGP address from graphics card [63:40] not equal to 1AGP Request Queue Overflow 2.4.5.6NERR_GART 2.4.5.7PAC_ERR: PCI Address & Cmd First Error PCI Command PCI Address 2.4.5.8PD_ERR: PCI Data First Error 2.4.6WXB 2.4.6.1ERRSTS: Error Status Register power-good 7INTRQ Asserted Flag 6XBINIT Asserted Flag 2.4.6.2ERRCMD: Error Command Register 15XBINITO: XBinit Override Enable 13IRQE: INTRQ Enable 12ASAPE: Assert SERR# on Address Parity Error 11ASDPE: Assert SERR# on any Data Parity Error 7PCILV: PCI Error Logs Valid 6UMATA: Unexpected Master or Target Abort 5DTE: Discard Timer Expiration 4SES: System Error Signaled 3PODT: PERR# Observed on PCI Data Transfer 2.5Performance Monitor Registers 39Overflow 38:0 Count Value IT_MON_PMC_[0 to 5]: Internal Transaction Performance Monitor Config. Register 40:33 Length Encodings 32:24 DMASK Encodings 23:15 UMASK Encodings 14:8 Event Select 6:5 Disable Source 4:3 Enable Source 2:0 Reload Control 2.5.2SDC 2.5.2.1FSB_D_PMC_[1,0]: System Bus Performance Monitor Configuration Register Mask 14:8 Event Select 6:5 Disable Source 4:3 Enable Source 2:0 Reload Control 2.5.2.2FSB_D_PMD_[1,0]: System Bus Performance Monitor Data Registers 2.5.3PXB 2.5.3.1PMD[1:0]: Performance Monitoring Data Register 31:0 Count Value 2.5.3.2PMR[1:0]: Performance Monitoring Response 7:6 Interrupt Assertion 1:0 Reload Mode 2.5.3.3PME[1:0]: Performance Monitoring Event Selection 14Count Data Cycles 13:10 Initiating Agent Selection 9:8 Transaction Destination Selection 2.5.4GXB 2.5.4.1AGP_PMD_0,1: AGP Performance Monitor Data Registers 2.5.4.2PCI_PMD: PCI Performance Monitor Data Registers 2.5.4.3PERCON: Performance Monitor Control Register 1Event 1 Input 0Event 0 Input 2.5.4.4AGP_PMC_[0,1]: AGP Performance Monitor Configuration Register QW (8 bytes). Used also for code 11 0000 00 - All events 17:16 Pipe or Sideband Request Mask 13:8 Event Select 7EVENT1 Count Enable 2.5.4.5PCI_PMC: PCI Performance Monitor Configuration Register 17:16 Initiating Agent Page 2.5.5WXB 2.5.5.1PCI_WXB_PMC0: PCI Performance Monitor Configuration Register 23:21 Data Transfer and Transaction Qualifier 18:17 Issuing Agent Qualifier 16:11 Event Select 2.6Interrupt Related Registers 2.6.2PID PCI Memory-mappedRegisters Table 2-2. Memory-MappedRegister Summary 2.6.2.1I/O Register Select Register (FEC00000h) Table 2-3.I/O Select Register Format 2.6.2.2I/O Window Register (FEC00010h) 2.6.3PID Indirect Access Registers 2.6.3.1I/O (x)APIC ID Register (00h) Table 2-6. Memory-mappedRegister Summary Table 2-6. Memory-mappedRegister Summary (Cont’d) Table 2-7.I/O APIC ID Register Format 2.6.3.2I/O (x)APIC Version Register (01h) Table 2-8.I/O (x)APIC Version Register Format 2.6.3.3I/O (x)APIC Arbitration ID Register (02h) Table 2-9.I/O (x)APIC Arbitration ID Register Format 2.6.3.4I/O (x)APIC RTE (10h-8Fh) Table 2-10.I/O (x)APIC RTE Format Table 2-10.I/O (x)APIC RTE Format (Cont’d) Page System Architecture 3.1Coherency 3.2Ordering 3.3Processor to PCI Traffic and PCI to PCI (Peer-to-Peer) Traffic 3.4WXB Arbitration 3.5Big-endianSupport 3.6Indivisible Operations AGP LOCKS 3.6.2Inbound PCI Locks 3.6.3Atomic Writes 3.6.4Atomic Reads 3.6.5Locks with AGP Non-coherentTraffic 3.7Interrupt Delivery 3.8WXB PCI Hot-PlugSupport 3.8.1Slot Power-upand Enable 3.8.2Slot Power-downand Disable Page System Address Map 4.1Memory Map Figure 4-1.System Memory Address Space 4.1.1.4System Firmware 4.1.2Low Extended Memory Region 4.1.3Medium Extended Memory Region 4.1.3.1Variable GAP 4.1.4High Extended Memory (above 4G) 4.1.5Re-mappedMemory Areas 4.2I/O Address Map Figure 4-3.System I/O Address Space 4.3Devices View of the System Memory Map 4.4Legal and Illegal Address Disposition Table 4-1.Address Disposition (Cont’d) Page Memory Subsystem 5.1Organization Figure 5-1.Maximum Memory Configuration Using Two Cards Table 5-2.Minimum/Maximum Memory Size per Configuration 5.1.1DIMM Types 5.2Interleaving/Configurations 5.3Bandwidth 5.4Memory Subsystem Clocking 5.5Supporting Features 5.5.3Hardware Initialization 5.5.4Memory Scrubbing Table 5-4.Scrubbing Time Page Data Integrity and Error Handling 6.1Integrity 6.1.2DRAM 6.1.3Expander Buses 6.1.4PCI Buses 6.1.5AGP 6.1.6Private Bus between SAC and SDC 6.2Memory ECC Routing 6.3Data Poisoning 6.4Usage of First-errorand Next-error 6.4.1Masked Bits 6.4.2BERR#/BINIT# Generation 6.4.3INTREQ# 6.5SAC/SDC Errors 6.5.2System Bus Errors 6.5.3SAC to SDC Interface Errors 6.5.4SAC to MAC Interface Errors 6.5.5SDC/Memory Card Interface Errors 6.6Error Determination 6.6.1SAC Address on an Error 6.6.1.1Special Notes on Usage of SECTID, DEDTID, FSETID Registers 6.6.2SDC Logging Registers 6.7Clearing Errors 6.8Multiple Errors 6.8.1SDC Multiple Errors 6.8.2SAC Multiple Errors 6.8.3Single Errors with Multiple Reporting 6.8.4Error Anomalies 6.9Data Flow Errors 6.10Error Conditions Table 6-1.Error Cases Table 6-1.Error Cases (Cont’d) Page Page 6.11PCI Integrity 6.11.2.2Received Target Disconnect 6.11.2.3Received Target Retry 6.11.2.4Received Target Abort 6.11.2.5Data Parity Errors 6.11.3PXB as Target 6.11.3.1Target Disconnect 6.11.3.2Target Retry 6.11.3.3Target Abort 6.11.3.4Data Parity Errors 6.11.4GXB Error Flow 6.11.4.1.1 GXB_XBINIT# 6.11.4.1.2 XINTR# 6.11.4.2.1 PCI Interface Errors 6.11.4.2.2 GART Interface Errors 6.11.4.2.3 AGP Interface Errors 6.11.4.2.4 Data Errors 6.11.4.3Multiple Errors Figure 6-3.GXB Error Flow 6.12WXB Data Integrity and Error Handling 6.12.4Error Mask Bits 6.12.5Error Steering/Signaling Table 6-3.Supported Error Escalation to XBINIT#a Table 6-4.Supported Error Escalation to SERR_OUT#a Table 6-5.Supported Error Escalation to P(A/B)INTRQ# 6.12.5.1SERR# Generation 6.12.5.2XBINIT# Generation 6.12.6INTRQ# Interrupt 6.12.7Error Determination and Logging may 6.12.8.1.1 Master Abort 6.12.8.1.2 Received Target Disconnect 6.12.8.1.3 Received Target Retry 6.12.8.1.4 Received Target Abort 6.12.8.1.5 Data Parity Errors 6.12.8.1.6 Other Violations 6.12.8.2.1 Illegal PCI Request Type 6.12.8.2.2 Target Disconnect 6.12.8.2.3 Target Retry 6.12.8.2.4 Target Abort 6.12.8.3PCI Interface Errors •System Error Signaled •Discard Timer Expiration AGP Subsystem 7.1Graphics Address Relocation Table (GART) Figure 7-1.GART Table Usage for 4k Pages 12b 24b Figure 7-2.GART Table Usage for 4 MB Pages 22b 7.1.1GART Implementation Figure 7-3.GART Entry Format for 4kB Pages Figure 7-4.GART Entry Format for 4 MB Pages 7.1.1.1Page Sizes 7.1.1.2GTLB 7.1.2Programming GART 7.1.3GART Implementation Figure 7-5.GART SRAM Timings 7.1.4Coherency 7.2AGP Traffic 7.2.2Traffic Priority 7.2.3Coherency, Translation and Types of AGP Traffic Table 7-1.Coherency for AGP/PCI Streams 7.2.4Ordering Rules 7.2.5Processor Locks and AGP Traffic 7.2.6Address Alignment and Transfer Sizes 7.2.6.1Address Faults 7.2.7PCI Semantics Traffic 7.2.7.1Inbound Reads Delayed Transactions 7.2.7.2PCI Stream Read Prefetching 7.2.7.3Inbound Reads Directed To Memory 7.2.7.4Inbound Delayed Read Matching Rules Table 7-2.Delayed Read Matching Criteria 7.2.7.5Inbound I/O Reads 7.2.7.6Inbound Writes Writes to Memory 7.2.7.7Inbound I/O Writes 7.2.7.8Retry/Disconnect Conditions 7.2.7.9Outbound Reads 7.2.7.10Outbound Writes Write Combining This holds true for all memory attributes, not just WC 7.3Bandwidth 7.4Latency 7.5GXB Address Map Page Page WXB Hot-Plug 8.1IHPC Configuration Registers Table 8-1.IHPC Configuration Register Space 8.1.1Page Number List for the IHPC PCI Register Descriptions Page 8.1.2VID: Vendor Identification Register 15:0 Vendor Identification Number 8.1.3DID: Device Identification Register 8.1.4PCICMD: PCI Command Register 9Fast Back-to-BackEnable 8SERR# Enable 7Wait Cycle Control 6Parity Error Enable 8.1.5PCISTS: PCI Status Register 15Detected Parity Error 14Signaled System Error 13Received Master Abort 12Received Target Abort 8.1.7CLASS: Class Register 23:16 Base Class 15:8 Sub-Class 7:0 Register-levelProgramming Interface 8.1.8CLS: Cache Line Size 8.1.11Base Address 31:8 Base Address 7:4 Indicate 256-byteAddress Space Requested 3Not Prefetchable Hardwired Value Type: 8.1.15Interrupt Pin 8.1.16Hot-PlugSlot Identifier 8.1.17Miscellaneous Hot-PlugConfiguration 8.1.18Hot-PlugFeatures 8.1.19Switch Change SERR Status 8.1.20Power Fault SERR Status 8.2IHPC Memory Mapped Registers Table 8-2.IHPC Memor Mapped Register Space 8.2.1Page Number List for IHPC Memory Mapped Register Descriptions 8.2.2Slot Enable 5Enable Slot F 4Enable Slot E 3Enable Slot D 8.2.3Hot-PlugMiscellaneous 8.2.4LED Control 8.2.5Hot-PlugInterrupt Input and Clear 8.2.6Hot-PlugInterrupt Mask 8.2.7Serial Input Byte Data 8.2.8Serial Input Byte Pointer 8.2.9General Purpose Output 8.2.10Hot-Plug Non-interruptInputs 8.2.11Hot-PlugSlot Identifier 8.2.12Hot-PlugSwitch Interrupt Redirect Enable 8.2.13Slot Power Control 8.2.14Extended Hot-PlugMiscellaneous IFB Register Mapping 9.1PCI / LPC / FWH Configuration Page 9.2IDE Configuration 9.3Universal Serial Bus (USB) Configuration 9.4SMBus Controller Configuration Page IFB Usage Considerations 10.1Usage of 1MIN Timer in Power Management 10.2Usage of the SW SMI# Timer 10.3CD-ROMAUTO RUN Feature of the OS 10.4ACPI, SMBus, GPIO Base Address Reporting to the 10.5Ultra DMA Configuration The Ultra DMA The Ultra DMA Cycle Time Field 10.5.3Determining a Drive’s Transfer Rate Capabilities 10.5.3.1Overview Table 10-1.Identify Device Information Used for Determining Drive Capabilities Page 10.5.4Determining a Drive’s Best Ultra DMA Capability Determining a Drive’s Best Multi Word DMA/Single Word DMA Page 10.5.5.1Determining a Drive’s Best PIO Capability Table 10-6.Drive PIO Capability as a Function of Cycle Time 10.5.6IFB Timing Settings 10.5.6.1DMA/PIO Timing Settings Table 10-7.IFB Drive Mode Based on DMA/PIO Capabilities Table 10-8.IDE Mode/Drive Feature Settings for Optimal DMA/PIO Operation Table 10-9.DMA/PIO Timing Values Based on PIIX Cable Mode/System Speed 10.5.6.2Ultra DMA Timing Settings Table 10-10.Ultra DMA Timing Value Based on Drive Mode 10.5.7Drive Configuration for Selected Timings Table 10-11.Ultra DMA/Multi Word DMA/Single Word Transfer/Mode Values Table 10-12.PIO Transfer/Mode Values 10.5.7.1BMIS1 - Bus Master IDE Status Register (Primary: Bus Master IDE Base I/O Address + Offset 02h) 10.5.7.2BMIS2 - Bus Master IDE Status Register 10.5.8Settings Checklist Table 10-13.Drive Capabilities Checklist Table 10-14.IFB Settings Checklist 10.5.9Example Configurations 10.5.9.1Example #1: Ultra DMA/33 Configuration 10.5.9.2Example #2: Mixed Ultra DMA/33 and Non-ultraDMA/33 Configuration 10.5.9.3Example #3: Non Ultra DMA/33 Drive Configuration 10.5.10Ultra DMA System Software Considerations 10.5.11Additional Ultra DMA/PCI Bus Master IDE Device Driver Considerations 10.5.11.1Bus Master IDE Command and Status Register 10.5.11.2BMICX–BusMaster IDE Command Register (I/O) 10.5.11.3BMISX–BusMaster IDE Status Register (I/O) 10.6USB Resume Enable Bit Page LPC/FWH Interface Configuration 11.1PCI to LPC/FWH Interface Configuration Space Registers (PCI Function 0) 11.1.3PCICMD–PCICommand Register (Function 0) 11.1.4PCISTS–PCIDevice Status Register (Function 0) 11.1.5RID–RevisionIdentification Register (Function 0) 11.1.6CLASSC–ClassCode Register (Function 0) 11.1.7HEDT–HeaderType Register (Function 0) 11.1.8ACPI Base Address (Function 0) 11.1.9ACPI Enable (Function 0) 11.1.10SCI IRQ Routing Control 11.1.11BIOSEN–BIOSEnable Register (FUNCTION 0) 11.1.12PIRQRC[A:D]–PIRQxRoute Control Registers (Function 0) 11.1.13SerIRQC–SerialIRQ Control Register (Function 0) 11.1.14TOM–Topof Memory Register (Function 0) 11.1.15MSTAT–MiscellaneousStatus Register (Function 0) 11.1.16Deterministic Latency Control Register (Function 0) 11.1.17MGPIOC–MuxedGPIO Control (Function 0) 11.1.18PDMACFG–PCIDMA Configuration Resister (Function O) 11.1.19DDMABP–DistributedDMA Slave Base Pointer Registers (Function 0) 11.1.20RTCCFG–RealTime Clock Configuration Register (Function 0) 11.1.21GPIO Base Address (FUNCTION 0) 11.1.22GPIO Enable (FUNCTION 0) 11.1.23LPC COM Decode Ranges (Function 0) 11.1.24LPC FDD/LPT Decode Ranges (Function 0) 11.1.25LPC Sound Decode Ranges (Function 0) 11.1.26LPC Generic Decode Range (Function 0) 11.1.27LPC Enables (Function 0) 11.1.27.1Firmware Hub (FWH) Decode Enable Register 11.1.27.2Firmware Hub (FWH) Select Register 11.2PCI to LPC I/O Space Registers 11.2.1.2Dcm–DmaChannel Mode Register (I/O) 11.2.1.3Dr–DmaRequest Register (I/O) 11.2.1.4WSMB–WriteSingle Mask Bit (I/O) 11.2.1.5RWAMB–Read /Write All Mask Bits (I/O) 11.2.1.6Ds–DmaStatus Register (I/O) 11.2.1.7DBADDR–DMABase and Current Address Registers (I/O) 11.2.1.8DBCNT–DmaBase and Current Count Registers (I/O) 11.2.1.9DLPAGE–DMALow Page Registers (I/O) 11.2.1.10DCBP–DmaClear Byte Pointer Register (I/O) 11.2.1.11Dmc–DmaMaster Clear Register (I/O) 11.2.1.12Dclm–DmaClear Mask Register (I/O) 11.2.2Interrupt Controller Registers 11.2.2.1Icw1–InitializationCommand Word 1 Register (I/O) 11.2.2.2Icw2–InitializationCommand Word 2 Register (I/O) 11.2.2.3Icw3–InitializationCommand Word 3 Register (I/O) 11.2.2.4Icw3–InitializationCommand Word 3 Register (I/O) 11.2.2.5Icw4–InitializationCommand Word 4 Register (I/O) 11.2.2.6Ocw1–OperationalControl Word 1 Register (I/O) 11.2.2.7Ocw2–OperationalControl Word 2 Register (I/O) 11.2.2.8Ocw3–OperationalControl Word 3 Register (I/O) 11.2.2.9Elcr1–Edge/LevelControl Register (I/O) 11.2.2.10Elcr2–Edge/LevelControl Register (I/O) 11.2.3Counter/Timer Registers 11.2.3.1Tcw–TimerControl Word Register (I/O) Read Back Command Counter Latch Command 11.2.3.2TMRSTS–TimerStatus Registers (I/O) 11.2.3.3TMRCNT–TimerCount Registers (I/O) 11.2.4NMI Registers 11.2.4.1Nmisc–NmiStatus and Control Register (I/O) NmiEN–Nmi 11.2.5Real Time Clock Registers RTCI–Real-time 11.2.5.2RTCD–Real-timeClock Data Register (I/O) 11.2.5.3RTCEI–Real-timeClock Extended Index Register (I/O) 11.2.5.4RTCED–Real-timeClock Extended Data Register (I/O) 11.2.6Advanced Power Management (APM) Registers 11.2.6.1APMC–AdvancedPower Management Control Port (I/O) 11.2.6.2APMS–AdvancedPower Management Status Port (I/O) 11.2.7ACPI Registers 11.2.7.1Power Management 1 Status 11.2.7.2Power Management 1 Enable 11.2.7.3Power Management 1 Control 11.2.7.4Power Management 1 Timer 11.2.7.5General Purpose 0 Status 11.2.7.6General Purpose 0 Enable 11.2.7.7General Purpose 1 Status 11.2.7.8General Purpose 1 Enable 11.2.8SMI Registers 11.2.8.1Global Control and Enable 11.2.8.2Global Status Register 11.2.9General Purpose I/O Registers 11.2.9.1GP Output GP Data 11.2.9.3GP TTL GP Blink 11.2.9.5GP Lock GP Invert GP SMI GP Pulse GP Core 11.2.9.10GP Pull-up Page IDE Configuration 12.1PCI Configuration Registers (Function 1) 12.2IDE Controller Register Descriptions (PCI Function 1) 12.2.1VID–VendorIdentification Register (Function 1) 12.2.2DID–DeviceIdentification Register (Function 1) 12.2.3PCICMD–PCICommand Register (Function 1) 12.2.4PCISTS–PCIDevice Status Register (Function 1) 12.2.5CLASSC–ClassCode Register (Function 1) 12.2.6MLT–MasterLatency Timer Register (Function 1) 12.2.7BMIBA–BusMaster Interface Base Address Register (Function 1) 12.2.8SVID–SubsystemVendor ID (Function 1) 12.2.9SID–SubsystemID (Function 1) 12.2.10IDETIM–IDETiming Register (Function 1) 12.2.11SIDETIM–SlaveIDE Timing Register (Function 1) 12.2.12DMACTL–SynchronousDMA Control Register (Function 1) 12.2.13SDMATIM–SynchronousDMA Timing Register (Function 1) 12.3IDE Controller I/O Space Registers 12.3.2BMISx–BusMaster IDE Status Register (I/O) Table 12-4.Interrupt/Activity Status Combinations 12.3.3BMIDTPx–BusMaster IDE Descriptor Table Pointer Register (I/O) Page Universal Serial Bus (USB) Configuration 13.1PCI Configuration Registers (Function 2) 13.2USB Host Controller Register Descriptions (PCI Function 2) 13.2.4PCISTS–PCIDevice Status Register (Function 2) 13.2.5RID–RevisionIdentification Register (Function 2) 13.2.6CLASSC–ClassCode Register (Function 2) 13.2.7MLT–MasterLatency Timer Register (Function 2) 13.2.8HEDT–HeaderType Register (Function 2) 13.2.9USBBA–USBI/O Space Base Address (Function 2) 13.2.10SVID–SubsystemVendor ID (Function 2) 13.2.11SID–SubsystemID (Function 2) 13.2.12INTLN–InterruptLine Register (Function 2) 13.2.13INTPN–InterruptPin (Function 2) 13.2.14Miscellaneous Control (Function 2) 13.2.15SBRNUM–SerialBus Release Number (Function 2) 13.2.16LEGSUP–LegacySupport Register (Function 2) Page 13.3USB Host Controller I/O Space Registers Table 13-2.Run/Stop, Debug Bit Interaction 13.3.2USBSTS–USBStatus Register (I/O) 13.3.3USBINTR–USBInterrupt Enable Register (I/O) 13.3.4FRNUM–FrameNumber Register (I/O) 13.3.5FLBASEADD–FrameList Base Address Register (I/O) 13.3.6SOFMOD–Startof Frame (SOF) Modify Register (I/O) 13.3.7PORTSC–PortStatus and Control Register (I/O) Page Page SM Bus Controller Configuration 14.1SM Bus Configuration Registers (Function 3) 14.2System Management Register Descriptions 14.2.4PCISTS–PCIDevice Status Register (Function 3) 14.2.5RID–RevisionIdentification Register (Function 3) 14.2.6CLASSC–ClassCode Register (Function 3) 14.2.7SMBBA–SMBusBase Address (Function 3) 14.2.8SVID–SubsystemVendor ID (Function 3) 14.2.9SID–SubsystemID (Function 3) 14.2.10INTLN–InterruptLine Register (Function 3) 14.2.11INTPN–InterruptPin (Function 3) 14.2.12Host Configuration 14.3SMBus I/O Space Registers 14.3.1smbhststs–SMBusHost Status Register (I/O) 14.3.2smbslvsts–SMBusSlave Status Register (I/O) 14.3.3smbhstcnt–SMBusHost Control Register (I/O) 14.3.4smbhstcmd–SMBusHost Command Register (I/O) 14.3.5smbhstadd–SMBusHost Address Register (I/O) 14.3.6smbhstdat0–SMBusHost Data 0 Register (I/O) 14.3.7smbhstdat1–SMBusHost Data 1 Register (I/O) 14.3.8smbblkdat–SMBusBlock Data Register (I/O) 14.3.9smbslvcnt–SMBusSlave Control Register (I/O) 14.3.9.1 10.3.10.smbshdwcmd–SMBusShadow Command Register (I/O) 14.3.9.210.3.11.smbslvevt–SMBusSlave Event Register (I/O) 14.3.10smbslvdat–SMBusSlave Data Register (I/O) Page PCI/LPC Bridge Description 15.1PCI Interface 15.2Interrupt Controller 15.2.1Programming the Interrupt Controller 15.2.1.1Initialization Command Words (ICWs) 15.2.1.2Operation Command Words (OCWs) 15.2.2End of Interrupt Operation 15.2.2.1End of Interrupt (EOI) 15.2.2.2Automatic End of Interrupt (AEOI) Mode 15.2.3Modes of Operation 15.2.3.1Fully Nested Mode 15.2.3.2The Special Fully Nested Mode 15.2.3.3Automatic Rotation (Equal Priority Devices) 15.2.3.4Specific Rotation (Specific Priority) 15.2.4Cascade Mode 15.2.5Edge and Level Triggered Mode 15.2.6Interrupt Masks 15.2.6.1Masking on an Individual Interrupt Request Basis 15.2.6.2Special Mask Mode 15.2.7Reading the Interrupt Controller Status 15.2.8Interrupt Steering 15.3Serial Interrupts Table 15-1.SERIRQ Frames 15.3.1.4Stop Frame 15.4Timer/Counters 15.4.1.1Write Operations 15.4.1.2Interval Timer Control Word Format 15.4.1.3Read Operations 15.4.1.4Counter I/O Port Read 15.4.1.5Counter Latch Command 15.5Real Time Clock 15.5.1RTC Registers and RAM Table 15-2.RTC (Standard) RAM Bank Register A Register B Register C Register D 15.5.2RTC Update Cycle 15.5.3RTC Interrupts 15.5.4Lockable RAM Ranges Page IFB Power Management 16.1Overview 16.2IFB Power Planes 16.2.3SCI Generation Table 16-3.Causes of SCI# 16.2.4Sleep States 16.2.5ACPI Bits Not Implemented by IFB Table 16-4.ACPI Bits Not Implemented in IFB 16.2.6Entry/Exit for the S4 and S5 States 16.3Handling of Power Failures in IFB