Freescale Semiconductor E200z3 Manuale utente

e200z3 Power Architecture™

Core Reference Manual

Supports

e200z3

e200z335

e200z3coreRM

Rev. 2

06/2008

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Freescale Semiconductor iii

Contents

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Number Title

Page

Number

General Information......................................................................................................... viii

Related Documentation...................................................................................................... ix

Terminology Conventions....................................................................................................x

Acronyms and Abbreviations ..............................................................................................x

Chapter 1

e200z335 Core Complex Overview

1.1 Overview of the e200z3 and e200z335............................................................................1-1

1.1.1 Features........................................................................................................................1-4

1.2 Programming Model........................................................................................................ 1-5

1.2.1 Register Set.................................................................................................................. 1-5

1.3 Instruction Set..................................................................................................................1-7

1.4 VLE Category..................................................................................................................1-8

1.5 Interrupts and Exception Handling.................................................................................. 1-8

1.5.1 Interrupt Handling........................................................................................................ 1-9

1.5.2 Interrupt Classes ..........................................................................................................1-9

1.5.3 Interrupt Types........................................................................................................... 1-10

1.5.4 Interrupt Registers...................................................................................................... 1-10

1.6 Microarchitecture Summary .......................................................................................... 1-12

1.6.1 Instruction Unit Features ........................................................................................... 1-13

1.6.2 Integer Unit Features ................................................................................................. 1-13

1.6.3 Load/Store Unit (LSU) Features................................................................................ 1-13

1.6.4 Memory Management Unit (MMU) Features ...........................................................1-14

1.6.5 System Bus (Core Complex Interface) Features........................................................ 1-14

1.6.6 Nexus 32+ Module Features...................................................................................... 1-14

1.7 Legacy Support of PowerPC Architecture..................................................................... 1-14

1.7.1 Instruction Set Compatibility..................................................................................... 1-15

1.7.1.1 User Instruction Set ............................................................................................... 1-15

1.7.1.2 Supervisor Instruction Set...................................................................................... 1-15

1.7.2 Memory Subsystem ................................................................................................... 1-15

1.7.3 Interrupt Handling...................................................................................................... 1-15

1.7.4 Memory Management................................................................................................ 1-16

1.7.5 Reset........................................................................................................................... 1-16

1.7.6 Little-Endian Mode.................................................................................................... 1-16

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Chapter 2

2.1 PowerPC Book E Registers ............................................................................................. 2-4

2.2 e200z3-Specific Registers................................................................................................ 2-6

2.3 e200z3-Specific Device Control Registers...................................................................... 2-7

2.4 Processor Control Registers............................................................................................. 2-7

2.4.1 Machine State Register (MSR).................................................................................... 2-7

2.4.2 Processor ID Register (PIR) ........................................................................................ 2-9

2.4.3 Processor Version Register (PVR)............................................................................. 2-10

2.4.4 System Version Register (SVR)................................................................................. 2-10

2.5 Registers for Integer Operations.................................................................................... 2-11

2.5.1 General-Purpose Registers (GPRs)............................................................................ 2-11

2.5.2 Integer Exception Register (XER)............................................................................. 2-11

2.6 Registers for Branch Operations.................................................................................... 2-12

2.6.1 Condition Register (CR)............................................................................................ 2-12

2.6.1.1 CR Setting for Integer Instructions........................................................................ 2-14

2.6.1.2 CR Setting for Store Conditional Instructions.......................................................2-14

2.6.1.3 CR Setting for Compare Instructions .................................................................... 2-14

2.6.2 Count Register (CTR)................................................................................................ 2-15

2.6.3 Link Register (LR)..................................................................................................... 2-15

2.7 SPE and SPFP APU Registers....................................................................................... 2-16

2.7.1 Signal Processing/Embedded Floating-Point Status and Control

2.7.2 Accumulator (ACC)................................................................................................... 2-19

2.8 Interrupt Registers..........................................................................................................2-19

2.8.1 Interrupt Registers Defined by Book E...................................................................... 2-19

2.8.1.1 Save/Restore Register 0 (SRR0)............................................................................ 2-20

2.8.1.2 Save/Restore Register 1 (SRR1)............................................................................ 2-20

2.8.1.3 Critical Save/Restore Register 0 (CSRR0)............................................................2-20

2.8.1.4 Critical Save/Restore Register 1 (CSRR1)............................................................2-21

2.8.1.5 Data Exception Address Register (DEAR)............................................................ 2-21

2.8.1.6 Interrupt Vector Prefix Register (IVPR)................................................................ 2-21

2.8.1.7 Interrupt Vector Offset Registers (IVORs)............................................................ 2-22

2.9 Exception Syndrome Register (ESR) ............................................................................2-23

2.9.1 VLE Mode Instruction Syndrome..............................................................................2-25

2.9.2 Misaligned Instruction Fetch Syndrome.................................................................... 2-25

2.9.3 Precise External Termination Error Syndrome..........................................................2-25

2.9.4 e200z3-Specific Interrupt Registers........................................................................... 2-26

2.9.4.1 Debug Save/Restore Register 0 (DSRR0)............................................................. 2-26

2.9.4.2 Debug Save/Restore Register 1 (DSRR1)............................................................. 2-26

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2.9.4.3 Machine Check Syndrome Register (MCSR)........................................................ 2-26

2.10 Software-Use SPRs (SPRG0–SPRG7 and USPRG0) ................................................... 2-27

2.11 Timer Registers..............................................................................................................2-28

2.11.1 Timer Control Register (TCR)................................................................................... 2-29

2.11.2 Timer Status Register (TSR)...................................................................................... 2-30

2.11.3 Time Base (TBU and TBL) ....................................................................................... 2-31

2.11.4 Decrementer Register ................................................................................................ 2-33

2.11.5 Decrementer Auto-Reload Register (DECAR)..........................................................2-33

2.12 Debug Registers.............................................................................................................2-34

2.12.1 Debug Address and Value Registers.......................................................................... 2-34

2.12.1.1 Instruction Address Compare Registers (IAC1–IAC4).........................................2-34

2.12.1.2 Data Address Compare Registers (DAC1–DAC2)................................................ 2-35

2.12.1.3 Data Value Compare Registers (DVC1–DVC2) (e200z335 only) ........................ 2-35

2.12.2 Debug Counter Register (DBCNT) ........................................................................... 2-36

2.12.3 Debug Control and Status Registers (DBCR0–DBCR3)...........................................2-36

2.12.3.1 Debug Control Register 0 (DBCR0)...................................................................... 2-36

2.12.3.2 Debug Control Register 1 (DBCR1)...................................................................... 2-39

2.12.3.3 Debug Control Register 2 (DBCR2)...................................................................... 2-41

2.12.3.4 Debug Control Register 3 (DBCR3)...................................................................... 2-43

2.12.3.5 Debug Control Register 4 (DBCR4) (e200z335 only)..........................................2-48

2.12.4 Debug Status Register (DBSR).................................................................................. 2-49

2.12.5 Debug External Resource Control Register (DBERC0)............................................ 2-50

2.13 Hardware Implementation-Dependent Registers........................................................... 2-57

2.13.1 Hardware Implementation-Dependent Register 0 (HID0).........................................2-57

2.13.2 Hardware Implementation-Dependent Register 1 (HID1).........................................2-59

2.14 Branch Target Buffer (BTB) Registers.......................................................................... 2-61

2.14.1 Branch Unit Control and Status Register (BUCSR)..................................................2-61

2.15 L1 Cache Configuration Registers................................................................................. 2-61

2.15.1 L1 Cache Configuration Register 0 (L1CFG0) .........................................................2-61

2.16 MMU Registers.............................................................................................................. 2-62

2.16.1 MMU Control and Status Register 0 (MMUCSR0).................................................. 2-62

2.16.2 MMU Configuration Register (MMUCFG) .............................................................. 2-62

2.16.3 TLB Configuration Registers (TLBnCFG)................................................................ 2-63

2.16.3.1 TLB Configuration Register 0 (TLB0CFG)..........................................................2-63

2.16.3.2 TLB Configuration Register 1 (TLB1CFG)..........................................................2-64

2.16.4 MMU Assist Registers (MAS0–MAS4, MAS6)....................................................... 2-65

2.16.5 Process ID Register (PID0)........................................................................................ 2-69

2.17 Support for Fast Context Switching...............................................................................2-69

2.17.1 Context Control Register (CTXCR) .......................................................................... 2-70

2.18 SPR Register Access...................................................................................................... 2-70

2.18.1 Invalid SPR References ............................................................................................. 2-70

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2.18.2 Synchronization Requirements for SPRs................................................................... 2-70

2.18.3 Special-Purpose Register Summary........................................................................... 2-71

2.18.4 Reset Settings............................................................................................................. 2-74

2.19 Parallel Signature Unit Registers................................................................................... 2-76

2.19.1 Parallel Signature Control Register (PSCR).............................................................. 2-77

2.19.2 Parallel Signature Status Register (PSSR)................................................................. 2-78

2.19.3 Parallel Signature High Register (PSHR).................................................................. 2-78

2.19.4 Parallel Signature Low Register (PSLR)................................................................... 2-79

2.19.5 Parallel Signature Counter Register (PSCTR)...........................................................2-79

2.19.6 Parallel Signature Update High Register (PSUHR) .................................................. 2-80

2.19.7 Parallel Signature Update Low Register (PSULR).................................................... 2-80

Chapter 3

Instruction Model

3.1 Operand Conventions ...................................................................................................... 3-1

3.1.1 Data Organization in Memory and Data Transfers...................................................... 3-1

3.1.2 Alignment and Misaligned Accesses........................................................................... 3-1

3.1.3 e200z3 Floating-Point Implementation ....................................................................... 3-2

3.2 Unsupported Instructions and Instruction Forms.............................................................3-2

3.3 Optionally Supported Instructions and Instruction Forms...............................................3-2

3.4 Implementation-Specific Instructions.............................................................................. 3-3

3.5 BookE Instruction Extensions ......................................................................................... 3-3

3.6 Memory Access Alignment Support................................................................................ 3-4

3.7 Memory Synchronization and Reservation Instructions.................................................. 3-4

3.8 Branch Prediction ............................................................................................................3-5

3.9 Interruption of Instructions by Interrupt Requests........................................................... 3-5

3.10 e200z3-Specific Instructions............................................................................................ 3-6

3.10.1 Integer Select APU ...................................................................................................... 3-6

3.10.2 Debug APU..................................................................................................................3-6

3.10.3 Wait APU (e200z335 only).......................................................................................... 3-6

3.10.4 Volatile Context Save/Restore APU (e200z335 only).................................................3-7

3.10.5 SPE APU Instructions.................................................................................................. 3-7

3.10.6 Embedded Vector and Scalar Single-Precision Floating-Point APU

Instructions ............................................................................................................ 3-15

3.10.6.1 Options for Embedded Floating-Point APU Implementations.............................. 3-16

3.11 Unimplemented SPRs and Read-Only SPRs................................................................. 3-16

3.12 Invalid Instruction Forms............................................................................................... 3-17

3.13 Instruction Summary...................................................................................................... 3-17

3.13.1 Instruction Index Sorted by Mnemonic..................................................................... 3-18

3.13.2 Instruction Index Sorted by Opcode.......................................................................... 3-29

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Chapter 4

Interrupts and Exceptions

4.1 Overview.......................................................................................................................... 4-1

4.2 e200z3 Interrupts ............................................................................................................. 4-2

4.3 Exception Syndrome Register (ESR) ..............................................................................4-4

4.4 Machine State Register (MSR)........................................................................................ 4-5

4.4.1 Machine Check Syndrome Register (MCSR).............................................................. 4-7

4.4.1.1 Interrupt Vector Prefix Register (IVPR).................................................................. 4-8

4.5 Interrupt Vector Offset Registers (IVORn)...................................................................... 4-8

4.6 Interrupt Definitions ...................................................................................................... 4-10

4.6.1 Critical Input Interrupt (IVOR0)................................................................................ 4-10

4.6.2 Machine Check Interrupt (IVOR1)............................................................................ 4-11

4.6.2.1 Machine Check Interrupt Enabled (MSR[ME]=1)................................................ 4-11

4.6.2.2 Checkstop State ..................................................................................................... 4-12

4.6.2.3 Non-Maskable Interrupts (NMI) (e200z335 only)................................................ 4-13

4.6.3 Data Storage Interrupt (IVOR2) ................................................................................ 4-13

4.6.4 Instruction Storage Interrupt (IVOR3) ...................................................................... 4-14

4.6.5 External Input Interrupt (IVOR4).............................................................................. 4-15

4.6.6 Alignment Interrupt (IVOR5).................................................................................... 4-16

4.6.7 Program Interrupt (IVOR6) ....................................................................................... 4-16

4.6.8 Floating-Point Unavailable Interrupt (IVOR7).......................................................... 4-17

4.6.9 System Call Interrupt (IVOR8).................................................................................. 4-18

4.6.10 Auxiliary Processor Unavailable Interrupt (IVOR9).................................................4-18

4.6.11 Decrementer Interrupt (IVOR10) .............................................................................. 4-19

4.6.12 Fixed-Interval Timer Interrupt (IVOR11).................................................................. 4-19

4.6.13 Watchdog Timer Interrupt (IVOR12) ........................................................................ 4-20

4.6.14 Data TLB Error Interrupt (IVOR13) ......................................................................... 4-21

4.6.15 Instruction TLB Error Interrupt (IVOR14)................................................................ 4-21

4.6.16 Debug Interrupt (IVOR15) ........................................................................................ 4-22

4.6.17 System Reset..............................................................................................................4-25

4.6.18 SPE APU Unavailable Interrupt (IVOR32)............................................................... 4-26

4.6.19 SPE Floating-Point Data Interrupt (IVOR33) ...........................................................4-27

4.6.20 SPE Floating-Point Round Interrupt (IVOR34) ........................................................ 4-27

4.7 Exception Recognition and Priorities ............................................................................ 4-28

4.7.1 Interrupt Priorities...................................................................................................... 4-29

4.8 Interrupt Processing....................................................................................................... 4-32

4.8.1 Enabling and Disabling Exceptions........................................................................... 4-33

4.8.2 Returning from an Interrupt Handler......................................................................... 4-33

4.9 Process Switching.......................................................................................................... 4-34

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Chapter 5

Memory Management Unit

5.1 Overview.......................................................................................................................... 5-1

5.1.1 MMU Features............................................................................................................. 5-1

5.1.2 TLB Entry Maintenance Features Summary ............................................................... 5-1

5.2 Effective-to-Real Address Translation............................................................................. 5-2

5.2.1 Effective Addresses ..................................................................................................... 5-4

5.2.2 Address Spaces ............................................................................................................ 5-4

5.2.3 Virtual Addresses and Process ID................................................................................ 5-4

5.2.4 Translation Flow.......................................................................................................... 5-5

5.2.5 Permissions..................................................................................................................5-6

5.3 Translation Lookaside Buffer .......................................................................................... 5-7

5.3.1 IPROT Invalidation Protection in TLB1 ..................................................................... 5-8

5.3.2 Replacement Algorithm for TLB1............................................................................... 5-8

5.3.3 The G Bit (of WIMGE) ............................................................................................... 5-9

5.3.4 TLB Entry Field Summary.......................................................................................... 5-9

5.4 Software Interface and TLB Instructions....................................................................... 5-10

5.5 TLB Operations ............................................................................................................. 5-11

5.5.1 Translation Reload..................................................................................................... 5-11

5.5.2 Reading the TLB........................................................................................................ 5-12

5.5.3 Writing the TLB......................................................................................................... 5-12

5.5.4 Searching the TLB..................................................................................................... 5-12

5.5.5 TLB Coherency Control ............................................................................................ 5-12

5.5.6 TLB Miss Exception Update ..................................................................................... 5-12

5.5.7 TLB Load on Reset.................................................................................................... 5-13

5.6 MMU Configuration and Control Registers.................................................................. 5-13

5.6.1 MMU Configuration Register (MMUCFG) .............................................................. 5-13

5.6.2 TLB0 and TLB1 Configuration Registers ................................................................. 5-14

5.6.3 Data Exception Address Register (DEAR)................................................................ 5-14

5.6.4 MMU Control and Status Register 0 (MMUCSR0)..................................................5-14

5.6.5 MMU Assist Registers (MAS) .................................................................................. 5-14

5.6.5.1 MAS Registers Summary ...................................................................................... 5-14

5.6.5.2 MAS Register Updates .......................................................................................... 5-14

5.7 Effect of Hardware Debug on MMU Operation............................................................5-15

Chapter 6

Instruction Pipeline and Execution Timing

6.1 Overview of Operation .................................................................................................... 6-1

6.1.1 Control Unit.................................................................................................................6-2

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6.1.2 Instruction Unit............................................................................................................ 6-2

6.1.3 Branch Unit..................................................................................................................6-3

6.1.4 Instruction Decode Unit............................................................................................... 6-3

6.1.5 Exception Handling ..................................................................................................... 6-3

6.2 Execution Units................................................................................................................6-3

6.2.1 Integer Execution Unit................................................................................................. 6-3

6.2.2 Load/Store Unit............................................................................................................6-3

6.3 Instruction Pipeline.......................................................................................................... 6-4

6.3.1 Description of Pipeline Stages..................................................................................... 6-4

6.3.2 Instruction Buffers ....................................................................................................... 6-5

6.3.3 Single-Cycle Instruction Pipeline Operation ............................................................... 6-7

6.3.4 Basic Load and Store Instruction Pipeline Operation..................................................6-8

6.3.5 Change-of-Flow Instruction Pipeline Operation..........................................................6-9

6.3.6 Basic Multi-Cycle Instruction Pipeline Operation..................................................... 6-10

6.3.7 Additional Examples of Instruction Pipeline Operation for Load and Store.............6-10

6.3.8 Move to/from SPR Instruction Pipeline Operation.................................................... 6-11

6.4 Stalls Caused by Accessing SPRs.................................................................................. 6-13

6.5 Instruction Serialization................................................................................................. 6-13

6.6 Interrupt Recognition and Exception Processing...........................................................6-14

6.7 Instruction Timings........................................................................................................ 6-16

6.7.1 SPE and Embedded Floating-Point Instruction Timing.............................................6-21

6.7.1.1 SPE Integer Simple Instructions Timing ............................................................... 6-22

6.7.1.2 SPE Load and Store Instruction Timing................................................................6-23

6.7.1.3 SPE Complex Integer Instruction Timing .............................................................6-24

6.7.1.4 Vector Floating-Point APU Instruction Timing.....................................................6-27

6.7.1.5 SPE Scalar Floating-Point Instruction Timing ......................................................6-28

6.8 Operand Placement on Performance.............................................................................. 6-29

Chapter 7

External Core Complex Interfaces

7.1 Overview.......................................................................................................................... 7-1

7.2 Signal Index.....................................................................................................................7-2

7.3 Signal Descriptions..........................................................................................................7-7

7.3.1 Processor State Signals.............................................................................................. 7-20

7.3.2 JTAG ID Signals........................................................................................................ 7-29

7.4 Internal Signals ..............................................................................................................7-30

7.5 Timing Diagrams ........................................................................................................... 7-30

7.5.1 Processor Instruction/Data Transfers......................................................................... 7-30

7.5.1.1 Basic Read Transfer Cycles................................................................................... 7-32

7.5.1.2 Read Transfer with Wait State ............................................................................... 7-33

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7.5.1.3 Basic Write Transfer Cycles .................................................................................. 7-34

7.5.1.4 Write Transfer with Wait States............................................................................. 7-35

7.5.1.5 Read and Write Transfers ...................................................................................... 7-36

7.5.1.6 Misaligned Accesses.............................................................................................. 7-39

7.5.2 Burst Accesses........................................................................................................... 7-43

7.5.3 Address Retraction..................................................................................................... 7-49

7.5.3.1 Error Termination Operation ................................................................................. 7-51

7.5.4 Address Retraction..................................................................................................... 7-55

7.5.5 Power Management ................................................................................................... 7-57

7.5.6 Interrupt Interface ...................................................................................................... 7-58

Chapter 8

Power Management

8.1 Overview.......................................................................................................................... 8-1

8.1.1 Power Management Signals......................................................................................... 8-2

8.1.2 Power Management Control Bits................................................................................. 8-3

8.1.3 Software Considerations for Power Management.......................................................8-3

8.1.4 Debug Considerations for Power Management...........................................................8-3

Chapter 9

Debug Support

9.1 Introduction...................................................................................................................... 9-2

9.2 Overview.......................................................................................................................... 9-2

9.2.1 Software Debug Facilities............................................................................................ 9-2

9.2.1.1 PowerPC Book E Compatibility.............................................................................. 9-3

9.2.2 Additional Debug Facilities......................................................................................... 9-3

9.2.3 Hardware Debug Facilities .......................................................................................... 9-3

9.2.4 Sharing Debug Resources by Software/Hardware in e200z335.................................. 9-4

9.2.4.1 Simultaneous Hardware and Software Debug Event Handing in e200z335...........9-4

9.3 Debug Registers............................................................................................................... 9-5

9.4 Software Debug Events and Exceptions.......................................................................... 9-6

9.5 External Debug Support................................................................................................. 9-11

9.5.1 OnCE Introduction..................................................................................................... 9-12

9.5.2 JTAG/OnCE Signals.................................................................................................. 9-15

9.5.3 OnCE Internal Interface Signals................................................................................ 9-16

9.5.3.1 CPU Address and Attributes.................................................................................. 9-16

9.5.3.2 CPU Data............................................................................................................... 9-16

9.5.4 OnCE Interface Signals ............................................................................................. 9-16

9.5.5 OnCE Controller and Serial Interface........................................................................ 9-18

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