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15-10
Expressions
Trigger Types
The trigger expression can specify the negative edge, positive edge,
or both edges of a signal to trigger on. To specify the edge to trigger
on, the trigger expression should include the appropriate event-
control statement (see
Table 15-1, Trigger Expressions).
Table 15-1 Trigger Expressions
Trigger Expression Signal Edge
clkt
Trigger on both negative and positive edge.
Verilog:
negedge clkt
VHDL:
clk’event and clk=’0’
Trigger on negative edge.
Verilog:
posedge clkt
VHDL:
clk’event and clk=’1’
Trigger on positive edge.
- VirSim User Guide 1
- VirSim 3
- User Guide 3
- Contents 5
- About this Manual FIX ME! 23
- Licensing 24
- Audience 24
- Platforms 25
- Other Sources of Information 25
- X Resources 26
- SOLV-IT! Online Help 27
- Customer Support 27
- About this Manual 28
- VirSim Overview 1 29
- Operation Modes 30
- Advantages of VirSim 31
- VirSim Overview 32
- Key Terms and Concepts 33
- OSF/Motif™ environment 34
- VirSim Windows 35
- VirSim Navigation 44
- Selecting Signals 46
- Drag-and-drop Operation 47
- Linking Windows 49
- Figure 1-9 Linking Window 50
- Accelerator Keys 51
- Operation Accelerator 52
- HB WW SW LB RW IW 52
- Starting VirSim 1 55
- Starting VirSim 56
- +cfgfile+<filename> 57
- +vslogfile+<filename> 57
- <signal>) 57
- +cfgfile+default.cfg 60
- VHDL Command Line Syntax 62
- Figure 2-2 Command Line 66
- Opening the Open File Dialog 71
- Figure 2-3 Open File Dialog 72
- Open Files 72
- Opening a Single History File 76
- Closing History Files 77
- Reopening History Files 79
- Saving a Configuration File 81
- Loading a Configuration File 82
- Configuration File Format 83
- Nested Configuration Files 84
- Loading Sources 85
- Hierarchy Browser 1 89
- Selecting a Design 91
- Choosing View Options 92
- Hierarchy Browse 93
- Navigating the Hierarchy 94
- Adding Signals to a Group 97
- Hierarchy Browser 100
- Menu Bar 101
- File Menu 101
- Edit Menu 102
- Display Menu 102
- View Menu 103
- Waveform Window 1 105
- Waveform Window 106
- Signal Value Pane 108
- Waveform Pane 110
- Cursor Pane 111
- Status Bar 112
- Selecting and Viewing Signals 113
- Adding and Reordering Signals 113
- User Defined Buses 117
- Zooming Waveforms 118
- Note: 121
- Delta Cycles 123
- Expand and Collapse Times 124
- View Delta Cycles 125
- Advanced Features 127
- Expressions 128
- Creating Breakpoint Groups 128
- Changing the Display Format 133
- Selecting Drawing Mode 134
- Modifying Waveform Height 135
- Additional Features 140
- Printing Waveforms 142
- Printing a Time Range 143
- Specifying a Printer Name 145
- Printing to Postscript 145
- Toolbar and Menu Reference 147
- Context Sensitive Menus 150
- Zoom Menu 156
- Source Window 1 159
- Execution Pane 161
- Source Text Pane 162
- Control Pane 163
- Table 5-2 Control Pane 164
- Source Window 165
- Navigate and View a Design 166
- Edit the Correct Design File 167
- Follow Source Execution 169
- Control Source Execution 169
- Using Breakpoints 169
- Set Breakpoints 169
- Clear Breakpoints 170
- Run to Breakpoints 170
- Using Instance Groups 171
- Define Markers 174
- Capture Line Data 175
- Descend Instance 179
- Go to Parent 179
- Logic Browser 1 185
- Introducing the Logic Browser 186
- Getting Started 188
- Viewing Graphic Objects 189
- Logic Browser 190
- Logic Browse 191
- Navigating a Design 194
- Using Event Origin 198
- Using the Connection Dialog 198
- Expressions Example 201
- Changing the Display 203
- Toolbar and Menu Reference 205
- Next Selected 206
- Signals Change 206
- Logic Browser CSM 207
- Prev/Next Change 208
- Load View NL 208
- Edit At Definition 208
- Module Instance CSM 209
- Port Instance CSM 210
- Event Origin 211
- Load Value 211
- View Connection 211
- Selected Net CSM 212
- Register Window 1 217
- What is a View? 218
- Which Signals are Loaded? 219
- Edit Views 220
- Undo Command 221
- Display Unique Events 222
- Set Time Scale 222
- Align Objects 223
- Distribute Objects 223
- Register Window 226
- Signal Properties CSM 228
- Select All 230
- Graphics Menu 234
- Interactive Window 1 237
- History Pane 238
- Command Prompt 238
- User-Defined Buttons 239
- Simulator Controls 239
- Step Control 239
- Scope Control 240
- Time Display 240
- Window Status 241
- Interactive Window 242
- Simulation 243
- Controlling the Simulator 245
- Breakpoint Durations 246
- Expression Breakpoints 247
- Line Breakpoints 250
- Default Buttons Files 252
- Creating User-Defined Buttons 253
- Defining a Button 254
- Selection Substitution 255
- File Commands 257
- Edit Commands 257
- Sim Commands 258
- Project Window 1 261
- Project Window 262
- What is a Workspace? 263
- What is a Project? 264
- What is a Design Top? 264
- Workspace Pane 265
- View Pane 269
- Project Folder View 270
- Design Top Folder View 271
- Source File Folder View 272
- Dependency Folder View 274
- Library Folder View 275
- New VHDL Library 277
- New Verilog Library Work 277
- New Verilog Library Other 277
- Library View 278
- Add Top 279
- Edit Source 279
- View Full Detail 279
- Tear Off Windows 280
- Output Pane 280
- Project Menu 285
- Tools Menu 287
- Windows Menu 288
- New Workspace Dialog 289
- Open File Dialog 291
- Add Files Dialog 293
- Select a Directory Dialog 295
- Edit Setup Constants Dialog 296
- New Verilog Library Dialog 298
- Library Name 298
- Path Name 298
- Using the Options Dialog 299
- Options Dialog Buttons 300
- Setting Analyze Options 301
- Setting Elaborate Options 302
- Setting Simulate Options 304
- Setting Verilog Run Options 306
- Commands 308
- Files and Directories 314
- Moving Projects 315
- Using a Makefile 316
- Time Units 1 317
- Display Unit 318
- Time Units 319
- Radices 1 321
- Radix Dialog 323
- Radix Editor 324
- Mapping List Editor 325
- Creating a User-Defined Radix 326
- Event Origin 1 327
- Before Using Event Origin 328
- How to Use Event Origin 329
- Display the Event Origin 331
- Debug with Event Origin 334
- Building Buses 1 337
- Building Buses 338
- Bus Builder Dialog 339
- Markers 1 345
- Marker knownOk set 346
- Markers Dialog 347
- Opening the Marker Dialog 349
- Creating a Marker 349
- Deleting a Marker 349
- Editing a Marker 350
- Setting a Marker 350
- Expressions 1 353
- Expressions Dialog 354
- Entering Signal Names 358
- Creating Expressions 359
- Updating Expressions 360
- Displaying Expressions 361
- Trigger Types 362
- Searching with Expressions 363
- Level Sensitive Searches 364
- Edge-triggered Searches 365
- VirSim Setup 1 367
- Caution: Before You Start 368
- VirSim Platforms 368
- Common Settings 370
- Mouse Button Setting 371
- VirSim Setup 372
- Waveform Window Settings 374
- Source Window Settings 376
- Hierarchy Window Settings 377
- Logic Browser Settings 378
- Register Window Settings 379
- Interactive Window Settings 380
- Settings for X Resources 381
- X Color System 382
- Switching Color Maps 383
- VCD+ (vpd) File Generation 1 385
- Advantages of VCD+ 386
- System Tasks and Functions 387
- $vcdpluson; 388
- $vcdplusoff 389
- $vcdplusautoflushon 390
- $vcdplusautoflushoff 390
- VCD+ (vpd) File Generation 391
- Syntax for Specifying MDAs 392
- Examples 394
- Note: Unlimited dimensions 395
- Starting bound: 396
- Ending bound: 396
- mem01[2][5][8] 400
- Selected element: 400
- $vcdplusmemorydump Task 401
- Execution Data 401
- Execution 402
- Source Statement System Tasks 403
- $vcdplustraceon 403
- Simulator Run-Time Options 408
- VCD+ Methodology 411
- C1> sigon_instreg; 414
- VCD+ On/Off PLI Rules 415
- Performance Tips 416
- Translating VCD and VCD+ 1 419
- <vpd_file> 420
- EVCD Options 421
- Translating VCD and VCD+ 422
- VCD file in ASCII format 423
- VHDL Mapping 424
- Viewing OpenVera Assertions 1 427
- Viewing OpenVera Assertions 428
- How Sequences Are Tested 429
- Viewing OVA Results in VirSim 431
- Waveform Defaults 2 435
- Waveform Defaults 436
- Waveform Style: VHDL Defaults 438
- Chapter 16 439
- Table A-2 VHDL Defaults 439
- Waveform Style: EPIC Defaults 440
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