Motorola DSP56305 Manuel d'utilisateur Page 98
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- MARQUE LIVRES
Noté. / 5. Basé sur avis des utilisateurs
Saving Power
Disabling Functional Blocks
MOTOROLA Optimizing DSP56300/DSP56600 Applications A-3
A.2 DISABLING FUNCTIONAL BLOCKS
The are few functional blocks that can be disabled during normal
operation if they are not required by the application. A special
control bit exist for each block that should be used to disable it and
by that reduce the total power consumption. The following
functions can be disabled:
• CLKOUT—If the user does not need this pin for external
devices, it can be shut off by setting the COD (Clock Out
Disable) bit in the PLL Control Register—Bit 19 in the PCTL
[X:$FFFFFD] register in the DSP56300 and Bit 7 in the PCTL1
[X:$FFFEC] register in the DSP56600.
• Instruction Cache—When the instruction cache is not
required to operate in the application, the instruction cache
controller should be disabled by clearing the CE (Cache
Enable) bit in the Status Register (SR)—Bit 19 (DSP56300
only).
• Direct Memory Access (DMA) Controller—Each DMA
channel has a special DMA Enable bit (DE) in its control
register. When all these bits are cleared, the DMA controller
is disabled and will not consume any power supply current
(DSP56300 only).
• External Bus—When the application does not require access
to external devices (I/O or Memories) through the External
Bus (Port A), then the External Bus Disable (EBD) bit should
be set—Bit 4 of the Operating Mode Register (OMR) in both
the DSP56300 and DSP56600.
• PC Relative—When the application does not use the PC
Relative subset of the instruction set, than the PCD (PC
Relative Disable) bit should be set—Bit 5 of the Operating
Mode Register (OMR) in the DSP56600. (DSP56600 only)
• Address Tracing—When the user is not debugging his
application and tracing of internal activity over the external
address bus is not required, it is advisable to turn off the
Address Tracing (AT) mode bit to reduce current drain.
- 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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