Motorola DSP56305 User Manual Page 78
- Page / 112
- Table of contents
- BOOKMARKS
Rated. / 5. Based on customer reviews
Pipeline Interlocks
Data ALU Pipeline Interlocks
MOTOROLA Optimizing DSP56300/DSP56600 Applications 6-5
The read operations in the tenth and eleventh instructions will not
cause arithmetic pipeline interlocks to happen. Although the loop
contains double the words of the original code, it is executed half
the time, resulting in 2N cycles performance as desired.
6.1.2.2.2 Unrolling in Memory Array Copy routine
The following code segment is used to copy data array (of N words)
from x-space memory to y-space memory:
move #X-start,r0 ;starting address of source
;array in x-memory
move #Y-start,r4 ;starting address of
;destination array in y-memory
DO #N,_end
move x:(r0)+,x0 ;read source array
move x0,y:(r4)+ ;write destination memory
_end
The main loop in the above code will be executed in 2N cycles. The
first stage towards optimization of this task would be to unroll the
loop while using double parallel moves:
move #X-start,r0 ;starting address of source
;array in x-memory
move #Y-start,r4 ;starting address of
;destination array in y-memory
move x:(r0)+,a ;read first word from source
;memory
DO #(N/2-1),_end
move x:(r0)+,aa,y:(r4)+ ;read source array, write
;previous data
move x:(r0)+,aa,y:(r4)+ ;write destination memory,
;read next data
_end
move a,y:(r4)+ ;write last word to destination
;memory
Please note that a transfer pipeline interlock is introduced in this
optimized code, causing the main loop to execute in 1.5N – 1 cycles.
The next step in optimizing the task would be to use both A and B to
avoid the transfer pipeline interlock. Using the following
modification, the main loop will execute in N – 1 cycles.
move #X-start,r0 ;starting address of source
;array in x-memory
move #Y-start,r4 ;starting address of
;destination array in y-memory
move x:(r0)+,a ;read first word from source
;memory
move x:(r0)+,b ;read second word from source
;memory
DO #(N/2-1),_end
move x:(r0)+,aa,y:(r4)+ ;read source array, write
- 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
Related products and manuals for Processors Motorola DSP56305
Processors Motorola MC68306 User Manual
(93 pages)
(93 pages)
Processors Motorola MC68302 User Manual
(6 pages)
(6 pages)
Processors Motorola CPU32 User Manual
(646 pages)
(646 pages)
Processors Motorola MVME712-12 Service Manual
(210 pages)
(210 pages)
Processors Motorola MC68302 User Manual
(6 pages)
(6 pages)
Processors Motorola DSP56305 User Manual
(47 pages)
(47 pages)
Processors Motorola MC68328 User Manual
(198 pages)
(198 pages)
Processors Motorola MC68328 User Manual
(6 pages)
(6 pages)
Processors Motorola MC68306 User Manual
(8 pages)
(8 pages)
Processors Motorola MC68340 User Manual
(57 pages)
(57 pages)
Processors Motorola MC68306 User's Guide
(89 pages)
(89 pages)
Processors Motorola DSP56800 Specifications
(28 pages)
(28 pages)
Processors Motorola CPU32 User's Guide
(205 pages)
(205 pages)
Processors Motorola DSP56303 User Manual
(4 pages)
(4 pages)
Processors Motorola DSP56000 User Manual
(354 pages)
(354 pages)
© 2020, manymanuals.com. All rights reserved. | 1.383 s |
Manymanuals.com
Manymanuals.de
Manymanuals.fr
Manymanuals.it
Manymanuals.pl
Manymanuals.cz
Manymanuals.es
Manymanuals-pt.com
Comments to this Manuals