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Compaq EV68A Bcache Structure, Bcache Interface Signals, System Duplicate Tag Stores

Models: EV68A

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Bcache Structure

4.3 Bcache Structure

The 21264/EV68A Cbox provides control signals and an interface for a second-level cache (Bcache).

The 21264/EV68A supports a Bcache from 1MB to 16MB, with 64-byte blocks. A 128- bit bidirectional data bus is used for transfers between the 21264/EV68A and the Bcache. The Bcache is fully synchronous and the synchronous static RAMs (SSRAMs) must contain either one, two, or three internal registers. All Bcache control and address pins are clocked synchronously on Bcache cycle boundaries. The Bcache clock rate varies as a multiple of the CPU clock cycle in half-cycle increments from 1.5 to 4.0, and in full-cycle increments of 5, 6, 7, and 8 times the CPU clock cycle. The 1.5 multi- ple is only available in dual-data mode.

4.3.1 Bcache Interface Signals

Figure 4–2shows the 21264/EV68A system int erface signals.

Figure 4–2 21264/EV68A Bcache Interface Signals

BcData_H[127:0]

21264 BcCheck_H[15:0]

BcDataInClk_H[7:0]

BcDataOutClk_x[3:0]

BcDataOE_L

BcDataWr_L

BcAdd_H[23:4]

BcTag_H[42:20]

BcTagInClk_H

BcTagOutClk_x

BcVref

BcTagDirty_H

BcTagParity_H

BcTagShared_H

BcTagValid_H

BcTagOE_L

BcTagWr_L

BcLoad_L

FM-05650

4.3.2 System Duplicate Tag Stores

The 21264/EV68A provides Bcache state support for systems with and without dupli- cate tag stores, and will take different actions on this basis. The system sets the Cbox CSR DUP_TAG_ENA[0], indicating that it has a duplicate tag store for the Bcache.

Systems using the DUP_TAG_ENA[0] bit must also use the Cbox CSR BC_CLEAN_VICTIM[0] bit to avoid deadlock situations.

Systems using a Bcache duplicate tag store can accelerate system performance by:

21264/EV68A Hardware Reference Manual

Cache and External Interfaces 4–7

Image 95

Compaq EV68A specifications Bcache Structure, Bcache Interface Signals, System Duplicate Tag Stores

Contents

Compaq Computer Corporation Shrewsbury, Massachusetts Revision/Update Information21264/EV68A Hardware Reference Manual Table of Contents Cache and External Interfaces Hardware InterfaceInternal Processor Registers Privileged Architecture Library Code Mffpcr Mtfpcr Initialization and ConfigurationThermal Management Error Detection and Error HandlingTestability and Diagnostics Electrical Data21264/EV68A Boundary-Scan Register Alpha Instruction SetGlossary Index 21264/EV68A-to-Bcache Pin InterfaceFigures 10-2 Type 2 Heat Sink Tables Xiv VDD Idcpower Page Audience ContentPreface Documentation Included by Reference Abbreviations Terminology and ConventionsFor example Aligned and Unaligned W1CW1S AddressesExternal Signal NamesData Units Do Not CareUndefined Do not care. a capital X represents any valid value Page Introduction IntroductionArchitecture Floating-Point Data Types ArchitectureAddressing Integer Data Types21264/EV68A Microprocessor Features 21264/EV68A Microprocessor Features21264/EV68A Microprocessor Features Internal Architecture Internal Architecture21264/EV68A Microarchitecture Virtual Program Counter Logic Instruction Fetch, Issue, and Retire Unit21264/EV68A Microarchitecture Branch Predictor 21264/EV68A Block DiagramGlobal Predictor Local PredictorInstruction-Stream Translation Buffer Choice PredictorRegister Rename Maps Integer Issue QueueInstruction Fetch Logic Hwret Floating-Point Issue QueueRetire Logic Integer Execution UnitException and Interrupt Logic Integer Execution Unit-Clusters 0 PERR, MINxxx, MAXxxx, UNPKxx, PKxx10Internal Architecture Floating-Point Execution Unit21264/EV68A contains two onchip primary-level caches External Cache and System Interface UnitOnchip Caches 12Internal Architecture Memory Reference UnitData Cache Miss address file MAF Dstream translation buffer DTB Pipeline OrganizationPipeline Organization Srom Interface14Internal Architecture Stage 0 Instruction FetchStage 1 Instruction Slot Stage 2 Map Stage 3 IssueEbox and Fbox pipelines begin execution Instruction Issue RulesInstruction Issue Rules Pipeline AbortsInstruction Name, Pipeline, and Types Instruction Group DefinitionsInstruction Group Definitions and Pipeline Unit Ebox SlottingFTOIS, Ftoit ITOFS, ITOFF, ItoftU U L E L U E E L L E U 20Internal Architecture Instruction LatenciesInstruction Class Latency in Cycles HwmfprMinimum Retire Latencies for Instruction Classes Instruction Retire RulesInstruction Retire Rules BSR/JSR Retire of Operate Instructions into R31/F31Retire of Operate Instructions into R31/F31 Floating-Point Divide/Square Root Early RetireInstructions Retired Without Execution Load Instructions to R31 and F31Load Instructions to R31 and F31 Prefetch with Modify Intent LDS InstructionLoad Hit Speculation Special Cases of Alpha Instruction ExecutionSpecial Cases of Alpha Instruction Execution Prefetch, Evict Next LDQ and Hwldq Instructions10 Pipeline Timing for Floating-Point Load Instructions 26Internal Architecture Floating-Point Store InstructionsCmov Instruction 2 I/O Address Space Load Instructions Memory and I/O Address Space InstructionsMemory and I/O Address Space Instructions Memory Address Space Load Instructions28Internal Architecture Memory Address Space Store InstructionsRules for I/O Address Space Load Instruction Data Merging Rules for I/O Address Space Store Instruction Data Merging 4 I/O Address Space Store InstructionsMAF Memory Address Space Merging Rules MAF Memory Address Space Merging RulesInstruction Ordering Mbox Order Traps Replay TrapsReplay Traps Memory Barrier MB/WMB/TB Fill Flow 12 I/O Write Buffer and the WMB InstructionWrite Buffer and the WMB Instruction Other Mbox Replay TrapsWMB Instruction Processing MB Instruction Processing34Internal Architecture TB Fill Flow12 TB Fill Flow Example Sequence 13 TB Fill Flow Example SequenceFloating-point control register Fpcr is shown in Figure Performance Measurement Support-Performance CountersFloating-Point Control Register Performance Measurement Support-Performance Counters36Internal Architecture Floating-Point Control Register14 Floating-Point Control Register Fields Amask and Implver Instruction Values Amask and Implver Instruction ValuesImplver Design ExamplesDesign Examples Amask12 Typical Uniprocessor Configuration Page Hardware Interface 21264/EV68A Microprocessor Logic SymbolHardware Interface 21264/EV68A Microprocessor Logic Symbol 21264/EV68A Microprocessor Logic Symbol21264/EV68A Signal Descriptions 21264/EV68A Signal Names and Functions21264/EV68A Signal Names and Functions Signal Pin Types DefinitionsDcokh Pllvdd TestStatH 21264/EV68A Signal Descriptions by FunctionSysVref Domain SysAddInL140 Pin Assignments Pin List Sorted by Signal NamePin Assignments AC1 Pllvdd 10Hardware InterfaceAA5 12Hardware Interface Pin List Sorted by PGA LocationSysDataL28 14Hardware Interface BcDataH70 SysDataL5 16Hardware Interface Ground and Power VSS and VDD Pin ListMechanical Specifications Mechanical Specifications18Hardware Interface 21264/EV68A Packaging21264/EV68A Packaging 21264/EV68A Bottom View Pin Up Page Cache and External Interfaces Cache and External InterfacesIntroduction to the External Interfaces Introduction to the External Interfaces 21264/EV68A System and Bcache Interfaces System InterfaceSecond-Level Cache Bcache Interface Commands and AddressesPhysical Address Considerations Physical Address ConsiderationsMB/WMB ECB I/OPhysical Address Considerations System Duplicate Tag Stores Bcache Interface SignalsBcache Structure Bcache StructureCache Coherency Basics Victim Data BufferCache Coherency Victim Data Buffer21264/EV68A-Supported Cache Block States Cache CoherencyCache Block States 2lists the cache block states supported by the 21264/EV68ACache Block State Transitions Mands. -4lists these commandsSystem Responses to 21264/EV68A Commands Cache Block State TransitionsSystem Responses to 21264/EV68A Commands and Reactions Using SysDc Commands12Cache and External Interfaces Dcache States and Duplicate Tags 14Cache and External Interfaces Lock MechanismLock Mechanism Liveness and Fairness In-Order Processing of LDxL/STxC InstructionsInternal Eviction of LDxL Blocks 16Cache and External Interfaces System PortSystem Port System Port Pins System Port Pins18Cache and External Interfaces Programming the System Interface ClocksProgramming Values for System Interface Clocks Program Values for Data-Sample/Drive CSRsForwarded Clocks and Frame Clock Ratio 3 21264/EV68A-to-System CommandsBank Interleave on Cache Block Boundary Mode 12describes the field definitions for Tables 4-10and Hit Mode11 Page Hit Mode of Operation 12 21264/EV68A-to-System Command Fields Definitions13 Maximum Physical Address for Short Bus Format 4 21264/EV68A-to-System Commands Descriptions14describes the 21264/EV68A-to-system commands 14 21264/EV68A-to-System Commands Descriptions22Cache and External Interfaces 15 Programming INVALTODIRTYENABLE10 24Cache and External Interfaces ProbeResponse Commands Command40 =16 Programming SETDIRTYENABLE20 17 21264/EV68A ProbeResponse Command18 ProbeResponse Fields Descriptions SysAck and 21264/EV68A-to-System Commands Flow Control18describes the ProbeResponse command fields RVB RPB System-to-21264/EV68A CommandsProbe Commands Four Cycles 19 System-to-21264/EV68A Probe Commands21 Data Movement Selection by Probe43 20 System-to-21264/EV68A Probe Commands Fields Descriptions21 lists the data movement selected by Probe43 22lists the next cache block state selected by Probe2028Cache and External Interfaces Data Transfer Commands Two Cycles23 Data Transfer Command Format 24 SysDc40 Field Description 24describes the SysDc40 field30Cache and External Interfaces Data Movement In and Out of the 21264/EV68A8.1 21264/EV68A Clock Basics Fast Data Mode 32Cache and External Interfaces 25 Sysclk Cycles Between SysAddOut and SysDataFast Data Disable Mode 26shows four example configurations and shows their use26 Cbox CSR SYSDCDELAY40 Examples 34Cache and External Interfaces 27 Four Timing ExamplesSysDataInValidL and SysDataOutValidL SysDataInValidLSysFillValidL SysDataOutValidL36Cache and External Interfaces Data Wrapping28 Data Wrapping Rules 30 Wrap Interleave Order 30defines the interleaved scheme for the wrap order29 System Wrap and Deliver Data 38Cache and External Interfaces Nonexistent Memory Processing31defines the wrap order for double-pumped data trans fers 31 Wrap Order for Double-Pumped Data Transfers21264/EV68A Command NXM Address System/21264/EV68A Response 40Cache and External Interfaces 10.1 21264/EV68A Commands and System ProbesOrdering of System Port Transactions System Port Bcache Port Bcache Port35 Range of Maximum Bcache Clock Ratios Bcache Port Pins36 Bcache Port Pins 44Cache and External Interfaces Bcache ClockingSetting the Period of the Cache Clock 37 BCCPUCLKDELAY10 Values38 BCCLKDELAY10 Values 46Cache and External Interfaces 39 Program Values to Set the Cache Clock Period Single-DataBcache Data Read and Tag Read Transactions Bcache Transactions41 Data-Sample/Drive Cbox CSRs 48Cache and External Interfaces Bcache Data Write TransactionsDual-data mode, bcfrm is twice the ratio When the ratio is even, bcfrm is equal to the ratioWhen the ratio is odd, bcfrm is twice the ratio For example, in single-data mode50Cache and External Interfaces Pin DescriptionsRelationship Between Write-to-Read Bcwrrdbubbles and wrrd Relationship Between Read-to-Write Bcrdwrbubbles and rdwrBcAddH234 Bcache Control Pins43 Programming the Bcache Control Pins 44 lists the combination of control pin assertion for52Cache and External Interfaces 45 Control Pin Assertion for Ramtype B46 Control Pin Assertion for Ramtype C 47 Control Pin Assertion for Ramtype DBcDataInClkH and BcTagInClkH Bcache BankingDisabling the Bcache for Debugging 54Cache and External Interfaces InterruptsInterrupts Internal Processor Registers Internal Processor RegistersMbox IPRs Cycle Counter Control Register Ccctl Ebox IPRsEbox IPRs Cycle Counter Register CCCycle Counter Control Register Fields Description Virtual Address Register VAVirtual Address Control Register Vactl 2describes the Ccctl register fieldsVAFORM32 Virtual Address Format Register Vaform3describes the virtual address control register fields Virtual Address Control Register Fields DescriptionITB PTE Array Write Register Itbpte Ibox IPRsIbox IPRs ITB Tag Array Write Register ItbtagITB Invalidate Single Register Itbis ITB Invalidate All Process ASM=0 Register ItbiapITB Invalidate All Register Itbia ProfileMe PC Fields Description ProfileMe PC Register PmpcException Address Register Excaddr 4describes the ProfileMe PC register fieldsInstruction Virtual Address Format Register Ivaform Interrupt Enable and Current Processor Mode Register Iercm10Internal Processor Registers Software Interrupt Request Register SirrIercm Register Fields Description Software Interrupt Request Register Fields Description Interrupt Summary Register Isum6describes the software interrupt request register fields 12Internal Processor Registers Hardware Interrupt Clear Register Hwintclr7describes the interrupt summary register fields Interrupt Summary Register Fields DescriptionMchkd W1C Exception Summary Register Excsum8describes the hardware interrupt clear register fields Hardware Interrupt Clear Register Fields Description14Internal Processor Registers 9describes the exception summary register fieldsException Summary Register Fields Description 10 PAL Base Register Fields Description PAL Base Register PalbaseIbox Control Register Ictl 10describes the PAL base register fields16Internal Processor Registers 11describes the Ibox control register fields11 Ibox Control Register Fields Description PCT0EN SingleissuehSTWAIT64K PCT1EN18Internal Processor Registers Ibox Status Register IstatSpce TRP 12describes the Ibox status register fields12 Ibox Status Register Fields Description MIS20Internal Processor Registers Clear Virtual-to-Physical Map Register Clrmap Sleep Mode Register SleepIcache Flush Register Icflush Icache Flush ASM Register Icflushasm22Internal Processor Registers 14describes the process context register fields14 Process Context Register Fields Description 15 Performance Counter Control Register Fields Description Performance Counter Control Register Pctrctl15describes the performance counter control register fields SL0 PctxppcePmstalled Pmkilledbm16 Performance Counter Control Register Input Select Fields Mbox IPRsMbox IPRs DTB Tag Array Write Registers 0 and 1 DTBTAG0, DTBTAG117describes the Dtbaltmode register fields DTB Alternate Processor Mode Register Dtbaltmode17 DTB Alternate Processor Mode Register Fields Description DTB PTE Array Write Registers 0 and 1 DTBPTE0, DTBPTE1ALTMODE10 Dstream TB Invalidate All Process ASM=0 Register DtbiapDstream TB Invalidate All Register Dtbia Dstream TB Invalidate Single Registers 0 and 1 DTBIS0,118 Memory Management Status Register Fields Description Dstream TB Address Space Number Registers 0 and 1 DTBASN0,1Memory Management Status Register Mmstat 18describes the memory management status register fieldsACV Mbox Control Register MctlFor 19 Mbox Control Register Fields Description Erences to superpages result in access violationsDcache Control Register Dcctl 19describes the Mbox control register fields20 Dcache Control Register Fields Description Dcache Status Register Dcstat20describes the Dcache control register fields 21 Dcache Status Register Fields Description Cbox CSRs and IPRsCbox CSRs and IPRs 21describes the Dcache status register fields22 describes the Cbox data register fields Cbox Data Register CdataCbox Shift Register Cshft Cbox Writeonce Chain Description34Internal Processor Registers 24 Cbox Writeonce Chain OrderMboxbcprbstall BCLATDATAPATTERN031 BCLATTAGPATTERN023 BCWRRDBUBBLES0336Internal Processor Registers SYSCLKDELAY10 38Internal Processor Registers Cbox Writemany Chain Description25 Cbox Writemany Chain Order 40Internal Processor Registers 26 Cbox Read IPR Fields Description Cbox Read Register IPR Description0 1 1 Istreammemerr 0 1 1 DstreammemerrPrivileged Architecture Library Code Privileged Architecture Library CodePALcode Description PALmode Environment PALmode EnvironmentHwld Instruction Required PALcode Function CodesOpcodes Reserved for PALcode Required PALcode Function CodesHwld Instruction Fields Descriptions Opcodes Reserved for PALcodeHwst Instruction 3describes the Hwld instruction fieldsHwst Instruction Fields Descriptions Hwret Instruction4describes the Hwst instruction fields Hint Hwmfpr and Hwmtpr Instructions5describes the Hwret instruction fields Hwret Instruction Fields DescriptionsHwmfpr and Hwmtpr Instructions Fields Descriptions Internal Processor Register Access MechanismsInternal Processor Register Access Mechanisms 6describes the Hwmfpr and Hwmtpr instructions fieldsHardware Structure of Explicitly Written IPRs IPR Scoreboard BitsPaired Instruction Fetch Order IPR Access OrderingHardware Structure of Implicitly Written IPRs 10Privileged Architecture Library Code PALshadow Registers PALshadow RegistersPALcode Emulation of the Fpcr PALcode Entry Points PALcode Entry PointsPALcode Exception Entry Locations PALcode Exception Entry Points14Privileged Architecture Library Code Translation Buffer TB Fill FlowsTranslation Buffer TB Fill Flows DTB FillWr PTE LD-PTE, write TB Wr DataTb miss 16Privileged Architecture Library Code ITB FillPerformance Counter Support Performance Counter SupportIPRs Used for Performance Counter Support General PrecautionsAggregate Mode Programming Guidelines Aggregate Mode PrecautionsSL1 10 Aggregate Mode Returned IPR ContentsOperation Pctrctl SL0This input counts Mbox replay traps ProfileMe Mode Programming Guidelines11shows the counter modes that are used with Aggregate mode 12 Cmov Decomposed 22Privileged Architecture Library Code 13 ProfileMe Mode Returned IPR ContentsInum retire delay cycles ProfileMe Counting Mode Description Cycle counting24Privileged Architecture Library Code 14shows the counter modes that are used with ProfileMe modeCounter Modes for ProfileMe Mode 14 ProfileMe Mode Pctrctl Input Select FieldsInitialization and Configuration Initialization and ConfigurationPower-Up Reset Flow and the ResetL and Dcokh Pins 21264/EV68A Reset State Machine Major OperationsConstraints Power-Up Reset Flow and the ResetL and Dcokh PinsSignal Pin Reset State Power Sequencing and Reset State for Signal PinsPllvdd Clock Forwarding and System Clock Ratio ConfigurationPLL Pin Signal Names and Initialization StateBiST and Srom Load and the TestStatH Pin PLL Ramp UpEV68A Clock Forward Reset and System Interface InitializationPower-Up Flow Signals and Their Constraints Effect on IPRs After Fault Reset Fault Reset FlowFault Reset Flow Energy Star Certification and Sleep Mode Flow Energy Star Certification and Sleep Mode Flow10Initialization and Configuration Effect on IPRs After Transition Through Sleep ModeEffect on IPRs After Warm Reset Warm Reset FlowWarm Reset Flow Signals and Constraints for the Sleep Mode SequenceArray Initialization Initialization Mode Processing12Initialization and Configuration Array InitializationEvictenable BCWRTSTS30 Bcbankenable Initialization Mode ProcessingExternal Interface Initialization Internal Processor Register Power-Up Reset State10 Internal Processor Registers at Power-Up Reset State 14Initialization and ConfigurationInternal Processor Register Power-Up Reset State 16Initialization and Configuration Ieee 1149.1 Test Port ResetReset State Machine Ieee 1149.1 Test Port Reset11 21264/EV68A Reset State Machine State Descriptions Reset State Machine18Initialization and Configuration PLL Output Clocks Phase-Lock Loop PLL Functional DescriptionPhase-Lock Loop PLL Functional Description Differential Reference Clocks20Initialization and Configuration Power-Up/Reset ClockingError Detection and Error Handling Error Detection and Error Handling21264/EV68A Error Detection Mechanisms Data Error Correction Code Data Error Correction CodeIcache Data or Tag Parity Error Dcache Tag Parity ErrorLoad Instruction Dcache Data Single-Bit Correctable ECC ErrorDcache Data Single-Bit Correctable ECC Error Store Instruction Quadword or Smaller Dcache Store Second ErrorDcache Duplicate Tag Parity Error Dcache Store Second ErrorControlling Bcache Block Parity Calculation Bcache Tag Parity ErrorBcache Data Single-Bit Correctable ECC Error Bcache Tag Parity ErrorDcache Fill from Bcache Bcache Data Single-Bit Correctable ECC ErrorIcache Fill from Memory Memory/System Port Single-Bit Data Correctable ECC ErrorMemory/System Port Single-Bit Data Correctable ECC Error Bcache Victim ReadDcache Fill from Memory Bcache Data Single-Bit Correctable ECC Error on a Probe Bcache Data Single-Bit Correctable ECC Error on a ProbeDouble-Bit Fill Errors Section D.36 Error Case SummaryError Case Summary 3summarizes the various error cases and their ramificationsMchk Cstatistreambcdbl Mchk CstatistreammemerrCstatdstreammemerr CRD CstatprobebcerrPage Maximum Electrical Ratings Electrical CharacteristicsElectrical Data 1lists the maximum electrical ratings for the 21264/EV68AIdcpower DC CharacteristicsDC Characteristics Signal TypesInput Differential Amplifier Clock Receiver Idaclk VDD IdcpowerInput DC Reference Pin Idcref Input Differential Amplifier Receiver IDACodtp Pin Type Open-Drain Driver for Test Pins OodtpPin Type Open-Drain Output Driver OOD IOZ12 Push-Pull Output Clock Driver Oppclk 11 Push-Pull Output Driver OPPAC Test Conditions AC CharacteristicsAC Characteristics TSU1 TDH2 13 AC SpecificationsDcokh AC Characteristics Page That causes thermal failure Operating TemperatureOperating Temperature at Heat Sink Center Tc Thermal Management10-2Thermal Management Operating TemperatureΘca at Various Airflows for 21264/EV68A Heat Sink Specifications Heat Sink Specifications10-4Thermal Management Type 2 Heat SinkType 3 Heat Sink 10-6Thermal Management Thermal Design ConsiderationsThermal Design Considerations Testability and Diagnostics Testability and DiagnosticsTest Pins Dedicated Test Port PinsSrom Load Operation SROM/Serial Diagnostic Terminal PortSROM/Serial Diagnostic Terminal Port 11-2Testability and DiagnosticsIeee 1149.1 Instructions and Opcodes Ieee 1149.1 PortIeee 1149.1 Port TAP Controller State Machine 11-4Testability and DiagnosticsTestStatH Pin TestStatH PinSrom Initialization Power-Up Self-Test and InitializationPower-Up Self-Test and Initialization Built-in Self-TestSerial Instruction Cache Load Operation 11-6Testability and DiagnosticsReferences See Appendix B for a listing of the Boundary-Scan RegisterIcache Bit Fields in an Srom Line Page Alpha Instruction Set A-1 Alpha Instruction SetAlpha Instruction Summary Table A-1 Instruction Format and Opcode NotationAlpha Instruction Summary Opr 11.46 Cmove if ≥ zero Mbr Branch to subroutinePcd Trap to PALcode Opr 11.24 Cmove if = zero15.0BE Convert quadword to Gfloating 15.0AF Convert Gfloating to quadword17.010 Convert longword to quadword 15.0BC Convert quadword to Ffloating17.02B Fcmove if ≠ zero 17.02F Fcmove if zero17.02E Fcmove if ≤ zero 17.02C Fcmove if zeroMem Load Sfloating Opr 13.40 Multiply longword with integer overflow enableOpr 13.60 Multiply quadword with integer overflow enable Opr 1C.31 Pixel errorOpr 10.02 Scaled add longword by Opr 1C.36 Pack words to bytes Mfc 18.E000 Read and clearMbr 1A.2 Return from subroutine Mfc 18.C000 Read process cycle counter 18.F000 Read and setOpcodes Reserved for Compaq Reserved OpcodesReserved Opcodes Opcodes Reserved for PALcode Ieee Floating-Point InstructionsIeee Floating-Point Instructions 12B 16B 08B 00B 04B18B 10B 14B 02B 06BVAX Floating-Point Instructions VAX Floating-Point InstructionsIndependent Floating-Point Instructions Opcode Summary Opcode SummaryFloating-point operate instruction opcodes Mem Table A-9explains the symbols used in Table A-8Mem Res Ieee floating-point instruction opcodes14Alpha Instruction Set Ieee Floating-Point ConformanceIeee Floating-Point Conformance Alpha Instruction Set A-15 Table A-11 Exceptional Input and Output Conditions16Alpha Instruction Set Alpha Instruction Set A-17 Cmpteq Cmptun InputCmptlt Cmptle Input Fbeq Fbne Fblt Fble Fbgt Fbge LDS LDT STS STT Cpys Cpysn Boundary-Scan Register 21264/EV68A Boundary-Scan RegisterPllvdd Boundary-Scan Register21264/EV68A Boundary-Scan Register B-3 421264/EV68A Boundary-Scan Register 21264/EV68A Boundary-Scan Register B-5 621264/EV68A Boundary-Scan Register 21264/EV68A Boundary-Scan Register B-7 821264/EV68A Boundary-Scan Register 21264/EV68A Boundary-Scan Register B-9 1021264/EV68A Boundary-Scan Register 21264/EV68A Boundary-Scan Register B-11 1221264/EV68A Boundary-Scan Register Serial Icache Load Predecode Values C-1 Serial Icache Load Predecode ValuesPage PALcode Restrictions and Guidelines D-1 PALcode Restrictions and Guidelines2PALcode Restrictions and Guidelines PALcode Restrictions and Guidelines D-3 4PALcode Restrictions and Guidelines Initwritemany PALcode Restrictions and Guidelines D-56PALcode Restrictions and Guidelines PALcode Restrictions and Guidelines D-7 8PALcode Restrictions and Guidelines PALcode Restrictions and Guidelines D-9 Restriction 7 Replay Trap, Interrupt Code Sequence, and STF10PALcode Restrictions and Guidelines Restriction 10 Duplicate IPR Mode BitsRestriction 9 PALmode Istream Address Ranges Restriction 9 PALmode Istream Address RangesRestriction 14 Hwret Restriction 11 Ibox IPR Update SynchronizationRestriction 11 Ibox IPR Update Synchronization Restriction 13 DTB Fill Flow CollisionGuideline 16 JSR-BAD VA Guideline 20 Ictlsbe Stream Buffer EnableGuideline 16 JSR-BAD VA Restriction 21 HWRET/STALL After Hwmtpr ASN0/ASN1PALcode Restrictions and Guidelines D-13 Restriction 22 HWRET/STALL After Hwmtpr IS0/IS1Restriction 22 HWRET/STALL After Hwmtpr IS0/IS1 14PALcode Restrictions and Guidelines Restriction 25 Hwmtpr Itbia After ResetGuideline 26 Conditional Branches in PALcode Restriction 24 HWRET/STALL After Hwmtpr ICFLUSH, IcflushasmPALcode Restrictions and Guidelines D-15 Guideline 29 JSR, JMP, RET, and Jsrcor in PALcodeRestriction 30 Hwmtpr and Hwmfpr to the Cbox CSR 16PALcode Restrictions and Guidelines Restriction 30 Hwmtpr and Hwmfpr to the Cbox CSRPALcode Restrictions and Guidelines D-17 Restriction 31 ICTLVA48 UpdateRestriction 32 Pctrctl Update Restriction 31 ICTLVA48 UpdateRestriction 37 Updating VACTLVA48 Guideline 35 Hwintclr UpdateRestriction 33 Hwld Physical/Lock Use Restriction 36 Updating IctlsdePALcode Restrictions and Guidelines D-19 Restriction 40 Scrubbing a Single-Bit Error20PALcode Restrictions and Guidelines Restriction 40 Scrubbing a Single-Bit ErrorPALcode Restrictions and Guidelines D-21 Restriction 42 Updating VACTL, CCCTL, or CC IPRsRestriction 43 No Trappable Instructions Along with 22PALcode Restrictions and Guidelines Restriction 47 Cache Eviction for Single-Bit Cache ErrorsPALcode Restrictions and Guidelines D-23 Restriction 47 Cache Eviction for Single-Bit Cache Errors24PALcode Restrictions and Guidelines Table E-1 Bcache Forwarding Clock Pin Groupings 21264/EV68A-to-Bcache Pin InterfaceForwarding Clock Pin Groupings Tag Pin Usage Late-Write Non-Bursting SSRAMsLate-Write Non-Bursting SSRAMs Data Pin UsageTable E-4 Dual-Data Rate Ssram Data Pin Usage Dual-Data Rate SSRAMsDual-Data Rate SSRAMs 421264/EV68A-to-Bcache Pin Interface TrstlTable E-5 Dual-Data Rate Ssram Tag Pin Usage 21264/EV68A-to-Bcache Pin Interface E-5 Page Glossary BIU BSR Cisc CSR CmosCPI CPUDTL DMADram DTBFpga FepromFET FEUIDU GclkJfet IowbIpga ITBMips MAFMBO MBZNvram MSINaturally Aligned NmosPlcc PALPGA PLARAS PqfpProm RAMSAM RiscROM RTLSipp SdramSimm SIPUnaligned StramTTL UartVDF UnpredictableUvprom VAFWriteblock WARNumerics IndexIndex-2 Index-3 Index-4 ECC Index-6 Index-7 Index-8 Index-9 Index-10 Index-11 Index-12