Motorola DSP56305 Manuel d'utilisateur Page 16
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Noté. / 5. Basé sur avis des utilisateurs
MOTOROLA Optimizing DSP56300/DSP56600 Applications 2-1
This section
discusses
important features
and new additions
to the DSP56000
core Data
Arithmetic Unit
Section 2
DATA OPERATIONS
2.1 USING THE DUAL DATA PATHS
The DSP56300/DSP56600 core can execute a new instruction every
clock cycle. This performance can be used efficiently only if data can
be fed to the core and its results moved out of it at a sufficient rate.
The DSP56300/DSP56600 core’s highly parallel architecture was
designed to allow performing the following operations in parallel:
• Data ALU instruction execution
• Up to two parallel moves of data operands or results to/from
the Data ALU
• Up to two address calculations for the next instruction
• Fetch of next instruction
The two data paths (the X bus and Y bus) connect two data memory
sections (the X memory and the Y memory) with the Data ALU.
This parallelism allows the DSP56300/DSP56600 core to execute
more effectively, for example, executing a FIR tap in one clock cycle:
Data that is moved in parallel
into
a register is ready for use in the
next instruction, and does not interfere with the current value of the
operands in execution. In the above example, the values of X0 and
Y0 are updated only after the “MAC” instruction uses its operands.
Similarly, data moved
from
a register will hold the data before it was
updated as a result of execution. For example:
mac x0,y0,a a,x:(r0)+
The value of the accumulator A that is moved to the memory is the
value before its update by the “MAC” instruction.
Opcode + operands
Data for next
iteration via the X
data bus +
increment pointer
Data for next
iteration via the Y
data bus +
increment pointer
____________________________________________ ___________________________________ ____________________________________
mac x0,y0,a x:(r0)+,x0 y:(r4)+,y0
- 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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