RAS Features, GXB Features | Intel 460GX specification

1.5.2 WXB Features

Supports the I/O and Firmware Bridge (IFB).

Supports two delayed inbound read requests.

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• Supports either internal or external arbitration, allowing additional bus masters, on the PCI bus.

— Combines back-to-back sequential processor-to-PCI memory writes to PCI burst writes.

— Processor to PCI write assembly of full/partial line writes.

• Two outbound read requests containing a total of two cache lines of read data for each PCI bus.

• Supports six outbound write requests containing a total of three cache lines of write data for each 32 bit PCI bus. Supports 12 outbound write requests containing a total of six cache lines of write data for a 64 bit PCI bus.

Parity protection on all PCI signals. Data collection & write assembly.

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Introduction

•Support for two 64 bit, 66 MHz PCI busses.

•3.3 Volt PCI bus operation (supports Universal and 3.3 Volt PCI cards).

•PCI Specification, Revision 2.2.

•Integrated Hot-Plug controller.

1.5.3GXB Features

•The GXB is AGP and AGP 4X mode compatible, nominal 66 MHz, 266 MHz, 1 GB/s peak bandwidth.

•The GXB supports pipelined operation or sideband signals on AGP 4X mode bus.

•AGP address space of 1 GB or 256 MB supported. Also supports 32 GB of GART window, if 4 MB pages are used.

•Supports Fast Writes and 1x, 2x and 4x data rates.

1.6RAS Features

• ECC coverage of system data bus using the Itanium™ processor SEC/DED ECC code. Memory is protected using a SEC/DED code which also provides nibble detection capabilities of 4 bits. All control and address signals are parity protected. Local control buses are parity protected. The Expander is covered by parity.

•Data flows protected by parity throughout chipset.

•ECC bits in DRAM accessible by diagnostics.

•Fault recording of multiple errors; sticky through reset, but NOT through power-down.

•Memory scrubbing implemented in hardware.

•Boundary test capability through JTAG.

•JTAG TAP port for debug.

Intel® 460GX Chipset Software Developer’s Manual

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Intel 460GX manual RAS Features, GXB Features

Contents

Intel 460GX Chipset System Software Developer’s Manual Intel 460GX Chipset System Software Developer’s Manual Contents Coherency 10.1 Latency 10-1 11-8 13.2.4 Figures Tables 12-11 System Overview Introduction Name Function Component OverviewIntel 460GX Chipset Components Itanium Processor System Bus Support Product Features I/O Support PXB FeaturesDram Interface Support GXB Features RAS Features Reference Documents Other Platform Components1 I/O & Firmware Bridge IFB Programmable Interrupt Device PID Date Description June Initial release Revision History Introduction Register Descriptions Access Mechanism Partitioning Access RestrictionsDevice Mapping on Bus CBN Device Register Attributes Default Upon ResetReserved Bits Defined in Registers Reserved or Undefined Register Locations I/O Mapped Registers Configaddress Configuration Address RegisterConsistency Gart Programming Region Configdata Configuration Data Register Error Handling Registers1 SAC 1.1 1.2 Bits Description Disable1.3 Valid Ferrsac First Error Status Register Nerrsac All Error Status Register Biuitid BIU Itid Register Saferr System Address on First Error Address bits Biudata BIU Data Register 2.1 SEC0DFERR Data on First Memory Card B SEC 2 SDC2.2 SEC0ECCFERR ECC on First Memory Card B SEC 2.3 SEC0TXINFOFERR Txinfo on First Memory Card B SEC 2.5 DED0ECCFERR ECC on First Memory Card B DED 2.4 DED0DFERR Data on First Memory Card B DED2.6 DED0TXINFOFERR Txinfo on First Memory Card B DED 2.7 SEC1DFERR Data on First Memory Card a SEC 2.10 DED1DFERR Data on First Memory Card a DED 2.8 SEC1ECCFERR ECC on First Memory Card a SEC2.9 SEC1TXINFOFERR Txinfo on First Memory Card a SEC 2.12 DED1TXINFOFERR Txinfo on First Memory Card a DED Sdcferr First Error Status Register2.11 DED1ECCFERR ECC on First Memory Card a DED 21 ’Forward’ Underflow Card a Left Stack Error FL1 22 ’Forward’ Underflow Card a Right Stack Error FR115 ’Forward’ Underflow Card B Right Stack Error FR0 14 ’Forward’ Underflow Card B Left Stack Error FL0 Pitidferr Data on First Pitid Parity Error Sdcnerr SDC Next Error Status RegisterPcmdferr Command on First Pcmd Parity Error ECCMSK0 ECC Mask Register Card B Sdcrspferr Response on First Sdcrsp ErrorDpbrleferr Private Data Bus Receive Length Error Eccmskf ECC Mask Register ParMskP PB Parity Mask and IB Correction Enable RegisterECCMSK1 ECC Mask Register Card a Pvdtxinfoferr Txinfo on First PVD Parity Error Pvddferr Data on First PVD Parity ErrorPvdparferr Parity on First PVD Parity Error Secfeccferr ECC on First System Bus SEC Secfdferr Data on First System Bus SECSecftxinfoferr Txinfo on First System Bus SEC Dedfdferr Data on First System Bus DED Que-Overflow Error Ferrmac First Error Status Register3 MAC Dedfeccferr ECC on First System Bus DED 4 PXB Cmndferr Command on First ErrorErrsts Error Status Register Errcmd Error Command Register 5 GXB Ferragp First Error Status Register for AGP5.1 Ferrpci Nerragp Next Errors Status Register for AGP Ferrgart First Error Status Register for Gart Nerrgart Pacerr PCI Address & Cmd First ErrorPderr PCI Data First Error Fepci Register Records an PCI Bus Error Flag Nepci Register Records an PCI Bus Error Flag6 WXB Bits Description Intrq Asserted Flag Fepci PCI Bus First Error Status Register Nepci PCI Bus Next Error Status Register Fepcidl PCI First Error Data Log Fepcial PCI First Error Address/Command LogPerformance Monitor Registers 6764 C/BE30 6332 AD6332 310 AD310 Count Value OverflowLength Encodings Dmask Encodings Event Select Umask Encodings Reload Control Disable SourceEnable Source 2 SDC FSBDPMD1,0 System Bus Performance Monitor Data Registers 3.2 PMR10 Performance Monitoring Response 3 PXB3.1 PMD10 Performance Monitoring Data Register 3.3 PME10 Performance Monitoring Event Selection Reload ModeCount Data Cycles Initiating Agent Selection AGPPMD0,1 AGP Performance Monitor Data Registers 4 GXB Event 1 Input Pcipmd PCI Performance Monitor Data RegistersPercon Performance Monitor Control Register Pipe or Sideband Request Mask AGPPMC0,1 AGP Performance Monitor Configuration RegisterEvent 0 Input Initiating Agent Pcipmc PCI Performance Monitor Configuration RegisterEVENT1 Count Enable Disable Source 5 WXB PCIWXBPMC0 PCI Performance Monitor Configuration RegisterData Transfer and Transaction Qualifier Issuing Agent Qualifier Xtprs External Task Priority Registers PCIWXBPMC1 PCI Performance Monitor Configuration RegisterInterrupt Related Registers PID PCI Memory-mapped Registers Address Name Access Default Value2.1 I/O Register Select Register FEC00000h Memory-Mapped Register Summary 2.2 I/O Window Register FEC00010h PID Indirect Access RegistersXAPIC EOI Register FEC00040h I/O Window Register Format RTE Offset Name Access Default Value3.1 I/O xAPIC ID Register 00h Memory-mapped Register Summary Cont’d 3.3 I/O xAPIC Arbitration ID Register 02h 3.2 I/O xAPIC Version Register 01hI/O Apic ID Register Format I/O xAPIC Version Register Format 3.4 I/O xAPIC RTE 10h-8Fh Bits Sapic Mode Apic Mode Description NameI/O xAPIC Arbitration ID Register Format 10. I/O xAPIC RTE Format 10. I/O xAPIC RTE Format Cont’d Sapic Mode Apic Mode Description Name Vector Destination Processor Coherency System ArchitectureCoherency AGP Coherency OrderingPCI Coherency Arbitration for Inbound Transactions WXB ArbitrationWXB Arbitration at the PCI Bus Indivisible Operations Big-endian SupportProcessor Locks Arbitration for Outbound Transactions Atomic Writes Inbound PCI LocksAtomic Reads Locks with AGP Non-coherent Traffic WXB PCI Hot-Plug Support Interrupt Delivery Slot Power-down and Disable Slot Power-up and Enable System Architecture Compatibility Region System Address MapMemory Map System Memory Address Space System Firmware Medium Extended Memory Region Low Extended Memory Region Variable GAP High Extended Memory above 4GRe-mapped Memory Areas Itanium Processor and Chipset-specific Memory Space I/O Address Map System I/O Address Space High PXB must ignore GXB must BINIT# after Gart Devices View of the System Memory Map Address Range Outbound Inbound Dest. Decision Legal and Illegal Address DispositionAddress Disposition Main memory if present above 4 GB Address Disposition Cont’dAbove TOM Binit System Address Map Memory Subsystem General Memory CharacteristicsOrganization System Maximum Memory Configuration Using Two Cards Technology & Configuration Size Minimum/Maximum Memory Size per ConfigurationDimm Types Double Number Memory Size Address Interleaving Interleaving/Configurations Bandwidth Summary of Configuration RulesNon-uniform Memory Configurations Memory Subsystem Clocking Supporting FeaturesAuto Detection Removing a Bad Row Memory Scrubbing Hardware InitializationScrubbing Time Memory Size Time to Scrub Memory Subsystem System Bus Data Integrity and Error HandlingIntegrity Expander Buses DramPCI Buses 5 AGP Data Poisoning Usage of First-error and Next-errorMemory ECC Routing INTREQ# Masked BitsBERR#/BINIT# Generation Data ECC or Parity Errors SAC/SDC ErrorsXBINIT# XSERR# SAC to SDC Interface Errors System Bus Errors 5 SDC/Memory Card Interface Errors SAC to MAC Interface Errors SDC Internal Errors Error Determination6 SDC/System Bus Errors SAC Address on an Error Special Notes on Usage of SECTID, DEDTID, Fsetid Registers SDC Logging Registers 1 SAC/SDC Error Clearing Clearing ErrorsMultiple Errors ERR ERR SDC Multiple Errors Error Anomalies SAC Multiple ErrorsSingle Errors with Multiple Reporting SAC Error Flow on Data Data Flow Errors Table of Errors Error Conditions System Bus ADD/CMND Error CasesSAC to SDC Interface Errors Error Cases Cont’d Internal SDC Error Detected as PCI Master PXB Errors PCI Bus Monitoring PCI IntegrityPXB as Master Master Abort PXB as Target Target Abort GXB Error FlowTarget Retry GXB Errors GXB Error Signals Gart Interface Errors GXB Error Flow Multiple Errors Usage of First Error and Next Error Registers WXB Data Integrity and Error HandlingIntegrity Data Parity Poisoning Error Steering/Signaling Error Mask BitsSupported Error Escalation to XBINIT#a Abbreviation Error Supported Error Escalation to PA/BINTRQ# Supported Error Escalation to SERROUT#aSERR# Generation Escalation XBINIT# Generation Error Determination and LoggingINTRQ# Interrupt WXB as Bus Master Error Conditions Other Violations WXB as Target Discard Timer Expiration PCI Interface ErrorsSystem Error Signaled Graphics Address Relocation Table Gart AGP Subsystem 24b 12b22b 14b Gart Entry Format for 4kB Pages Gart Implementation Sizes Programming GartGtlb Parity SE2 ADSC# ADSP# ADV# LBO# SB# SW# CoherencySGW# AGP Traffic 4.1 3.3V AGP 1X and 2X Mode CompatibilityInterrupt Handling Addresses Used by the Graphics Card Coherency, Translation and Types of AGP Traffic Traffic Priority Coherency for AGP/PCI Streams Ordering RulesProcessor Locks and AGP Traffic Address Alignment and Transfer Sizes Address FaultsPCI Semantics Traffic Inbound Reads Inbound Reads Directed To Memory Inbound Delayed Read Matching RulesPCI Stream Read Prefetching Command Address BEs Delayed Read Matching CriteriaInbound I/O Reads Inbound Writes Outbound Writes Retry/Disconnect ConditionsOutbound Reads Fast Back-to-Back Transactions Transfer Data Length Combining Supported Used ModeBurst Write Combining Modes 1st write 2nd write 3rd write Transferred as GXB Address Map LatencyInbound Read Prefetching Bandwidth Estimates for Various Request Sizes AGP Subsystem AGP Subsystem WXB Hot-Plug Ihpc Configuration Registers Ihpc Configuration Register Space Did Device Identification Register Number List for the Ihpc PCI Register DescriptionsVID Vendor Identification Register Pcicmd PCI Command Register RID Revision Identification Register Pcists PCI Status Register Class Class Register MLT Master Latency Timer RegisterCLS Cache Line Size HDR Header Register Svid Subsystem Vendor Identification Base AddressSID Subsystem ID Interrupt Line Hot-Plug Slot Identifier Miscellaneous Hot-Plug ConfigurationInterrupt Pin Power Fault Serr Status Hot-Plug FeaturesSwitch Change Serr Status Memory Mapped Register Access Port Memory Access IndexIhpc Memory Mapped Registers Arbiter Serr Status M66EN Ihpc Memor Mapped Register Space Number List for Ihpc Memory Mapped Register Descriptions Slot Enable LED Control Hot-Plug Miscellaneous Hot-Plug Interrupt Input and Clear Hot-Plug Interrupt Mask Serial Input Byte Data Hot-Plug Non-interrupt Inputs Serial Input Byte PointerGeneral Purpose Output Extended Hot-Plug Miscellaneous Hot-Plug Switch Interrupt Redirect EnableSlot Power Control PCI Configuration Registers Function PCI / LPC / FWH ConfigurationMnemonic Register Register Access IFB Register Mapping Pcists BiosenClassc Hedt PCI Configuration Registers-Function 1 IDE Interface IDE Configuration Configuration Offset Mnemonic Register Universal Serial Bus USB ConfigurationPCI Configuration Registers-Function 2 USB Interface SMBus Configuration Registers Function SMBus Controller Configuration IFB Register Mapping Usage of the SW SMI# Timer Usage of 1MIN Timer in Power ManagementCD-ROM Auto RUN Feature of the OS IFB Usage Considerations Reserved Secondary Primary Drive Ultra DMA Mode Enable Ultra DMA ConfigurationDisabled Enabled SSDE1 SSDE0 PSDE1 PSDE0 Overview Determining a Drive’s Transfer Rate CapabilitiesCapability Word Bits Field Offset Ultra DMA Fields that Indicate Ultra DMA Drive Capabilities PIO Capability Word BitsDMA Capability Word Bits Field Determining a Drive’s Best Ultra DMA Capability 10-6 Capability Word Offset Bits Field150 Minimum Multi Word DMA Transfer Cycle Time per Determining a Drive’s Best PIO Capability Drives Reported DMA Drive’s Best DMA Mode Cycle Time Drive PIO Capability as a Function of Cycle Time Drives Reported PIO Drive’s Best PIO Mode 10.5.6.1 DMA/PIO Timing Settings IFB Timing SettingsIFB Drive Mode Based on DMA/PIO Capabilities Mode Yes Disabled Enabled DMA Mode Iordy If fixed disk DMA Iordy IDE Ultra DMA Timing Settings Drive Configuration for Selected Timings10. Ultra DMA Timing Value Based on Drive Mode DMA/PIO Timing Values Based on Piix Cable Mode/System Speed 10-12 12. PIO Transfer/Mode ValuesDrive’s Selected PIO Speed Capability 13. Drive Capabilities Checklist Settings Checklist Example #1 Ultra DMA/33 Configuration Example Configurations14. IFB Settings Checklist Register Type Offset Value Comments 40-41h E377h Mode config. for Primary IDE Timing Register Example #3 Non Ultra DMA/33 Drive Configuration4A-4Bh 0002h Ultra DMA mode config 44h 0Bh Ultra DMA Control Register 10-16 Ultra DMA System Software Considerations4A-4Bh 0000h Intel 460GX Chipset Software Developer’s Manual 10-17 BMISX-Bus Master IDE Status Register I/O Bit Description Reserved. This bit is hardwired toBit Description Completed or halted Bit Type Description USB Resume Enable Bit 10-20 DID-Device Identification Register Function LPC/FWH Interface ConfigurationVID-Vendor Identification Register Function PCISTS-PCI Device Status Register Function PCICMD-PCI Command Register Function CLASSC-Class Code Register Function RID-Revision Identification Register FunctionHEDT-Header Type Register Function Bit SCI IRQ Routing Control Acpi Enable FunctionAcpi Base Address Function PIRQRCAD-PIRQx Route Control Registers Function BIOSEN-BIOS Enable Register Function TOM-Top of Memory Register Function SerIRQC-Serial IRQ Control Register Function Deterministic Latency Control Register Function MSTAT-Miscellaneous Status Register Function Bits Description PDMACFG-PCI DMA Configuration Resister Function OMGPIOC-Muxed Gpio Control Function Base Offset Channel RTCCFG-Real Time Clock Configuration Register Function Gpio Base Address Function Gpio Enable FunctionLPC COM Decode Ranges Function Bits Decode Range 000 LPC FDD/LPT Decode Ranges Function011 110 LPC Generic Decode Range Function LPC Sound Decode Ranges Function220 233 240 253 260 273 280 293 11-12 Firmware Hub FWH Decode Enable Register LPC Enables FunctionReserved. This bit must be a 1413 Reserved Firmware Hub FWH Select Register Dcom-Dma Command Register I/O Test Mode RegisterPCI to LPC I/O Space Registers DMA Registers Dr-Dma Request Register I/O Dcm-Dma Channel Mode Register I/O Bit Description Reserved. Must be WSMB-Write Single Mask Bit I/ORWAMB-Read / Write All Mask Bits I/O DBADDR-DMA Base and Current Address Registers I/O Ds-Dma Status Register I/O DBCNT-Dma Base and Current Count Registers I/O When counting down a DMA transferDLPAGE-DMA Low Page Registers I/O DCBP-Dma Clear Byte Pointer Register I/O Interrupt Controller Registers 11.2.2.1 Icw1-Initialization Command Word 1 Register I/ODmc-Dma Master Clear Register I/O Dclm-Dma Clear Mask Register I/O Bit Description Reserved. Must be programmed to all 0s 11.2.2.2 Icw2-Initialization Command Word 2 Register I/O11.2.2.3 Icw3-Initialization Command Word 3 Register I/O 11.2.2.5 Icw4-Initialization Command Word 4 Register I/O 11.2.2.4 Icw3-Initialization Command Word 3 Register I/O11.2.2.6 Ocw1-Operational Control Word 1 Register I/O 11-22 11.2.2.8 Ocw3-Operational Control Word 3 Register I/O 11.2.2.7 Ocw2-Operational Control Word 2 Register I/O Elcr1-Edge/Level Control Register I/O Tcw-Timer Control Word Register I/O Counter/Timer RegistersElcr2-Edge/Level Control Register I/O Bit Decription 5. When bit 3=0, status and/or count will not be latched Latched. When bit 4=1, the status will not be latched5. When bit 2=0, status and/or count will not be latched 5. When bit 1=0, status and/or count will not be latched TMRCNT-Timer Count Registers I/O TMRSTS-Timer Status Registers I/O Nmisc-Nmi Status and Control Register I/O NMI Registers Real Time Clock Registers NMI Enable. Used by IFB NMI logicRTCD-Real-time Clock Data Register I/O Used for NMI enabling/disabling. See description in Section APMC-Advanced Power Management Control Port I/O Advanced Power Management APM RegistersRTCEI-Real-time Clock Extended Index Register I/O RTCED-Real-time Clock Extended Data Register I/O Acpi Registers APMS-Advanced Power Management Status Port I/OPower Management 1 Status Power Management 1 Control Power Management 1 EnableStates can be supported in external logic 11-32 Bit Description Bits Mode Power Management 1 TimerGeneral Purpose 0 Status 3124 Reserved 230 Power up, this bit is set to ‘1’ General Purpose 0 Enable1512 Reserved CF9 write General Purpose 1 Status General Purpose 1 EnableSMI Registers Port at B2h in I/O space Global Control and EnableStatus Register is set Thrmsts bit Global Status Register General Purpose I/O RegistersGPIO8 GPIO7 GP Data GP Output 1916 GP TTL159 Reserved Bit is set GP Invert GP BlinkGP Lock GP Pulse GP SMIGP Core GP Pull-up 11-42 PCI Configuration Registers Function IDE ConfigurationConfiguration Mnemonic Register IDE Controller Register Descriptions PCI Function Wait Cycle Control. This bit is hardwired to SERR# Enable. This bit is hardwired toParity Error Response. This bit is hardwired to VGA Palette Snoop. This bit is hardwired to By writing a 1 to this bit SERR# Status. Read as Bus Master interface registers and correspond to AD154 MLT-Master Latency Timer Register FunctionBMIBA-Bus Master Interface Base Address Register Function IDETIM-IDE Timing Register Function SVID-Subsystem Vendor ID FunctionSID-Subsystem ID Function SIDETIM-Slave IDE Timing Register Function Bit Description Reserved DMACTL-Synchronous DMA Control Register Function SDMATIM-Synchronous DMA Timing Register Function Ultra DMA/33 Timing Mode Settings BMICx-Bus Master IDE Command Register I/OIDE Controller I/O Space Registers Ultra DMA/33 Timing Modes BMISx-Bus Master IDE Status Register I/O 312 Interrupt/Activity Status CombinationsIs equal to the IDE device transfer size 12-12 Usbren Universal Serial Bus USB ConfigurationPCI Configuration Registers-Function Reserved. Read as USB Host Controller Register Descriptions PCI FunctionBit Description 1510 Reserved. Read Reserved. Read as 0’s Resets STA to 0 by writing a 1 to this bit 13-4 This fieldRegister in Function INTLN-Interrupt Line Register Function USBBA-USB I/O Space Base Address Function Miscellaneous Control Function INTPN-Interrupt Pin FunctionSBRNUM-Serial Bus Release Number Function LEGSUP-Legacy Support Register Function Needs to be serviced later Default to 1 for compatibility with older USB softwareAppropriate enable bits are set Accesses that are part of the sequence USB Host Controller I/O Space Registers USBREN-USB Resume EnableUSBCMD-USB Command Register I/O Swdbg Bit Run/Stop Bit Operation Run/Stop, Debug Bit InteractionStop=0, the Frnum register can be reprogrammed By Software or Hardware USBSTS-USB Status Register I/O USBINTR-USB Interrupt Enable Register I/OInterrupt is generated to the system Register = FRNUM-Frame Number Register I/O Address signalsFLBASEADD-Frame List Base Address Register I/O SOFMOD-Start of Frame SOF Modify Register I/O PORTSC-Port Status and Control Register I/O Asserted, the corresponding port is disabled X0 DisableEOF2 time See of the USB Specification Register define the hub states as follows 13-14 SM Bus Configuration Registers Function SM Bus Controller ConfigurationClass Code 0C-1Fh Reserved Base Address Register 14-2 System Management Register DescriptionsShutdown special cycle STA to 0 by writing a 1 to this bit 14-4 SMBBA-SMBus Base Address Function Interrupt pin PIRQB# is used Host Configuration SMBus I/O Space Registers Smbslvc-SMBus Slave Command FunctionSmbshdw1-SMBus Slave Shadow Port 1 Function Smbshdw2-SMBus Slave Shadow Port 2 Function Smbhststs-SMBus Host Status Register I/O Transaction errors are caused bySmbslvsts-SMBus Slave Status Register I/O Position Smbhstcnt-SMBus Host Control Register I/O Command field of SMBus host transaction Smbhstcmd-SMBus Host Command Register I/OSmbhstadd-SMBus Host Address Register I/O Smbhstdat0-SMBus Host Data 0 Register I/O Smbslvcnt-SMBus Slave Control Register I/O Smbhstdat1-SMBus Host Data 1 Register I/OSmbblkdat-SMBus Block Data Register I/O Smbslvdat-SMBus Slave Data Register I/O 14.3.9.1 Smbshdwcmd -SMBus Shadow Command Register I/O14.3.9.2 10.3.11.smbslvevt-SMBus Slave Event Register I/O Address 10h or one of the slave shadow port addresses 14-12 Interrupt Controller PCI/LPC Bridge DescriptionPCI Interface 15-2 Initialization Command Words ICWsProgramming the Interrupt Controller Automatic End of Interrupt Aeoi Mode Operation Command Words OCWsEnd of Interrupt Operation End of Interrupt EOI Special Fully Nested Mode Fully Nested ModeModes of Operation Automatic Rotation Equal Priority Devices Specific Rotation Specific Priority Cascade ModePoll Command Special Mask Mode Edge and Level Triggered ModeInterrupt Masks Masking on an Individual Interrupt Request Basis Interrupt Steering Reading the Interrupt Controller Status Continuous Idle Mode Quiet Active ModeSerial Interrupts Protocol Serirq Frames Stop FrameData Frame Number Usage # Clocks Past Start 3222 15-10 Timer/CountersProgramming the Interval Timer Write Operations Interval Timer Control Word Format Read Operations Counter Latch CommandCounter I/O Port Read 15-12 Real Time Clock Read Back Command Index Address Name RTC Registers and RAMRTC Standard RAM Bank 90625 ms 8125 ms 15.5.1.1 Register a1 Invalid 0 Invalid RSMRST# 15.5.1.2 Register B15.5.1.3 Register C RTC Interrupts RTC Update CycleLockable RAM Ranges 15.5.1.4 Register D 15-18 IFB Power States and Consumption IFB Power ManagementOverview Acpi State Description Power Plane Descriptions IFB Power Planes16.2.2 SMI# Generation Causes of SMI# Sleep States SCI GenerationCauses of SCI# SCI Event Comment Entry/Exit for the S4 and S5 States Acpi Bits Not Implemented by IFBAcpi Bits Not Implemented in IFB Offset Register Name/Function Comment S5 Wake Event Comment Handling of Power Failures in IFBAction after Power Returns 16-6