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Chapter 8 AutoCode Sim Cdelay Scheduler
© National Instruments Corporation 8-17 AutoCode Reference
that repeated until no new tasks where queued for execution. Given such an
implementation, the chained ANC problem would disappear. However,
under such a design, scheduler execution time would be variable and data
dependent—undesirable attributes in any hard real-time scheduler.
Contrast this with the new scheduler, which catches the first element of an
ANC chain but has a fixed-length pipeline. An evaluation of the trade-offs
between the relaxation approach and the fixed pipeline approach must be
done before such potentially dangerous changes are made to any scheduler.
- NI MATRIXx 1
- Important Information 3
- Conventions 4
- Chapter 3 6
- Ada Language Reference 6
- Chapter 4 8
- Chapter 5 8
- Contents 10
- AutoCode Reference x ni.com 10
- Chapter 6 11
- Vectorized Code Generation 11
- AutoCode Reference xii ni.com 12
- Appendix A 13
- Introduction 14
- General Information 15
- Configuration File 15
- Language-Specific Information 15
- Using MATRIXx Help 16
- Related Publications 17
- C Language Reference 18
- Stand-Alone Library 19
- AutoCode Reference 2-4 ni.com 21
- Target-Specific Utilities 22
- AutoCode Reference 2-6 ni.com 23
- AutoCode Reference 2-8 ni.com 25
- UserCode Blocks 27
- Implementing Handwritten UCBs 30
- File Name: usr_dsp.c 32
- Fleming: usr_dsp.c 34
- Function Name: usr_dsp 34
- Variable Interface UCB 35
- Interface Ordering 35
- Function Prototype 36
- Procedure SuperBlocks 37
- Generate Reusable Procedure 40
- Function 41
- C Fixed-Point Arithmetic 43
- Fixed-Point Data Types 45
- User Types 47
- Overflow Protection 48
- Stand-Alone Files 48
- Macro Interface 49
- Function Interface 50
- Conversion Macros 52
- 8-bit number with a shift of 53
- i ALIGN so wo p (n, rp) 54
- Arithmetic Macros 55
- 32-Bit Multiplication 59
- 32-Bit Division 60
- 16-Bit by 8-Bit Division 60
- 32-Bit by 16-Bit Division 60
- Fixed-Point Relational Macros 61
- Some Relevant Issues 62
- Supplied Templates 64
- (or sa_utils.ada), the 66
- Data Types 67
- Error Procedure( ) Procedure 69
- AutoCode Reference 3-8 ni.com 70
- External_Input ( ) Procedure 72
- Calling UCBs 74
- Ada Fixed-Point Arithmetic 78
- Generic Functions 79
- Instantiated Functions 79
- Package Dependencies 80
- Compilation Example 83
- Fixed-Point Type Declarations 85
- Bit-Wise Functions 88
- Operator Instantiations 88
- Sample Package 90
- Conversion Functions 93
- Language-Defined Conversion 94
- Truncation Conversion 94
- Explicit Rounding Conversion 94
- Known Ada Compiler Problems 97
- No-Op Conversion Function 98
- Operating Systems 100
- Configuration Items 101
- Table Syntax 101
- Scheduler Priority Table 103
- Subsystem Table 103
- AutoCode Reference 4-6 ni.com 105
- Processor IP Name Table 106
- Version Table 107
- Using the Configuration File 107
- Generated Code Architecture 109
- Signal Naming 110
- Duplicate Names 110
- Selection of a Signal Name 110
- Global Storage 111
- -vbco option is not used 112
- Subsystems 113
- Top-Level SuperBlock 114
- Block Ordering 114
- Interface Layers 114
- Sys_ExtIn and Sys_ExtOut, to 115
- Single-Rate System 116
- Multi-Rate System 116
- Sample and Hold 116
- Static Data Within Subsystems 117
- R_P and I_P 117
- State Data 117
- Procedure Data 118
- Pre-init Phase 118
- Copy Back and Duplicates 118
- Standard Procedures 119
- Unrolled Interface 120
- Phases and Error Handling 120
- Referenced Percent Variables 120
- Procedure Arguments 123
- U, Y, S, and I 123
- Caller Identification 126
- Compatibility Issues 127
- Macro Procedure 128
- Asynchronous Procedures 129
- Condition Block 130
- BlockScript Block 130
- Inputs and Outputs 131
- Environment Variables 132
- Local Variables 132
- Default Phase 134
- Local Variables and Phases 135
- Discrete Semantics 135
- Continuous Semantics 137
- Looping Concepts 137
- Terminology 137
- Loops and Scalar Code 137
- Vectorized Code 139
- Types of Loops 139
- Parameters 141
- Optimizations 143
- Dead Code Elimination 143
- Implicit Type Conversion 144
- Special Directives 144
- UserCode Block 145
- Parameterized UCB Callout 146
- Software Constructs 147
- BREAK Block 148
- CONTINUE Block 148
- Local Variable Block 148
- Continuous Subsystem 149
- Explicit Phases 150
- Integrator 150
- Limitations 150
- Shared Memory Architecture 151
- Shared Memory Callouts 152
- Callout Naming Convention 152
- Mapping Command Options 153
- Definitions and Conventions 153
- From Local Memory 154
- From Shared Memory 154
- option is not used 155
- @offset = offset plus 1@@ 156
- ) data types 158
- Callout Pairs 159
- syntax to call 160
- options 161
- Scalar Gain Block Example 165
- Vectorized Gain Block Example 166
- Array Subscripts 167
- Signal Connectivity 168
- Block Outputs 168
- Block Inputs 168
- AutoCode Reference 6-6 ni.com 169
- Vectorization Modes 170
- Vector Labels and Names 171
- Vectorization Features 177
- Split-Merge Inefficiency 180
- Split Vector 180
- External Outputs 184
- Copy-Back 184
- Eliminating Copy-Back 186
- Other Copy-Back Scenarios 186
- Matrix Outputs 191
- Code Optimization 192
- Chapter 7 Code Optimization 193
- AutoCode Reference 7-2 ni.com 193
- AutoCode Reference 7-4 ni.com 195
- Restart Capability 196
- AutoCode Reference 7-6 ni.com 197
- Merging INIT Sections 199
- -Oreuse 1 202
- Constant Propagation 204
- Optimizing with Matrix Blocks 207
- AutoCode Sim Cdelay Scheduler 211
- Task Posting Policies 212
- Standard AutoCode Scheduler 213
- AutoCode Reference 8-4 ni.com 214
- Scheduler Pipeline 215
- AutoCode Reference 8-6 ni.com 216
- AutoCode Reference 8-8 ni.com 218
- Sim Cdelay Scheduler 219
- Implementation Details 222
- DataStore Priority Problem 223
- Global Scope Signals and 228
- Parameterless Procedures 228
- Data Monitoring/Injection 229
- AutoCode Reference 9-4 ni.com 231
- Parameterless Procedure 232
- Output Specification 233
- Global Output Connection 233
- Issues and Limitations 235
- SystemBuild Simulator 235
- Connection to External Output 236
- Recommendations 236
- Naming Convention 236
- Model Documentation 236
- Explicit Sequencing 236
- Command Options 237
- Technical Support and 238
- Professional Services 238
- AutoCode Reference I-2 ni.com 240
- AutoCode Reference I-4 ni.com 242
- AutoCode Reference I-6 ni.com 244
- AutoCode Reference I-8 ni.com 246
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