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Compaq EV68A specifications 12Cache and External Interfaces

Models: EV68A

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Cache Coherency

Table 4–5 System Responses to 21264/EV68A Commands and Reactions (Continued)

21264/EV68A
CMD	SysDc	21264/EV68A Action

RdBlkModx	ReadData	The cache block is filled and marked with a nonwritable status. If the
	ReadDataShared	store instruction that generated the RdBlkModx command is still
	ReadDataShared/Dirty	active (not killed), the 21264/EV68A will retry the instruction, gener-
		ating the appropriate ChangeToDirty command. Succeeding store
		commands cannot update the block without external reference.
RdBlkModx	ReadDataDirty	The 21264/EV68A performs a normal fill response, and the cache
		block becomes writable.
RdBlkModx	ChangeToDirtySuccess	Both SysDc responses are illegal for read/modify commands.
	ChangeToDirtyFail
RdBlkModx	ReadDataError	The cache block command was to NXM address space. The 21264/
		EV68A delivers an all-ones pattern to any dependent load command,
		forces a fail action on any pending store commands to this block, and
		any store to this block is not retried. The Cbox evicts the cache block
		from the cache system (with associated victim processing). The cache
		block is marked invalid.
ChxToDirty	ReadData	The original data in the Dcache is replaced with the filled data. The
	ReadDataShared	block is not writable, so the 21264/EV68A will retry the store instruc-
	ReadDataShared/Dirty	tion and generate another ChxToDirty class command. To avoid a
		potential livelock situation, the STC_ENABLE CSR bit must be set.
		Any STx_C instruction to this block is forced to fail. In addition, a
		Shared/Dirty response causes the 21264/EV68A to generate a victim
		for this block upon eviction.
ChxToDirty	ReadDataDirty	The data in the Dcache is replaced with the filled data. The block is
		writable, so the store instruction that generated the original command
		can update this block. Any STx_C instruction to this block is forced
		to fail. In addition, the 21264/EV68A generates a victim for this
		block upon eviction.
ChxToDirty	ReadDataError	Impossible situation. The block must be cached to generate a ChxTo-
		Dirty command. Caching the block is not possible because all NXM
		fills are filled noncached.
ChToDirty	ChangeToDirtySuccess	Normal response. ChangeToDirtySuccess makes the block writable.
		The 21264/EV68A retries the store instruction and updates the
		Dcache. Any STx_C instruction associated with this block is allowed
		to succeed.
ChxToDirty	ChangeToDirtyFail	The MAF entry is retired. Any STx_C instruction associated with the
		block is forced to fail. If a STx instruction generated this block, the
		21264/EV68A retries and generates either a RdBlkModx (because the
		reference that failed the ChangeToDirty also invalidated the cache by
		way of an invalidating probe) or another ChxToDirty command.
InvalToDirty	ReadData	The block is not writable, so the 21264/EV68A will retry the WH64
	ReadDataShared	instruction and generate a ChxToDirty command.
	ReadDataShared/Dirty
InvalToDirty	ReadDataError	The 21264/EV68A doesn’t send InvalToDirty commands offchip
		speculatively. This NXM condition is a hard error. Systems should
		perform a machine check.
InvalToDirty	ReadDataDirty	The block is writable. Done.
	ChangeToDirtySuccess

4–12Cache and External Interfaces

21264/EV68A Hardware Reference Manual

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Compaq EV68A specifications 12Cache and External Interfaces

Contents

Revision/Update Information Compaq Computer Corporation Shrewsbury, Massachusetts21264/EV68A Hardware Reference Manual Table of Contents Hardware Interface Cache and External InterfacesInternal Processor Registers Privileged Architecture Library Code Initialization and Configuration Mffpcr MtfpcrError Detection and Error Handling Testability and DiagnosticsElectrical Data Thermal ManagementAlpha Instruction Set 21264/EV68A Boundary-Scan Register21264/EV68A-to-Bcache Pin Interface Glossary IndexFigures 10-2 Type 2 Heat Sink Tables Xiv VDD Idcpower Page Preface ContentAudience Documentation Included by Reference For example Terminology and ConventionsAbbreviations W1C W1SAddresses Aligned and UnalignedSignal Names Data UnitsDo Not Care ExternalUndefined Do not care. a capital X represents any valid value Page Architecture IntroductionIntroduction Architecture AddressingInteger Data Types Floating-Point Data Types21264/EV68A Microprocessor Features 21264/EV68A Microprocessor Features21264/EV68A Microprocessor Features 21264/EV68A Microarchitecture Internal ArchitectureInternal Architecture 21264/EV68A Microarchitecture Instruction Fetch, Issue, and Retire UnitVirtual Program Counter Logic 21264/EV68A Block Diagram Branch PredictorLocal Predictor Global PredictorChoice Predictor Instruction-Stream Translation BufferInstruction Fetch Logic Integer Issue QueueRegister Rename Maps Floating-Point Issue Queue HwretException and Interrupt Logic Integer Execution UnitRetire Logic PERR, MINxxx, MAXxxx, UNPKxx, PKxx Integer Execution Unit-Clusters 0Floating-Point Execution Unit 10Internal ArchitectureOnchip Caches External Cache and System Interface Unit21264/EV68A contains two onchip primary-level caches Data Cache Memory Reference Unit12Internal Architecture Pipeline Organization Pipeline OrganizationSrom Interface Miss address file MAF Dstream translation buffer DTBStage 1 Instruction Slot Stage 0 Instruction Fetch14Internal Architecture Stage 3 Issue Stage 2 MapInstruction Issue Rules Instruction Issue RulesPipeline Aborts Ebox and Fbox pipelines begin executionInstruction Group Definitions Instruction Name, Pipeline, and TypesEbox Slotting FTOIS, FtoitITOFS, ITOFF, Itoft Instruction Group Definitions and Pipeline UnitU U L E L U E E L L E U Instruction Latencies Instruction Class Latency in CyclesHwmfpr 20Internal ArchitectureInstruction Retire Rules Instruction Retire RulesMinimum Retire Latencies for Instruction Classes Retire of Operate Instructions into R31/F31 Retire of Operate Instructions into R31/F31Floating-Point Divide/Square Root Early Retire BSR/JSRLoad Instructions to R31 and F31 Load Instructions to R31 and F31Prefetch with Modify Intent LDS Instruction Instructions Retired Without ExecutionSpecial Cases of Alpha Instruction Execution Special Cases of Alpha Instruction ExecutionPrefetch, Evict Next LDQ and Hwldq Instructions Load Hit Speculation10 Pipeline Timing for Floating-Point Load Instructions Cmov Instruction Floating-Point Store Instructions26Internal Architecture Memory and I/O Address Space Instructions Memory and I/O Address Space InstructionsMemory Address Space Load Instructions 2 I/O Address Space Load InstructionsRules for I/O Address Space Load Instruction Data Merging Memory Address Space Store Instructions28Internal Architecture 4 I/O Address Space Store Instructions Rules for I/O Address Space Store Instruction Data MergingInstruction Ordering MAF Memory Address Space Merging RulesMAF Memory Address Space Merging Rules Replay Traps Replay TrapsMbox Order Traps 12 I/O Write Buffer and the WMB Instruction Write Buffer and the WMB InstructionOther Mbox Replay Traps Memory Barrier MB/WMB/TB Fill FlowMB Instruction Processing WMB Instruction ProcessingTB Fill Flow 12 TB Fill Flow Example Sequence13 TB Fill Flow Example Sequence 34Internal ArchitecturePerformance Measurement Support-Performance Counters Floating-Point Control RegisterPerformance Measurement Support-Performance Counters Floating-point control register Fpcr is shown in Figure14 Floating-Point Control Register Fields Floating-Point Control Register36Internal Architecture Amask and Implver Instruction Values Amask and Implver Instruction ValuesDesign Examples Design ExamplesAmask Implver12 Typical Uniprocessor Configuration Page Hardware Interface 21264/EV68A Microprocessor Logic SymbolHardware Interface 21264/EV68A Microprocessor Logic Symbol 21264/EV68A Microprocessor Logic Symbol21264/EV68A Signal Names and Functions 21264/EV68A Signal Names and FunctionsSignal Pin Types Definitions 21264/EV68A Signal DescriptionsDcokh Pllvdd 21264/EV68A Signal Descriptions by Function TestStatHSysVref Domain SysAddInL140 Pin Assignments Pin List Sorted by Signal NamePin Assignments AC1 10Hardware Interface PllvddAA5 Pin List Sorted by PGA Location 12Hardware InterfaceSysDataL28 14Hardware Interface BcDataH70 SysDataL5 Ground and Power VSS and VDD Pin List 16Hardware InterfaceMechanical Specifications Mechanical Specifications21264/EV68A Packaging 21264/EV68A Packaging18Hardware Interface 21264/EV68A Bottom View Pin Up Page Introduction to the External Interfaces Cache and External InterfacesCache and External Interfaces Introduction to the External Interfaces System Interface 21264/EV68A System and Bcache InterfacesCommands and Addresses Physical Address ConsiderationsPhysical Address Considerations Second-Level Cache Bcache InterfaceECB I/O MB/WMBPhysical Address Considerations Bcache Interface Signals Bcache StructureBcache Structure System Duplicate Tag StoresVictim Data Buffer Cache CoherencyVictim Data Buffer Cache Coherency BasicsCache Coherency Cache Block States2lists the cache block states supported by the 21264/EV68A 21264/EV68A-Supported Cache Block StatesMands. -4lists these commands System Responses to 21264/EV68A CommandsCache Block State Transitions Cache Block State TransitionsUsing SysDc Commands System Responses to 21264/EV68A Commands and Reactions12Cache and External Interfaces Dcache States and Duplicate Tags Lock Mechanism Lock Mechanism14Cache and External Interfaces Internal Eviction of LDxL Blocks In-Order Processing of LDxL/STxC InstructionsLiveness and Fairness System Port System Port16Cache and External Interfaces System Port Pins System Port PinsProgramming the System Interface Clocks Programming Values for System Interface ClocksProgram Values for Data-Sample/Drive CSRs 18Cache and External InterfacesBank Interleave on Cache Block Boundary Mode 3 21264/EV68A-to-System CommandsForwarded Clocks and Frame Clock Ratio Hit Mode 11 Page Hit Mode of Operation12 21264/EV68A-to-System Command Fields Definitions 12describes the field definitions for Tables 4-10and4 21264/EV68A-to-System Commands Descriptions 14describes the 21264/EV68A-to-system commands14 21264/EV68A-to-System Commands Descriptions 13 Maximum Physical Address for Short Bus Format22Cache and External Interfaces 15 Programming INVALTODIRTYENABLE10 ProbeResponse Commands Command40 = 16 Programming SETDIRTYENABLE2017 21264/EV68A ProbeResponse Command 24Cache and External Interfaces18describes the ProbeResponse command fields SysAck and 21264/EV68A-to-System Commands Flow Control18 ProbeResponse Fields Descriptions System-to-21264/EV68A Commands Probe Commands Four Cycles19 System-to-21264/EV68A Probe Commands RVB RPB20 System-to-21264/EV68A Probe Commands Fields Descriptions 21 lists the data movement selected by Probe4322lists the next cache block state selected by Probe20 21 Data Movement Selection by Probe4323 Data Transfer Command Format Data Transfer Commands Two Cycles28Cache and External Interfaces 24describes the SysDc40 field 24 SysDc40 Field Description8.1 21264/EV68A Clock Basics Data Movement In and Out of the 21264/EV68A30Cache and External Interfaces Fast Data Mode 25 Sysclk Cycles Between SysAddOut and SysData 32Cache and External Interfaces26 Cbox CSR SYSDCDELAY40 Examples 26shows four example configurations and shows their useFast Data Disable Mode 27 Four Timing Examples SysDataInValidL and SysDataOutValidLSysDataInValidL 34Cache and External InterfacesSysDataOutValidL SysFillValidL28 Data Wrapping Rules Data Wrapping36Cache and External Interfaces 29 System Wrap and Deliver Data 30defines the interleaved scheme for the wrap order30 Wrap Interleave Order Nonexistent Memory Processing 31defines the wrap order for double-pumped data trans fers31 Wrap Order for Double-Pumped Data Transfers 38Cache and External Interfaces21264/EV68A Command NXM Address System/21264/EV68A Response Ordering of System Port Transactions 10.1 21264/EV68A Commands and System Probes40Cache and External Interfaces System Port Bcache Port Bcache Port36 Bcache Port Pins Bcache Port Pins35 Range of Maximum Bcache Clock Ratios Bcache Clocking 44Cache and External Interfaces38 BCCLKDELAY10 Values 37 BCCPUCLKDELAY10 ValuesSetting the Period of the Cache Clock 39 Program Values to Set the Cache Clock Period Single-Data 46Cache and External Interfaces41 Data-Sample/Drive Cbox CSRs Bcache TransactionsBcache Data Read and Tag Read Transactions Bcache Data Write Transactions 48Cache and External InterfacesWhen the ratio is even, bcfrm is equal to the ratio When the ratio is odd, bcfrm is twice the ratioFor example, in single-data mode Dual-data mode, bcfrm is twice the ratioPin Descriptions Relationship Between Write-to-Read Bcwrrdbubbles and wrrdRelationship Between Read-to-Write Bcrdwrbubbles and rdwr 50Cache and External InterfacesBcache Control Pins 43 Programming the Bcache Control Pins44 lists the combination of control pin assertion for BcAddH23445 Control Pin Assertion for Ramtype B 46 Control Pin Assertion for Ramtype C47 Control Pin Assertion for Ramtype D 52Cache and External InterfacesDisabling the Bcache for Debugging Bcache BankingBcDataInClkH and BcTagInClkH Interrupts Interrupts54Cache and External Interfaces Internal Processor Registers Internal Processor RegistersMbox IPRs Ebox IPRs Ebox IPRsCycle Counter Register CC Cycle Counter Control Register CcctlVirtual Address Register VA Virtual Address Control Register Vactl2describes the Ccctl register fields Cycle Counter Control Register Fields DescriptionVirtual Address Format Register Vaform 3describes the virtual address control register fieldsVirtual Address Control Register Fields Description VAFORM32Ibox IPRs Ibox IPRsITB Tag Array Write Register Itbtag ITB PTE Array Write Register ItbpteITB Invalidate All Register Itbia ITB Invalidate All Process ASM=0 Register ItbiapITB Invalidate Single Register Itbis ProfileMe PC Register Pmpc Exception Address Register Excaddr4describes the ProfileMe PC register fields ProfileMe PC Fields DescriptionInterrupt Enable and Current Processor Mode Register Iercm Instruction Virtual Address Format Register IvaformIercm Register Fields Description Software Interrupt Request Register Sirr10Internal Processor Registers 6describes the software interrupt request register fields Interrupt Summary Register IsumSoftware Interrupt Request Register Fields Description Hardware Interrupt Clear Register Hwintclr 7describes the interrupt summary register fieldsInterrupt Summary Register Fields Description 12Internal Processor RegistersException Summary Register Excsum 8describes the hardware interrupt clear register fieldsHardware Interrupt Clear Register Fields Description Mchkd W1CException Summary Register Fields Description 9describes the exception summary register fields14Internal Processor Registers PAL Base Register Palbase Ibox Control Register Ictl10describes the PAL base register fields 10 PAL Base Register Fields Description11 Ibox Control Register Fields Description 11describes the Ibox control register fields16Internal Processor Registers Singleissueh STWAIT64KPCT1EN PCT0ENSpce Ibox Status Register Istat18Internal Processor Registers 12describes the Ibox status register fields 12 Ibox Status Register Fields DescriptionMIS TRP20Internal Processor Registers Sleep Mode Register Sleep Icache Flush Register IcflushIcache Flush ASM Register Icflushasm Clear Virtual-to-Physical Map Register Clrmap14 Process Context Register Fields Description 14describes the process context register fields22Internal Processor Registers 15describes the performance counter control register fields Performance Counter Control Register Pctrctl15 Performance Counter Control Register Fields Description Pctxppce PmstalledPmkilledbm SL0Mbox IPRs Mbox IPRsDTB Tag Array Write Registers 0 and 1 DTBTAG0, DTBTAG1 16 Performance Counter Control Register Input Select FieldsDTB Alternate Processor Mode Register Dtbaltmode 17 DTB Alternate Processor Mode Register Fields DescriptionDTB PTE Array Write Registers 0 and 1 DTBPTE0, DTBPTE1 17describes the Dtbaltmode register fieldsDstream TB Invalidate All Process ASM=0 Register Dtbiap Dstream TB Invalidate All Register DtbiaDstream TB Invalidate Single Registers 0 and 1 DTBIS0,1 ALTMODE10Dstream TB Address Space Number Registers 0 and 1 DTBASN0,1 Memory Management Status Register Mmstat18describes the memory management status register fields 18 Memory Management Status Register Fields DescriptionFor Mbox Control Register MctlACV Erences to superpages result in access violations Dcache Control Register Dcctl19describes the Mbox control register fields 19 Mbox Control Register Fields Description20describes the Dcache control register fields Dcache Status Register Dcstat20 Dcache Control Register Fields Description Cbox CSRs and IPRs Cbox CSRs and IPRs21describes the Dcache status register fields 21 Dcache Status Register Fields DescriptionCbox Data Register Cdata Cbox Shift Register CshftCbox Writeonce Chain Description 22 describes the Cbox data register fields24 Cbox Writeonce Chain Order 34Internal Processor RegistersBCWRRDBUBBLES03 Mboxbcprbstall BCLATDATAPATTERN031 BCLATTAGPATTERN02336Internal Processor Registers SYSCLKDELAY10 Cbox Writemany Chain Description 38Internal Processor Registers25 Cbox Writemany Chain Order 40Internal Processor Registers Cbox Read Register IPR Description 26 Cbox Read IPR Fields Description0 1 1 Dstreammemerr 0 1 1 IstreammemerrPALcode Description Privileged Architecture Library CodePrivileged Architecture Library Code PALmode Environment PALmode EnvironmentRequired PALcode Function Codes Opcodes Reserved for PALcodeRequired PALcode Function Codes Hwld InstructionOpcodes Reserved for PALcode Hwst Instruction3describes the Hwld instruction fields Hwld Instruction Fields Descriptions4describes the Hwst instruction fields Hwret InstructionHwst Instruction Fields Descriptions Hwmfpr and Hwmtpr Instructions 5describes the Hwret instruction fieldsHwret Instruction Fields Descriptions HintInternal Processor Register Access Mechanisms Internal Processor Register Access Mechanisms6describes the Hwmfpr and Hwmtpr instructions fields Hwmfpr and Hwmtpr Instructions Fields DescriptionsIPR Scoreboard Bits Hardware Structure of Explicitly Written IPRsHardware Structure of Implicitly Written IPRs IPR Access OrderingPaired Instruction Fetch Order 10Privileged Architecture Library Code PALcode Emulation of the Fpcr PALshadow RegistersPALshadow Registers PALcode Entry Points PALcode Entry PointsPALcode Exception Entry Points PALcode Exception Entry LocationsTranslation Buffer TB Fill Flows Translation Buffer TB Fill FlowsDTB Fill 14Privileged Architecture Library CodeTb miss Wr DataWr PTE LD-PTE, write TB ITB Fill 16Privileged Architecture Library CodePerformance Counter Support Performance Counter SupportGeneral Precautions Aggregate Mode Programming GuidelinesAggregate Mode Precautions IPRs Used for Performance Counter Support10 Aggregate Mode Returned IPR Contents OperationPctrctl SL0 SL111shows the counter modes that are used with Aggregate mode ProfileMe Mode Programming GuidelinesThis input counts Mbox replay traps 12 Cmov Decomposed 13 ProfileMe Mode Returned IPR Contents 22Privileged Architecture Library CodeProfileMe Counting Mode Description Cycle counting Inum retire delay cycles14shows the counter modes that are used with ProfileMe mode Counter Modes for ProfileMe Mode14 ProfileMe Mode Pctrctl Input Select Fields 24Privileged Architecture Library CodeInitialization and Configuration Power-Up Reset Flow and the ResetL and Dcokh Pins21264/EV68A Reset State Machine Major Operations Initialization and ConfigurationPower-Up Reset Flow and the ResetL and Dcokh Pins ConstraintsPower Sequencing and Reset State for Signal Pins Signal Pin Reset StateClock Forwarding and System Clock Ratio Configuration PllvddPin Signal Names and Initialization State PLLPLL Ramp Up BiST and Srom Load and the TestStatH PinPower-Up Flow Signals and Their Constraints Clock Forward Reset and System Interface InitializationEV68A Fault Reset Flow Fault Reset FlowEffect on IPRs After Fault Reset Energy Star Certification and Sleep Mode Flow Energy Star Certification and Sleep Mode FlowEffect on IPRs After Transition Through Sleep Mode 10Initialization and ConfigurationWarm Reset Flow Warm Reset FlowSignals and Constraints for the Sleep Mode Sequence Effect on IPRs After Warm ResetInitialization Mode Processing 12Initialization and ConfigurationArray Initialization Array InitializationInitialization Mode Processing Evictenable BCWRTSTS30 BcbankenableInternal Processor Register Power-Up Reset State 10 Internal Processor Registers at Power-Up Reset State14Initialization and Configuration External Interface InitializationInternal Processor Register Power-Up Reset State Ieee 1149.1 Test Port Reset Reset State MachineIeee 1149.1 Test Port Reset 16Initialization and ConfigurationReset State Machine 11 21264/EV68A Reset State Machine State Descriptions18Initialization and Configuration Phase-Lock Loop PLL Functional Description Phase-Lock Loop PLL Functional DescriptionDifferential Reference Clocks PLL Output ClocksPower-Up/Reset Clocking 20Initialization and Configuration21264/EV68A Error Detection Mechanisms Error Detection and Error HandlingError Detection and Error Handling Data Error Correction Code Icache Data or Tag Parity ErrorDcache Tag Parity Error Data Error Correction CodeDcache Data Single-Bit Correctable ECC Error Dcache Data Single-Bit Correctable ECC ErrorLoad Instruction Dcache Store Second Error Dcache Duplicate Tag Parity ErrorDcache Store Second Error Store Instruction Quadword or SmallerBcache Tag Parity Error Bcache Data Single-Bit Correctable ECC ErrorBcache Tag Parity Error Controlling Bcache Block Parity CalculationBcache Data Single-Bit Correctable ECC Error Dcache Fill from BcacheMemory/System Port Single-Bit Data Correctable ECC Error Memory/System Port Single-Bit Data Correctable ECC ErrorBcache Victim Read Icache Fill from MemoryDcache Fill from Memory Double-Bit Fill Errors Bcache Data Single-Bit Correctable ECC Error on a ProbeBcache Data Single-Bit Correctable ECC Error on a Probe Error Case Summary Error Case Summary3summarizes the various error cases and their ramifications Section D.36Mchk Cstatistreammemerr CstatdstreammemerrCRD Cstatprobebcerr Mchk CstatistreambcdblPage Electrical Characteristics Electrical Data1lists the maximum electrical ratings for the 21264/EV68A Maximum Electrical RatingsDC Characteristics DC CharacteristicsSignal Types IdcpowerVDD Idcpower Input DC Reference Pin IdcrefInput Differential Amplifier Receiver IDA Input Differential Amplifier Clock Receiver IdaclkPin Type Open-Drain Driver for Test Pins Oodtp Pin Type Open-Drain Output Driver OODIOZ Codtp11 Push-Pull Output Driver OPP 12 Push-Pull Output Clock Driver OppclkAC Characteristics AC CharacteristicsAC Test Conditions 13 AC Specifications TSU1 TDH2Dcokh AC Characteristics Page Operating Temperature Operating Temperature at Heat Sink Center TcThermal Management That causes thermal failureΘca at Various Airflows for 21264/EV68A Operating Temperature10-2Thermal Management Heat Sink Specifications Heat Sink SpecificationsType 2 Heat Sink 10-4Thermal ManagementType 3 Heat Sink Thermal Design Considerations Thermal Design Considerations10-6Thermal Management Testability and Diagnostics Test PinsDedicated Test Port Pins Testability and DiagnosticsSROM/Serial Diagnostic Terminal Port SROM/Serial Diagnostic Terminal Port11-2Testability and Diagnostics Srom Load OperationIeee 1149.1 Port Ieee 1149.1 PortIeee 1149.1 Instructions and Opcodes 11-4Testability and Diagnostics TestStatH PinTestStatH Pin TAP Controller State MachinePower-Up Self-Test and Initialization Power-Up Self-Test and InitializationBuilt-in Self-Test Srom Initialization11-6Testability and Diagnostics Serial Instruction Cache Load OperationIcache Bit Fields in an Srom Line See Appendix B for a listing of the Boundary-Scan RegisterReferences Page Alpha Instruction Set Alpha Instruction SummaryTable A-1 Instruction Format and Opcode Notation Alpha Instruction Set A-1Alpha Instruction Summary Mbr Branch to subroutine Pcd Trap to PALcodeOpr 11.24 Cmove if = zero Opr 11.46 Cmove if ≥ zero15.0AF Convert Gfloating to quadword 17.010 Convert longword to quadword15.0BC Convert quadword to Ffloating 15.0BE Convert quadword to Gfloating17.02F Fcmove if zero 17.02E Fcmove if ≤ zero17.02C Fcmove if zero 17.02B Fcmove if ≠ zeroOpr 13.40 Multiply longword with integer overflow enable Opr 13.60 Multiply quadword with integer overflow enableOpr 1C.31 Pixel error Mem Load SfloatingOpr 1C.36 Pack words to bytes Mfc 18.E000 Read and clear Mbr 1A.2 Return from subroutineMfc 18.C000 Read process cycle counter 18.F000 Read and set Opr 10.02 Scaled add longword byReserved Opcodes Reserved OpcodesOpcodes Reserved for Compaq Ieee Floating-Point Instructions Ieee Floating-Point InstructionsOpcodes Reserved for PALcode 08B 00B 04B 18B 10B 14B02B 06B 12B 16BIndependent Floating-Point Instructions VAX Floating-Point InstructionsVAX Floating-Point Instructions Opcode Summary Opcode SummaryMem Table A-9explains the symbols used in Table A-8 Mem ResIeee floating-point instruction opcodes Floating-point operate instruction opcodesIeee Floating-Point Conformance Ieee Floating-Point Conformance14Alpha Instruction Set Table A-11 Exceptional Input and Output Conditions Alpha Instruction Set A-1516Alpha Instruction Set Cmptlt Cmptle Input Cmpteq Cmptun InputAlpha Instruction Set A-17 Fbeq Fbne Fblt Fble Fbgt Fbge LDS LDT STS STT Cpys Cpysn 21264/EV68A Boundary-Scan Register Boundary-Scan RegisterBoundary-Scan Register Pllvdd21264/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 Serial Icache Load Predecode Values C-1Page PALcode Restrictions and Guidelines PALcode Restrictions and Guidelines D-12PALcode Restrictions and Guidelines PALcode Restrictions and Guidelines D-3 4PALcode Restrictions and Guidelines PALcode Restrictions and Guidelines D-5 Initwritemany6PALcode Restrictions and Guidelines PALcode Restrictions and Guidelines D-7 8PALcode Restrictions and Guidelines Restriction 7 Replay Trap, Interrupt Code Sequence, and STF PALcode Restrictions and Guidelines D-9Restriction 10 Duplicate IPR Mode Bits Restriction 9 PALmode Istream Address RangesRestriction 9 PALmode Istream Address Ranges 10PALcode Restrictions and GuidelinesRestriction 11 Ibox IPR Update Synchronization Restriction 11 Ibox IPR Update SynchronizationRestriction 13 DTB Fill Flow Collision Restriction 14 HwretGuideline 20 Ictlsbe Stream Buffer Enable Guideline 16 JSR-BAD VARestriction 21 HWRET/STALL After Hwmtpr ASN0/ASN1 Guideline 16 JSR-BAD VARestriction 22 HWRET/STALL After Hwmtpr IS0/IS1 Restriction 22 HWRET/STALL After Hwmtpr IS0/IS1PALcode Restrictions and Guidelines D-13 Restriction 25 Hwmtpr Itbia After Reset Guideline 26 Conditional Branches in PALcodeRestriction 24 HWRET/STALL After Hwmtpr ICFLUSH, Icflushasm 14PALcode Restrictions and GuidelinesRestriction 30 Hwmtpr and Hwmfpr to the Cbox CSR Guideline 29 JSR, JMP, RET, and Jsrcor in PALcodePALcode Restrictions and Guidelines D-15 Restriction 30 Hwmtpr and Hwmfpr to the Cbox CSR 16PALcode Restrictions and GuidelinesRestriction 31 ICTLVA48 Update Restriction 32 Pctrctl UpdateRestriction 31 ICTLVA48 Update PALcode Restrictions and Guidelines D-17Guideline 35 Hwintclr Update Restriction 33 Hwld Physical/Lock UseRestriction 36 Updating Ictlsde Restriction 37 Updating VACTLVA48Restriction 40 Scrubbing a Single-Bit Error PALcode Restrictions and Guidelines D-19Restriction 40 Scrubbing a Single-Bit Error 20PALcode Restrictions and GuidelinesRestriction 43 No Trappable Instructions Along with Restriction 42 Updating VACTL, CCCTL, or CC IPRsPALcode Restrictions and Guidelines D-21 Restriction 47 Cache Eviction for Single-Bit Cache Errors 22PALcode Restrictions and GuidelinesRestriction 47 Cache Eviction for Single-Bit Cache Errors PALcode Restrictions and Guidelines D-2324PALcode Restrictions and Guidelines Forwarding Clock Pin Groupings 21264/EV68A-to-Bcache Pin InterfaceTable E-1 Bcache Forwarding Clock Pin Groupings Late-Write Non-Bursting SSRAMs Late-Write Non-Bursting SSRAMsData Pin Usage Tag Pin UsageDual-Data Rate SSRAMs Dual-Data Rate SSRAMsTable E-4 Dual-Data Rate Ssram Data Pin Usage Table E-5 Dual-Data Rate Ssram Tag Pin Usage Trstl421264/EV68A-to-Bcache Pin Interface 21264/EV68A-to-Bcache Pin Interface E-5 Page Glossary BIU BSR Cisc Cmos CPICPU CSRDMA DramDTB DTLFeprom FETFEU FpgaGclk IDUIowb IpgaITB JfetMAF MBOMBZ MipsMSI Naturally AlignedNmos NvramPAL PGAPLA PlccPqfp PromRAM RASRisc ROMRTL SAMSdram SimmSIP SippStram TTLUart UnalignedUnpredictable UvpromVAF VDFWAR WriteblockIndex NumericsIndex-2 Index-3 Index-4 ECC Index-6 Index-7 Index-8 Index-9 Index-10 Index-11 Index-12