Motorola DSP56305 Manuel d'utilisateur Page 23
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Noté. / 5. Basé sur avis des utilisateurs
2-8 Optimizing DSP56300/DSP56600 Applications MOTOROLA
Data Operations
Using the barrel shifter
2.4 USING THE BARREL SHIFTER
The DSP56300/DSP56600 includes a true barrel shifter that can be
used for multi-bit data shifts. The instructions that use the barrel
shifter are listed in Table 2-4.
The logical shifts operate on the most significant register (A1/B1) of
the accumulator destination (the accumulator extension and LS
register are not affected). The arithmetic shifts operate on the full
length of the source and destination accumulators, sign extending
when applicable. In addition to the multi-bit shifts, there are also
four respective single bit shift instructions that allow parallel moves
(the multi-bit shifts do not allow them).
The NORMF instruction deserves special attention, as it can
effectively replace several instructions in many common
algorithms. The NORMF instruction arithmetically shifts the data
from the destination accumulator (D) in the direction and amount
specified by the first operand (C). If C > 0, then D is arithmetically
shifted to the left by C bits. If C < 0, then D is arithmetically shifted
to the right by C bits. The operand C should normally be prepared
by the CLB instruction (Count Leading Bits). The instruction pair:
clb a,b
normf b1,a
Table 2-4 Data Operations Using Multi-shift
Mnemonic Function Operands
ASL
Arithmetic
Shift Left
C,S,D
C: number of shift bits
S: source of shift
D: destination
6-bit immediate, or
X0,X1,Y0,Y1,A1,B1
A,B
A,B
ASR
Arithmetic
Shift Right
LSL
Logical
Shift Left
C,D
S: number of shift bits
D: source & destination
5 -bit immediate, or
X0,X1,Y0,Y1,A1,B1
A,B
LSR
Logical
Shift Right
NORMF
Fast
Normalizat
ion
C,D
C: control of shift
D: destination
X0,X1,Y0,Y1,A1,B1
A,B
- 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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