Motorola DSP56305 Manuel d'utilisateur Page 75
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- Table des matières
- MARQUE LIVRES
Noté. / 5. Basé sur avis des utilisateurs
6-2 Optimizing DSP56300/DSP56600 Applications MOTOROLA
Pipeline Interlocks
Data ALU Pipeline Interlocks
6.1.1 What are the Data ALU Pipeline Interlocks?
There are three types of Data ALU pipeline interlocks:
• Arithmetic Interlock—An arithmetic interlock causes a
single cycle delay in the execution of the MOVE instruction.
It is caused by moving the contents of (or one part of) an
accumulator that was the destination in the preceding
arithmetic instruction.
Example:
mpy X0,Y0,A ;Arithmetic Instruction. A is
;destination
move A,X:(R0)+ ;Move the contents of A to
;memory
Note: The following code sequence does not generate an arithmetic
pipeline interlock:
mpy X0,Y0,A ;Arithmetic Instruction. A is
;destination
mac X1,Y1,A ;Add A contents from previous
;instruction with X1
× Y1
• Transfer Interlock—A transfer interlock causes a single cycle
delay in the execution of the second MOVE instruction (the
one that reads the accumulator or one of its parts). It is
caused by moving the contents of an (or parts of)
accumulator that was the destination of the preceding or
second preceding MOVE instruction.
Example:
move X:(R0)+,A ;Move memory to A
move A1,Y0 ;Move A1 to register
• Status Interlock—A status interlock causes a double or
single cycle delay in the execution of the MOVE instruction
that reads SR. It is caused by a MOVE instruction that reads
the contents of the Status Register (SR) immediately or two
instructions after an arithmetic instruction.
Example:
mac X1,Y1,B ;Arithmetic Instruction
move SR,X:(R0)+ ;Read SR by a MOVE instruction
Out of these three pipeline interlocks, only the Arithmetic Interlock
may occur more often in a typical application. Transfer Interlock
- 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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