Motorola DSP56305 Manuel d'utilisateur Page 28
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- MARQUE LIVRES
Noté. / 5. Basé sur avis des utilisateurs
Data Operations
Using Less Straight-Forward Instructions
MOTOROLA Optimizing DSP56300/DSP56600 Applications 2-13
The features that help in this case are:
• The ability to specify combinations of signed and unsigned
operands
• The 24-bit right arithmetic shifting inherent in the DMAC
instruction
Using these instruction combinations, and others, enables the
programmer to build other multi-register arithmetic operations. The
user is referred to Appendix A of the
DSP56300
and
DSP56600
Family Manuals
for the full documentation of the various
instruction options.
2.7 USING LESS STRAIGHT-FORWARD
INSTRUCTIONS
The rich instruction set includes many instructions that are in fact
combinations of smaller atomic operations. Among these
instructions are ADDL, ADDR, MAX, EXTRACT, INSERT, MACR,
and MPYR.
A good example of using some of these less straight-forward
instructions is the SQROOT routine. The following is a straight
forward implementation of that routine:
sqroot
;determine 2nd term and add contribution
asr a
sub #$4000,a ;a = L_Temp1
move a1,x0 ;x0 = swTemp
sub #$8000,a ;a = L_Temp1
;determine 3rd term and add contribution
mpy -x0,x0,b ;b = swTemp ^ 2
move b1,x1 ;x1 = swTemp2
asr b
add b,a ;a = L_Temp0
;determine 4th term and add contribution
mpy -x0,x1,b ;b = swTemp x swTemp2
move b1,y0 ;y0 = swTemp3
asr b
add b,a ;a = L_Temp1
;determine partial 5th term
mpyr x0,y0,b
move b,y1 ;y1=swTemp4
- 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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