RCPU
RISC CENTRAL PROCESSING UNIT
REFERENCE MANUAL
Revision 1
Revised 1 February 1999
ï›™ Copyright 2001 MOTOROLA; All Rights Reserved
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TABLE OF CONTENTS
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RCPU TABLE OF CONTENTS MOTOROLA
REFERENCE MANUAL Rev. 1 February 1999 iii
PREFACE
Section 1
OVERVIEW
1.1 RCPU Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
1.1.1 RCPU Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
1.1.2 RCPU Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
1.1.3 Instruction Sequencer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
1.1.4 Independent Execution Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
1.1.4.1 Branch Processing Unit (BPU) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
1.1.4.2 Integer Unit (IU) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
1.1.4.3 Floating-Point Unit (FPU) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
1.1.4.4 Load/Store Unit (LSU) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
1.1.5 Instruction Cache . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9
1.1.6 Instruction Pipeline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9
1.1.7 Development Support. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10
1.2 Levels of the PowerPC Architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11
1.3 The RCPU as a PowerPC Implementation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11
1.3.1 PowerPC Registers and Programming Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11
1.3.1.1 General-Purpose Registers (GPRs). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12
1.3.1.2 Floating-Point Registers (FPRs). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12
1.3.1.3 Condition Register (CR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12
1.3.1.4 Floating-Point Status and Control Register (FPSCR). . . . . . . . . . . . . . . . . . . . . . . 1-12
1.3.1.5 Machine State Register (MSR). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12
1.3.1.6 Special-Purpose Registers (SPRs) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12
1.3.1.7 User-Level SPRs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12
1.3.1.8 Supervisor-Level SPRs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13
1.3.2 Instruction Set and Addressing Modes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13
1.3.2.1 PowerPC Instruction Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14
1.3.2.2 PowerPC Addressing Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15
1.3.2.3 RCPU Instruction Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15
1.3.3 PowerPC Exception Model. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-16
Section 2
REGISTERS
2.1 Programming Models. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
2.2 PowerPC UISA Register Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
2.2.1 General Purpose Registers (GPRs) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
2.2.2 Floating-Point Registers (FPRs). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
2.2.3 Floating-Point Status and Control Register (FPSCR). . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
2.2.4 Condition Register (CR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
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2.2.4.1 Condition Register CR0 Field Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
2.2.4.2 Condition Register CR1 Field Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
2.2.4.3 Condition Register CRn Field — Compare Instruction. . . . . . . . . . . . . . . . . . . . . . 2-10
2.2.5 Integer Exception Register (XER) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
2.2.6 Link Register (LR). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
2.2.7 Count Register (CTR). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12
2.3 PowerPC VEA Register Set — Time Base . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12
2.4 PowerPC OEA Register Set. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13
2.4.1 Machine State Register (MSR). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13
2.4.2 DAE/Source Instruction Service Register (DSISR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16
2.4.3 Data Address Register (DAR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16
2.4.4 Time Base Facility (TB) — OEA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16
2.4.5 Decrementer Register (DEC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-17
2.4.6 Machine Status Save/Restore Register 0 (SRR0) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-18
2.4.7 Machine Status Save/Restore Register 1 (SRR1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-19
2.4.8 General SPRs (SPRG0–SPRG3). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-19
2.4.9 Processor Version Register (PVR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-20
2.4.10 Implementation-Specific SPRs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-20
2.4.10.1 EIE, EID, and NRI Special-Purpose Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . 2-20
2.4.10.2 Instruction-Cache Control Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-21
2.4.10.3 Development Support Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-21
2.4.10.4 Floating-Point Exception Cause Register (FPECR) . . . . . . . . . . . . . . . . . . . . . . . 2-22
Section 3
OPERAND CONVENTIONS
3.1 Data Alignment and Memory Organization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
3.2 Byte Ordering. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
3.2.1 Structure Mapping Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
3.2.1.1 Big-Endian Mapping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
3.2.1.2 Little-Endian Mapping. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
3.2.2 Data Memory in Little-Endian Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
3.2.2.1 Aligned Scalars. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
3.2.2.2 Misaligned Scalars . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
3.2.2.3 String Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
3.2.2.4 Load and Store Multiple Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8
3.2.3 Instruction Memory Addressing in Little-Endian Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8
3.2.4 Input/Output in Little-Endian Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10
3.3 Floating-Point Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10
3.3.1 Floating-Point Data Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10
3.3.2 Value Representation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12
3.3.3 Normalized Numbers (±NORM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-13
3.3.4 Zero Values (±0). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14
3.3.5 Denormalized Numbers (±DENORM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14
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cale Semiconductor,
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RCPU / RCPU TABLE OF CONTENTS MOTOROLA
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3.3.6 Infinities (±×). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15
3.3.7 Not a Numbers (NaNs) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15
3.3.8 Sign of Result . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-16
3.3.9 Normalization and Denormalization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-17
3.3.10 Data Handling and Precision . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-17
3.3.11 Rounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-19
3.4 Floating-Point Execution Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-21
3.4.1 Execution Model for IEEE Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-22
3.4.2 Execution Model for Multiply-Add Type Instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-24
3.4.3 Non-IEEE Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-25
3.4.4 Working Without the Software Envelope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-26
Section 4
ADDRESSING MODES AND INSTRUCTION SET SUMMARY
4.1 Memory Addressing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
4.1.1 Memory Operands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
4.1.2 Addressing Modes and Effective Address Calculation . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
4.2 Classes of Instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
4.2.1 Definition of Boundedly Undefined . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
4.2.2 Defined Instruction Class . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
4.2.3 Illegal Instruction Class. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
4.2.4 Reserved Instruction Class. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
4.3 Integer Instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
4.3.1 Integer Arithmetic Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
4.3.2 Integer Compare Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-11
4.3.3 Integer Logical Instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-12
4.3.4 Integer Rotate and Shift Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-14
4.3.4.1 Integer Rotate Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-16
4.3.4.2 Integer Shift Instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-17
4.4 Floating-Point Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-19
4.4.1 Floating-Point Arithmetic Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-19
4.4.2 Floating-Point Multiply-Add Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-22
4.4.3 Floating-Point Rounding and Conversion Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . 4-25
4.4.4 Floating-Point Compare Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-27
4.4.5 Floating-Point Status and Control Register Instructions. . . . . . . . . . . . . . . . . . . . . . . . . 4-28
4.5 Load and Store Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-30
4.5.1 Integer Load and Store Address Generation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-30
4.5.1.1 Register Indirect with Immediate Index Addressing . . . . . . . . . . . . . . . . . . . . . . . . 4-30
4.5.1.2 Register Indirect with Index Addressing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-31
4.5.1.3 Register Indirect Addressing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-32
4.5.2 Integer Load Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-33
4.5.3 Integer Store Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-36
4.5.4 Integer Load and Store with Byte Reversal Instructions. . . . . . . . . . . . . . . . . . . . . . . . . 4-37
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4.5.5 Integer Load and Store Multiple Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-38
4.5.6 Integer Move String Instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-39
4.5.7 Floating-Point Load and Store Address Generation. . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-41
4.5.7.1 Register Indirect with Immediate Index Addressing . . . . . . . . . . . . . . . . . . . . . . . . 4-41
4.5.7.2 Register Indirect with Index Addressing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-41
4.5.8 Floating-Point Load Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-42
4.5.8.1 Double-Precision Conversion for Floating-Point Load Instructions . . . . . . . . . . . . 4-43
4.5.8.2 Floating-Point Load Single Operands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-44
4.5.9 Floating-Point Store Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-44
4.5.9.1 Double-Precision Conversion for Floating-Point Store Instructions . . . . . . . . . . . . 4-46
4.5.9.2 Floating-Point Store-Single Operands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-47
4.5.10 Floating-Point Move Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-47
4.6 Flow Control Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-48
4.6.1 Branch Instruction Address Calculation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-49
4.6.1.1 Branch Relative Address Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-49
4.6.1.2 Branch Conditional Relative Address Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-50
4.6.1.3 Branch to Absolute Address Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-51
4.6.1.4 Branch Conditional to Absolute Address Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-52
4.6.1.5 Branch Conditional to Link Register Address Mode. . . . . . . . . . . . . . . . . . . . . . . . 4-52
4.6.1.6 Branch Conditional to Count Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-53
4.6.2 Conditional Branch Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-54
4.6.2.1 BO Operand and Branch Prediction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-54
4.6.2.2 BI Operand . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-56
4.6.2.3 Simplified Mnemonics for Conditional Branches . . . . . . . . . . . . . . . . . . . . . . . . . . 4-56
4.6.3 Branch Instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-56
4.6.4 Condition Register Logical Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-57
4.6.5 System Linkage Instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-58
4.6.6 Simplified Mnemonics for Branch and Flow Control Instructions . . . . . . . . . . . . . . . . . . 4-59
4.6.7 Trap Instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-59
4.7 Processor Control Instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-60
4.7.1 Move to/from Machine State Register and Condition Register Instructions . . . . . . . . . . 4-60
4.7.2 Move to/from Special Purpose Register Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-61
4.7.3 Move from Time Base Instruction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-64
4.8 Memory Synchronization Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-65
4.9 Memory Control Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-68
4.10 Recommended Simplified Mnemonics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-68
Section 5
INSTRUCTION CACHE
5.1 Instruction Cache Organization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
5.2 Programming Model. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3
5.2.1 I-Cache Control and Status Register (ICCST) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3
5.2.2 I-Cache Address Register (ICADR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-5
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cale Semiconductor,
I
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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5.2.3 I-Cache Data Register (ICDAT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-5
5.3 Instruction Cache Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-5
5.3.1 Cache Hit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6
5.3.2 Cache Miss. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6
5.3.3 Instruction Fetch on a Predicted Path . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6
5.4 Cache Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-7
5.4.1 Instruction Cache Block Invalidate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-7
5.4.2 Invalidate All . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-8
5.4.3 Load and Lock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-8
5.4.4 Unlock Line. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-9
5.4.5 Unlock All . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-9
5.4.6 Cache Enable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-9
5.4.7 Cache Disable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-9
5.4.8 Cache Inhibit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-9
5.4.9 Cache Read . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-10
5.5 I-Cache and On-Chip Memories with Zero Wait States . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-11
5.6 Cache Coherency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-11
5.7 Updating Code and Attributes of Memory Regions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-11
5.8 Reset Sequence. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-11
5.9 Debugging Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-12
5.9.1 Running a Debug Routine from the I-Cache . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-12
5.9.2 Instruction Fetch from the Development Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-12
Section 6
EXCEPTIONS
6.1 Exception Classes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2
6.1.1 Ordered and Unordered Exceptions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2
6.1.2 Synchronous, Precise Exceptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2
6.1.3 Asynchronous Exceptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-4
6.1.3.1 Asynchronous, Maskable Exceptions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-5
6.1.3.2 Asynchronous, Non-Maskable Exceptions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-5
6.2 Exception Vector Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-5
6.3 Precise Exception Model Implementation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-7
6.4 Implementation of Asynchronous Exceptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-8
6.5 Recovery from Exceptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-9
6.5.1 Recovery from Ordered Exceptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-9
6.5.2 Recovery from Unordered Exceptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-9
6.5.3 Commands to Alter MSR[EE] and MSR[RI] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-10
6.6 Exception Order and Priority . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-10
6.7 Ordering of Synchronous, Precise Exceptions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-12
6.8 Exception Processing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-13
6.8.1 Enabling and Disabling Exceptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-16
6.8.2 Steps for Exception Processing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-16
Frees
cale Semiconductor,
I
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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6.8.3 DAR, DSISR, and BAR Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-17
6.8.4 Returning from Supervisor Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-18
6.9 Process Switching . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-18
6.10 Exception Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-18
6.11 Exception Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-20
6.11.1 Reset Exception (0x0100) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-20
6.11.2 Machine Check Exception (0x00200). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-21
6.11.2.1 Machine Check Exception Enabled . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-21
6.11.2.2 Checkstop State . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-22
6.11.2.3 Machine-Check Exceptions and Debug Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-22
6.11.3 External Interrupt (0x00500). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-22
6.11.4 Alignment Exception (0x00600) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-23
6.11.4.1 Interpretation of the DSISR as Set by an Alignment Exception . . . . . . . . . . . . . . 6-24
6.11.5 Program Exception (0x00700) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-26
6.11.6 Floating-Point Unavailable Exception (0x00800) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-28
6.11.7 Decrementer Exception (0x00900). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-29
6.11.8 System Call Exception (0x00C00) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-29
6.11.9 Trace Exception (0x00D00) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-30
6.11.10 Floating-Point Assist Exception (0x00E00) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-31
6.11.10.1 Floating-Point Software Envelope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-31
6.11.10.2 Floating-Point Assist for Denormalized Operands . . . . . . . . . . . . . . . . . . . . . . . 6-32
6.11.10.3 Synchronized Ignore Exceptions (SIE) Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . 6-34
6.11.10.4 Floating-Point Exception Cause Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-34
6.11.10.5 Floating-Point Enabled Exceptions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-36
6.11.10.6 Invalid Operation Exception Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-42
6.11.10.7 Zero Divide Exception Condition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-43
6.11.10.8 Overflow Exception Condition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-44
6.11.10.9 Underflow Exception Condition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-44
6.11.10.10 Inexact Exception Condition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-45
6.11.11 Software Emulation Exception (0x01000) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-46
6.11.12 Data Breakpoint Exception (0x01C00) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-47
6.11.13 Instruction Breakpoint Exception (0x01D00) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-48
6.11.14 Maskable External Breakpoint Exception (0x01E00) . . . . . . . . . . . . . . . . . . . . . . . . . 6-49
6.11.15 Non-Maskable External Breakpoint Exception (0x01F00) . . . . . . . . . . . . . . . . . . . . . 6-49
Section 7
INSTRUCTION TIMING
7.1 Instruction Flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1
7.1.1 Instruction Sequencer Data Path . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2
7.1.2 Instruction Issue . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-3
7.1.3 Basic Instruction Pipeline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-3
7.2 Execution Unit Timing Details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-5
7.2.1 Integer Unit (IU) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-5
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cale Semiconductor,
I
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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RCPU / RCPU TABLE OF CONTENTS MOTOROLA
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7.2.1.1 Update of the XER During Divide Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-6
7.2.2 Floating Point Unit (FPU) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-6
7.2.3 Load/Store Unit (LSU) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-6
7.2.3.1 Load/Store Instruction Issue. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-7
7.2.3.2 Load/Store Synchronizing Instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-7
7.2.3.3 Load/Store Instruction Timing Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-7
7.2.3.4 Bus Cycles for String Instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-8
7.2.3.5 Stalls During Floating-Point Store Instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-8
7.2.4 Branch Processing Unit (BPU) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-9
7.3 Serialization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-9
7.3.1 Execution Serialization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-9
7.3.2 Fetch Serialization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-10
7.4 Context Synchronization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-10
7.5 Implementation of Special-Purpose Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-10
7.6 Instruction Execution Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-11
7.7 Instruction Execution Timing Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-16
7.7.1 Load from Internal Memory Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-16
7.7.2 Write-Back Arbitration Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-17
7.7.3 Load with Private Write-Back Bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-18
7.7.4 Fastest External Load Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-19
7.7.5 History Buffer Full Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-20
7.7.6 Store and Floating-Point Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-21
7.7.7 Branch Folding Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-22
7.7.8 Branch Prediction Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-23
Section 8
DEVELOPMENT SUPPORT
8.1 Program Flow Tracking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1
8.1.1 Indirect Change-of-Flow Cycles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-2
8.1.1.1 Marking the Indirect Change-of-Flow Attribute. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-3
8.1.1.2 Sequential Instructions with the Indirect Change-of-Flow Attribute . . . . . . . . . . . . . 8-3
8.1.2 Instruction Fetch Show Cycle Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-4
8.1.3 Program Flow-Tracking Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-5
8.1.3.1 Instruction Queue Status Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-5
8.1.3.2 History Buffer Flush Status Pins. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-6
8.1.3.3 Flow-Tracking Status Pins in Debug Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-6
8.1.3.4 Cycle Type, Write/Read, and Address Type Pins . . . . . . . . . . . . . . . . . . . . . . . . . . 8-7
8.1.4 External Hardware During Program Trace . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-8
8.1.4.1 Back Trace . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-8
8.1.4.2 Window Trace. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-8
8.1.4.3 Synchronizing the Trace Window to Internal CPU Events . . . . . . . . . . . . . . . . . . . . 8-8
8.1.4.4 Detecting the Trace Window Starting Address. . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-10
8.1.4.5 Detecting the Assertion or Negation of VSYNC . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-10
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cale Semiconductor,
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8.1.4.6 Detecting the Trace Window Ending Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-10
8.1.5 Compress . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-11
8.2 Watchpoint and Breakpoint Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-11
8.2.1 Watchpoints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-12
8.2.1.1 Restrictions on Watchpoint Detection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-13
8.2.1.2 Byte and Half-Word Working Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-14
8.2.1.3 Generating Six Compare Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-15
8.2.1.4 I-Bus Support Detailed Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-16
8.2.1.5 L-Bus Support Detailed Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-17
8.2.1.6 Treating Floating-Point Numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-19
8.2.2 Internal Breakpoints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-20
8.2.2.1 Breakpoint Counters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-20
8.2.2.2 Trap-Enable Programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-20
8.2.2.3 Ignore First Match. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-21
8.2.3 External Breakpoints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-21
8.2.4 Breakpoint Masking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-21
8.3 Development Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-22
8.3.1 Development Port Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-23
8.3.1.1 Development Serial Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-23
8.3.1.2 Development Serial Data In . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-24
8.3.1.3 Development Serial Data Out. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-25
8.3.2 Development Port Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-25
8.3.2.1 Development Port Shift Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-26
8.3.2.2 Trap Enable Control Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-26
8.3.3 Development Port Clock Mode Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-26
8.3.4 Development Port Transmissions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-31
8.3.5 Trap-Enable Input Transmissions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-32
8.3.6 CPU Input Transmissions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-32
8.3.7 Serial Data Out of Development Port — Non-Debug Mode . . . . . . . . . . . . . . . . . . . . . . 8-33
8.3.8 Serial Data Out of Development Port — Debug Mode . . . . . . . . . . . . . . . . . . . . . . . . . . 8-33
8.3.8.1 Valid Data Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-34
8.3.8.2 Sequencing Error Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-34
8.3.8.3 CPU Exception Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-35
8.3.8.4 Null Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-35
8.3.9 Use of the Ready Bit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-35
8.4 Debug Mode Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-36
8.4.1 Enabling Debug Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-36
8.4.2 Entering Debug Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-37
8.4.3 Debug Mode Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-38
8.4.4 Freeze Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-39
8.4.5 Exiting Debug Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-39
8.4.6 Checkstop State and Debug Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-39
8.5 Development Port Transmission Sequence. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-40
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8.5.1 Port Usage in Debug Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-40
8.5.2 Debug Mode Sequence Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-42
8.5.3 Port Usage in Normal (Non-Debug) Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-43
8.6 Examples of Debug Mode Sequences. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-44
8.6.1 Prologue Instruction Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-44
8.6.2 Epilogue Instruction Sequence. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-44
8.6.3 Peek Instruction Sequence. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-45
8.6.4 Poke Instruction Sequence. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-45
8.7 Software Monitor Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-46
8.8 Development Support Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-47
8.8.1 Register Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-48
8.8.2 Comparator A–D Value Registers (CMPA–CMPD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-50
8.8.3 Comparator E–F Value Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-50
8.8.4 Comparator G–H Value Registers (CMPG–CMPH) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-51
8.8.5 I-Bus Support Control Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-51
8.8.6 L-Bus Support Control Register 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-53
8.8.7 L-Bus Support Control Register 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-55
8.8.8 Breakpoint Counter A Value and Control Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-57
8.8.9 Breakpoint Counter B Value and Control Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-58
8.8.10 Exception Cause Register (ECR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-58
8.8.11 Debug Enable Register (DER) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-60
Section 9
INSTRUCTION SET
9.1 Instruction Formats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-1
9.1.1 Split Field Notation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-1
9.1.2 Instruction Fields . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-1
9.1.3 Notation and Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-3
9.2 RCPU Instruction Set. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-6
Appendix A
INSTRUCTION SET LISTINGS
Appendix B
MULTIPLE-PRECISION SHIFTS
Appendix C
FLOATING-POINT MODELS AND CONVERSIONS
C.1 Conversion from Floating-Point Number to Signed Fixed-Point Integer Word . . . . . . . . . . . . . C-1
C.2 Conversion from Floating-Point Number to Unsigned Fixed-Point Integer Word . . . . . . . . . . . C-1
C.3 Floating-Point Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-1
C.3.1 Floating-Point Round to Single-Precision Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-1
C.3.2 Floating-Point Convert to Integer Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-5
C.4 Floating-Point Convert from Integer Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-8
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cale Semiconductor,
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xii REFERENCE MANUAL
Appendix D
SYNCHRONIZATION PROGRAMMING EXAMPLES
D.1 General Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-1
D.2 Synchronization Primitives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-2
D.2.1 Fetch and No-Op . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-2
D.2.2 Fetch and Store . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-2
D.3 Fetch and Add . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-2
D.3.1 Fetch and AND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-3
D.3.2 Test and Set. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-3
D.4 Compare and Swap. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-3
D.5 List Insertion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-4
Appendix E
SIMPLIFIED MNEMONICS
E.1 Symbols. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-1
E.2 Simplified Mnemonics for Subtract Instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-2
E.2.1 Subtract Immediate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-2
E.2.2 Subtract . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-2
E.3 Simplified Mnemonics for Compare Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-2
E.4 Simplified Mnemonics for Rotate and Shift Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-3
E.5 Simplified Mnemonics for Branch Instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-4
E.5.1 BO and BI Fields . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-5
E.5.2 Basic Branch Mnemonics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-5
E.5.3 Branch Mnemonics Incorporating Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-9
E.5.4 Branch Prediction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-10
E.6 Simplified Mnemonics for Condition Register Logical Instructions . . . . . . . . . . . . . . . . . . . . . E-11
E.7 Simplified Mnemonics for Trap Instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-12
E.8 Simplified Mnemonics for Special-Purpose Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-15
E.9 Recommended Simplified Mnemonics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-16
E.9.1 No-Op. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-16
E.9.2 Load Immediate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-16
E.9.3 Load Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-16
E.9.4 Move Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-17
E.9.5 Complement Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-17
E.9.6 Move to Condition Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-17
GLOSSARY OF TERMS AND ABBREVIATIONS
SUMMARY OF CHANGES
INDEX
Online publishing by JABIS, http://www.jabis.com
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cale Semiconductor,
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Figure Title Page
LIST OF FIGURES
RCPU LIST OF FIGURES MOTOROLA
REFERENCE MANUAL Revised 1 February 1999 xiii
1-1 RCPU-Based Microcontroller ......................................................................... 1-2
1-2 RCPU Block Diagram ..................................................................................... 1-4
1-3 RCPU Instruction Flow ................................................................................... 1-6
1-4 Basic Instruction Pipeline ............................................................................. 1-10
2-1 RCPU Programming Model ............................................................................ 2-2
3-1 Big-Endian Byte Ordering ............................................................................... 3-2
3-2 Big-Endian Mapping of Structure S ................................................................ 3-4
3-3 Little-Endian Mapping of Structure S .............................................................. 3-4
3-4 PowerPC Little-Endian Structure S in Memory ............................................... 3-5
3-5 PowerPC Little-Endian Structure S as Seen by Processor ............................ 3-6
3-6 PowerPC Little-Endian Mode, Word Stored at Address 5 .............................. 3-6
3-7 Word Stored at Little-Endian
Address 5 as Seen by Big-Endian Addressing ........................................... 3-7
3-8 PowerPC Big-Endian
Instruction Sequence as Seen by Processor .............................................. 3-9
3-9 PowerPC Little-Endian
Instruction Sequence as Seen by Processor .............................................. 3-9
3-10 Floating-Point Single-Precision Format ........................................................ 3-10
3-11 Floating-Point Double-Precision Format ....................................................... 3-11
3-12 Biased Exponent Format .............................................................................. 3-12
3-13 Approximation to Real Numbers ................................................................... 3-13
3-14 Format for Normalized Numbers .................................................................. 3-14
3-15 Format for Zero Numbers ............................................................................. 3-14
3-16 Format for Denormalized Numbers .............................................................. 3-14
3-17 Format for Positive and Negative Infinities ................................................... 3-15
3-18 Format for NANs ........................................................................................... 3-15
3-19 Representation of QNaN .............................................................................. 3-16
3-20 Single-Precision Representation in an FPR ................................................. 3-19
3-21 Rounding Flow Diagram ............................................................................... 3-20
3-22 Relation of Z1 and Z2 ................................................................................... 3-21
4-1 Register Indirect with Immediate Index Addressing ..................................... 4-31
4-2 Register Indirect with Index Addressing ....................................................... 4-32
4-3 Register Indirect Addressing ........................................................................ 4-33
4-4 Register Indirect with Immediate Index Addressing ..................................... 4-41
4-5 Register Indirect with Index Addressing ...................................................... 4-42
4-6 Branch Relative Addressing ......................................................................... 4-50
4-7 Branch Conditional Relative Addressing ...................................................... 4-51
4-8 Branch to Absolute Addressing .................................................................... 4-51
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MOTOROLA LIST OF FIGURES RCPU
xiv Revised 1 February 1999 REFERENCE MANUAL
4-9 Branch Conditional to Absolute Addressing ................................................. 4-52
4-10 Branch Conditional to Link Register Addressing .......................................... 4-53
4-11 Branch Conditional to Count Register Addressing ....................................... 4-54
5-1 Instruction Cache Organization ...................................................................... 5-2
5-2 Instruction Cache Data Path ........................................................................... 5-3
6-1 History Buffer Queue ...................................................................................... 6-8
6-2 RCPU Floating-Point Architecture ................................................................ 6-32
6-3 Real Numbers Axis for Denormalized Operands .......................................... 6-33
7-1 Instruction Flow .............................................................................................. 7-2
7-2 Instruction Sequencer Data Path .................................................................... 7-3
7-3 Basic Instruction Pipeline ............................................................................... 7-5
7-4 Number of Bus Cycles Needed for String Instruction Execution .................... 7-8
7-5 Load from Internal Memory Example ........................................................... 7-17
7-6 Write-Back Arbitration Example I .................................................................. 7-17
7-7 Write-Back Arbitration Example II ................................................................. 7-18
7-8 Load with Private Write-Back Bus Example ................................................. 7-19
7-9 External Load Example ................................................................................ 7-20
7-10 History Buffer Full Example .......................................................................... 7-21
7-11 Store and Floating-Point Example ................................................................ 7-22
7-12 Branch Folding Example .............................................................................. 7-23
7-13 Branch Prediction Example .......................................................................... 7-24
8-1 Watchpoint and Breakpoint Support in the RCPU ........................................ 8-12
8-2 Partially Supported Watchpoint/Breakpoint Example ................................... 8-15
8-3 I-Bus Support General Structure .................................................................. 8-16
8-4 L-Bus Support General Structure ................................................................. 8-18
8-5 Development Port Support Logic .................................................................. 8-23
8-6 Development Port Registers and Data Paths ............................................... 8-25
8-7 Enabling Clock Mode Following Reset ......................................................... 8-28
8-8 Asynchronous Clocked Serial Communications ........................................... 8-29
8-9 Synchronous Clocked Serial Communications ............................................. 8-30
8-10 Synchronous Self-Clocked Serial Communications ..................................... 8-31
8-11 Enabling Debug Mode at Reset .................................................................... 8-37
8-12 Entering Debug Mode Following Reset ........................................................ 8-38
8-13 General Port Usage Sequence Diagram ...................................................... 8-43
8-14 Debug Mode Logic ....................................................................................... 8-47
9-1 Instruction Description .................................................................................... 9-6
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Table Title Page
LIST OF TABLES
RCPU LIST OF TABLES MOTOROLA
REFERENCE MANUAL Revised 1 February 1999 xv
1-1 RCPU Execution Units........................................................................................... 1-7
2-1 FPSCR Bit Categories........................................................................................... 2-5
2-2 FPSCR Bit Settings .............................................................................................. 2-5
2-3 Floating-Point Result Flags in FPSCR.................................................................. 2-8
2-4 Bit Settings for CR0 Field of CR ........................................................................... 2-9
2-5 Bit Settings for CR1 Field of CR ........................................................................... 2-9
2-6 CRn Field Bit Settings for Compare Instructions ................................................ 2-10
2-7 Integer Exception Register Bit Definitions .......................................................... 2-11
2-8 Time Base Field Definitions................................................................................ 2-13
2-9 Machine State Register Bit Settings ................................................................... 2-15
2-10 Floating-Point Exception Mode Bits.................................................................. 2-16
2-11 Time Base Field Definitions.............................................................................. 2-17
2-12 Uses of SPRG0–SPRG3 .................................................................................. 2-20
2-13 Processor Version Register Bit Settings........................................................... 2-20
2-14 EIE, EID, AND NRI Registers............................................................................ 2-21
2-15 Instruction Cache Control Registers.................................................................. 2-21
2-16 Development Support Registers........................................................................ 2-22
3-1 Memory Operands................................................................................................ 3-1
3-2 EA Modifications................................................................................................... 3-5
3-3 Load/Store String Instructions .............................................................................. 3-7
3-4 Load/Store Multiple Instructions ........................................................................... 3-8
3-5 IEEE Floating-Point Fields.................................................................................. 3-11
3-6 Recognized Floating-Point Numbers.................................................................. 3-13
3-7 FPSCR Bit Settings — RN Field......................................................................... 3-20
3-8 Interpretation of G, R, and X Bits........................................................................ 3-23
3-9 Location of the Guard, Round and Sticky Bits.................................................... 3-23
4-1 Integer Arithmetic Instructions .............................................................................. 4-6
4-2 Integer Compare Instructions ............................................................................. 4-12
4-3 Integer Logical Instructions................................................................................. 4-13
4-4 Rotate and Shift Operations ............................................................................... 4-15
4-5 Integer Rotate Instructions.................................................................................. 4-16
4-6 Integer Shift Instructions..................................................................................... 4-18
4-7 Floating-Point Arithmetic Instructions ................................................................. 4-19
4-8 Floating-Point Multiply-Add Instructions ............................................................. 4-22
4-9 Floating-Point Rounding and Conversion Instructions........................................ 4-26
4-10 CR Bit Settings ................................................................................................. 4-27
4-11 Floating-Point Compare Instructions ................................................................ 4-28
4-12 Floating-Point Status and Control Register Instructions................................... 4-29
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MOTOROLA LIST OF TABLES RCPU
xvi Revised 1 February 1999 REFERENCE MANUAL
4-13 Integer Load Instructions .................................................................................. 4-34
4-14 Integer Store Instructions.................................................................................. 4-37
4-15 Integer Load and Store with Byte Reversal Instructions................................... 4-38
4-16 Integer Load and Store Multiple Instructions .................................................... 4-39
4-17 Integer Move String Instructions....................................................................... 4-40
4-18 Floating-Point Load Instructions ....................................................................... 4-42
4-19 Floating-Point Store Instructions....................................................................... 4-45
4-20 Floating-Point Move Instructions ...................................................................... 4-48
4-21 BO Operand Encodings.................................................................................... 4-55
4-22 Branch Instructions........................................................................................... 4-56
4-23 Condition Register Logical Instructions ............................................................ 4-58
4-24 System Linkage Instructions............................................................................. 4-59
4-25 Trap Instructions............................................................................................... 4-60
4-26 TO Operand Bit Encoding................................................................................. 4-60
4-27 Move to/from Machine State Register/Condition Register Instructions ............ 4-61
4-28 Move to/from Special Purpose Register Instructions........................................ 4-62
4-29 User-Level SPR Encodings .............................................................................. 4-62
4-30 Supervisor-Level SPR Encodings..................................................................... 4-63
4-31 Development Support SPR Encodings............................................................. 4-64
4-32 Move from Time Base Instruction...................................................................... 4-65
4-33 User-Level TBR Encodings ............................................................................... 4-65
4-34 Memory Synchronization Instructions............................................................... 4-67
4-35 Instruction Cache Management Instruction ...................................................... 4-68
5-1 Instruction Cache Programming Model ................................................................. 5-3
5-2 ICCST Bit Settings................................................................................................. 5-4
5-3 ICADR Bit Settings ................................................................................................ 5-5
5-4 ICDAT Bit Settings................................................................................................. 5-5
5-5 ICADR Bits Function for the Cache Read Command.......................................... 5-10
5-6 ICDAT Layout During a Tag Read....................................................................... 5-11
6-1 RCPU Exception Classes..................................................................................... 6-2
6-2 Handling of Precise Exceptions............................................................................. 6-4
6-3 Exception Vectors and Conditions........................................................................ 6-6
6-4 Manipulating EE and RI Bits................................................................................ 6-10
6-5 Exception Priorities............................................................................................. 6-11
6-6 Detection Order of Synchronous Exceptions....................................................... 6-13
6-7 Machine State Register Bit Settings ................................................................... 6-15
6-8 Floating-Point Exception Mode Bits.................................................................... 6-16
6-9 MSR Setting Due to Exception ........................................................................... 6-17
6-10 DAR, BAR, and DSISR Values in Exception Processing .................................. 6-18
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RCPU LIST OF TABLES MOTOROLA
REFERENCE MANUAL Revised 1 February 1999 xvii
6-11 Exception Latency ............................................................................................. 6-19
6-12 Settings Caused by Reset ................................................................................ 6-20
6-13 Machine Check Exception Processor Actions ................................................... 6-21
6-14 Register Settings Following a Machine Check Exception................................. 6-22
6-15 Register Settings Following External Interrupt.................................................. 6-23
6-16 Register Settings for Alignment Exception ....................................................... 6-24
6-17 DSISR[15:21] Settings...................................................................................... 6-25
6-18 Register Settings Following Program Exception............................................... 6-28
6-19 Register Settings Following a Floating-Point Unavailable Exception ............... 6-28
6-20 Register Settings Following a Decrementer Exception..................................... 6-29
6-21 Register Settings Following a System Call Exception ...................................... 6-30
6-22 Register Settings Following a Trace Exception ................................................ 6-30
6-23 Register Settings Following a Floating-Point Assist Exception......................... 6-31
6-24 Software/Hardware Partitioning in Operands Treatment................................... 6-33
6-25 FPECR Bit Settings .......................................................................................... 6-35
6-26 FPSCR Bit Settings .......................................................................................... 6-36
6-27 Floating-Point Result Flags in FPSCR.............................................................. 6-38
6-28 Floating-Point Exception Mode Bits.................................................................. 6-41
6-29 Register Settings Following a Software Emulation Exception .......................... 6-47
6-30 Register Settings Following Data Breakpoint Exception................................... 6-48
6-31 Register Settings Following an Instruction Breakpoint Exception..................... 6-48
6-32 Register Settings Following a
Maskable External Breakpoint Exception...................................................... 6-49
6-33 Register Settings Following a
Non-Maskable External Breakpoint Exception.............................................. 6-50
7-1 Load/Store Instructions Timing............................................................................. 7-8
7-2 Encodings of External-to-the-Processor SPRs.................................................... 7-11
7-3 Instruction Execution Timing................................................................................ 7-12
7-4 Control Registers and Serialized Access............................................................. 7-15
8-1 Program Trace Cycle Attribute Encodings............................................................. 8-3
8-2 Fetch Show Cycles Control ................................................................................... 8-4
8-3 VF Pins Instruction Encodings.............................................................................. 8-5
8-4 VF Pins Queue Flush Encodings........................................................................... 8-6
8-5 VFLS Pin Encodings.............................................................................................. 8-6
8-6 Cycle Type Encodings........................................................................................... 8-7
8-7 Detecting the Trace Buffer Starting Point ............................................................ 8-10
8-8 I-bus Watchpoint Programming Options.............................................................. 8-17
8-9 L-Bus Data Events............................................................................................... 8-19
8-10 L-Bus Watchpoints Programming Options......................................................... 8-19
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MOTOROLA LIST OF TABLES RCPU
xviii Revised 1 February 1999 REFERENCE MANUAL
8-11 Trap Enable Data Shifted Into Development Port Shift Register....................... 8-32
8-12 Breakpoint Data Shifted Into Development Port Shift Register ......................... 8-32
8-13 CPU Instructions/Data Shifted into Shift Register.............................................. 8-32
8-14 Status Shifted Out of Shift Register — Non-Debug Mode................................. 8-33
8-15 Status/Data Shifted Out of Shift Register .......................................................... 8-34
8-16 Sequencing Error Activity .................................................................................. 8-35
8-17 Checkstop State and Debug Mode.................................................................... 8-40
8-18 Debug Mode Development Port Usage............................................................. 8-41
8-19 Non-Debug Mode Development Port Usage ..................................................... 8-44
8-20 Prologue Events ................................................................................................ 8-44
8-21 Epilogue Events................................................................................................. 8-45
8-22 Peek Instruction Sequence................................................................................ 8-45
8-23 Poke Instruction Sequence................................................................................ 8-46
8-24 Development Support Programming Model....................................................... 8-48
8-25 Development Support Registers Read Access Protection ................................ 8-49
8-26 Development Support Registers Write Access Protection................................. 8-49
8-27 CMPA-CMPD Bit Settings ................................................................................. 8-50
8-28 CMPE-CMPF Bit Settings.................................................................................. 8-50
8-29 CMPG-CMPH Bit Settings................................................................................. 8-51
8-30 ICTRL Bit Settings ............................................................................................. 8-52
8-31 LCTRL1 Bit Settings .......................................................................................... 8-54
8-32 LCTRL2 Bit Settings .......................................................................................... 8-55
8-33 Breakpoint Counter A Value and Control Register (COUNTA)......................... 8-57
8-34 Breakpoint Counter B Value and Control Register (COUNTB)......................... 8-58
8-35 ECR Bit Settings................................................................................................ 8-59
8-36 DER Bit Settings............................................................................................... 8-61
9-1 Instruction Formats............................................................................................... 9-2
9-2 RTL Notation and Conventions............................................................................. 9-4
9-3 Precedence Rules ................................................................................................ 9-5
9-4 Simplified Mnemonics for addi Instruction ........................................................... 9-10
9-5 Simplified Mnemonics for addic Instruction ......................................................... 9-11
9-6 Simplified Mnemonics for addic. Instruction ........................................................ 9-12
9-7 Simplified Mnemonics for addis Instruction ......................................................... 9-13
9-8 Simplified Mnemonics for
bc, bca, bcl, and bcla Instructions ................................................................. 9-22
9-9 Simplified Mnemonics for
bcctr and bcctrl Instructions........................................................................... 9-26
9-10 Simplified Mnemonics for
bclr and bclrl Instructions ............................................................................................ 9-28
9-11 Simplified Mnemonics for cmp Instruction ......................................................... 9-30
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RCPU LIST OF TABLES MOTOROLA
REFERENCE MANUAL Revised 1 February 1999 xix
9-12 Simplified Mnemonics for cmpi Instruction ........................................................ 9-31
9-13 Simplified Mnemonics for cmpl Instruction ........................................................ 9-32
9-14 Simplified Mnemonics for cmpli Instruction........................................................ 9-33
9-15 Simplified Mnemonics for creqv Instruction ....................................................... 9-37
9-16 Simplified Mnemonics for crnor Instruction........................................................ 9-39
9-17 Simplified Mnemonics for cror Instruction.......................................................... 9-40
9-18 Simplified Mnemonics for crxor Instruction........................................................ 9-42
9-19 Simplified Mnemonics for mfspr Instruction..................................................... 9-114
9-20 TBR Encodings for mftb................................................................................... 9-115
9-21 Simplified Mnemonics for mfspr Instruction..................................................... 9-116
9-22 Simplified Mnemonics for mtcrf Instruction...................................................... 9-117
9-23 Simplified Mnemonics for mtspr Instruction..................................................... 9-124
9-24 Simplified Mnemonics for nor Instruction......................................................... 9-131
9-25 Simplified Mnemonics for or Instruction........................................................... 9-132
9-26 Simplified Mnemonics for ori Instruction.......................................................... 9-134
9-27 Simplified Mnemonics for rlwimi Instruction..................................................... 9-137
9-28 Simplified Mnemonics for rlwinm Instruction.................................................... 9-139
9-29 Simplified Mnemonics for rlwnm Instruction .................................................... 9-140
9-30 Simplified Mnemonics for subf Instruction ....................................................... 9-173
9-31 Simplified Mnemonics for subfc Instruction ..................................................... 9-174
9-32 Simplified Mnemonics for tw Instruction .......................................................... 9-180
9-33 Simplified Mnemonics for twi Instruction.......................................................... 9-181
A-1 Complete Instruction List Sorted by Mnemonic.....................................................A-1
E-1 Condition Register CR Field Bit Symbols..............................................................E-1
E-2 Word Compare Simplified Mnemonics.................................................................E-3
E-3 Word Rotate and Shift Instructions........................................................................E-4
E-4 BO Operand Encodings .......................................................................................E-5
E-5 Simplified Branch Mnemonics..............................................................................E-6
E-6 Operands for Simplified Branch Mnemonics.........................................................E-7
E-7 Simplified Branch Mnemonics with Comparison Conditions ................................E-9
E-8 Operands for Simplified Branch
Mnemonics with Comparison Conditions ........................................................E-9
E-9 Condition Register Logical Mnemonics...............................................................E-12
E-10 Trap Mnemonics Encoding...............................................................................E-13
E-11 Trap Mnemonics...............................................................................................E-14
E-12 TO Operand Bit Encoding .................................................................................E-15
E-13 SPR Simplified Mnemonics..............................................................................E-15
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MOTOROLA LIST OF TABLES RCPU
xx Revised 1 February 1999 REFERENCE MANUAL
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