Motorola DSP56305 User Manual Page 3
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iv Optimizing DSP56300/DSP56600 Applications MOTOROLA
SECTION 4 USING THE DMA . . . . . . . . . . . . . . .4-1
4.1 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . .4-1
4.2 CONSERVING CORE MIPS BY WORKING IN
PARALLEL. . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1
4.3 USING SLOW, LOW-COST MEMORIES . . . .4-4
4.4 SERVICING A PERIPHERAL . . . . . . . . . . . . .4-6
4.5 DATA TRANSFER OPTIMIZATION HINTS. .4-12
SECTION 5 INSTRUCTION CACHE AND
MEMORY FEATURES . . . . . . . . . . .5-1
5.1 THE INSTRUCTION CACHE. . . . . . . . . . . . . .5-1
5.1.1 Cache Sectors. . . . . . . . . . . . . . . . . . . . . . .5-3
5.1.2 Control of Sector Allocation. . . . . . . . . . . . .5-4
5.1.3 Cache Burst Mode. . . . . . . . . . . . . . . . . . . .5-6
5.2 MEMORY SWITCH . . . . . . . . . . . . . . . . . . . . .5-9
5.3 USING THE BOOTSTRAP ROM. . . . . . . . . .5-11
SECTION 6 PIPELINE INTERLOCKS . . . . . . . . .6-1
6.1 DATA ALU PIPELINE INTERLOCKS . . . . . . .6-1
6.1.1 What are the Data ALU Pipeline
Interlocks?. . . . . . . . . . . . . . . . . . . . . . . . . .6-2
6.1.2 Avoiding Data ALU Pipeline Interlocks . . . .6-3
6.1.2.1 Code Reorder . . . . . . . . . . . . . . . . . . . . .6-3
6.1.2.2 Loop Unrolling. . . . . . . . . . . . . . . . . . . . .6-4
6.1.2.2.1 Loop Unrolling in N Array Scale
Routine. . . . . . . . . . . . . . . . . . . . . . . .6-4
6.1.2.2.2 Unrolling in Memory Array Copy
Routine. . . . . . . . . . . . . . . . . . . . . . . .6-5
6.1.2.3 Saving Interlocks by Using the TFR
Instruction. . . . . . . . . . . . . . . . . . . . . . . .6-6
6.2 ADDRESS GENERATION PIPELINE
INTERLOCKS . . . . . . . . . . . . . . . . . . . . . . . . .6-7
6.2.1 What are the Address Generation Pipeline
Interlocks. . . . . . . . . . . . . . . . . . . . . . . . . . .6-7
6.2.2 Avoiding Address Generation Pipeline
Interlocks. . . . . . . . . . . . . . . . . . . . . . . . . . .6-8
- DSP56300/DSP56600 1
- Digital Signal 1
- Processors 1
- TABLE OF CONTENTS 2
- LIST OF FIGURES 6
- LIST OF TABLES 7
- INTRODUCTION 8
- 1.2 DSP56600 CORE FAMILY 9
- Table 1-1 11
- Introduction 12
- Description and Use 13
- Application Note Structure 14
- 1.4.3 Appendixes 15
- DATA OPERATIONS 16
- DSP56300 Family Manual 21
- 2.3 THE MAX INSTRUCTION 22
- 2.4 USING THE BARREL SHIFTER 23
- Data Operations 24
- Using the barrel shifter 24
- DSP56300 26
- DSP56600 Family 26
- Double precision arithmetic 27
- INSTRUCTIONS 28
- PROGRAM CONTROL 30
- Program Control 31
- Hardware Loops 31
- 3.2 THE HARDWARE STACK 32
- DSP56600 Family Manuals 35
- 3.3 USING THE STACK EXTENSION 36
- Using the Stack Extension 37
- EXTENSION 39
- Conditional DALU Instructions 40
- 3.6 PC RELATIVE INSTRUCTIONS 42
- DSP56600 Family Manual 43
- 3.7 USING FAST INTERRUPTS 46
- Using Fast Interrupts 48
- USING THE DMA 50
- Using the DMA 51
- Using Slow, Low-Cost Memories 54
- 4.4 SERVICING A PERIPHERAL 55
- Servicing a Peripheral 56
- Section 5 62
- 5.1 THE INSTRUCTION CACHE 62
- 5.1.1 Cache Sectors 64
- The Instruction Cache 65
- 5.1.3 Cache Burst Mode 67
- 5.2 MEMORY SWITCH 70
- Memory Switch 71
- 5.3 USING THE BOOTSTRAP ROM 72
- Using the Bootstrap ROM 73
- PIPELINE INTERLOCKS 74
- Pipeline Interlocks 75
- Data ALU Pipeline Interlocks 75
- DSP56000 Family Manual 76
- INTERLOCKS 80
- Interlocks 80
- 6.3 STACK EXTENSION DELAYS 81
- Interlocks? 83
- COMPACT OPCODE USE 86
- Instructions 87
- Compact Opcode Use 89
- Cycle Count of an Instruction 89
- 7.2 ADDRESSING MODES 90
- 7.2.2 Short Addressing Mode 91
- 7.2.3 Short Immediate Mode 91
- 7.2.5 Register Addressing 92
- 7.2.6 Word Count 92
- 7.3 PERIPHERAL ADDRESSING 92
- 7.4 SPECIAL INSTRUCTIONS 93
- 7.4.1 Dual Data Spaces 93
- 7.4.3 Clearing Registers 94
- Special Instructions 95
- SAVING POWER 96
- A.1.2 Stop Standby Mode 97
- A.1.3 Low-Power Clock Divider 97
- Saving Power 98
- Disabling Functional Blocks 98
- DEBUG AND TEST SUPPORT 100
- B.2 JTAG PORT FEATURES 101
- B.3 ADDRESS TRACING 102
- Debug and Test Support 103
- Address Tracing 103
- USING THE PROFILER 104
- C.3 THE PROFILING REPORT 105
- C.3.1 Basic Report 105
- C.3.2 Symbol Report 106
- Using the Profiler 107
- C.3.4 Code Coverage Report 108
- C.3.5 Basic Subroutine Report 109
- C.3.8 Subroutine Call Report 111
- C.4 USING THE PROFILE REPORT 111
- How to reach us: 112
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