SystemVerilog用户指南2009.06版

systemverilog
user
guide
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"SystemVerilog用户指南(2009.06版)" 是一份由Synopsys公司在2009年发布的关于SystemVerilog语言的详细使用指南。 SystemVerilog是一种高级的硬件描述语言（HDL），广泛应用于集成电路设计、验证和系统级建模。在2009.06版本的用户指南中，读者可以期待找到关于以下几个核心知识点的详尽介绍： 1. **语法基础**：SystemVerilog的语法结构包括数据类型（如int, reg, logic等）、运算符、控制结构（如if-else, case, for循环等）以及过程（如always块）等基础内容。 2. **类和对象**：SystemVerilog引入了面向对象编程的概念，允许创建类、对象，实现继承、封装和多态性，这对于构建复杂的验证环境非常有用。 3. **接口和包**：接口用于定义模块间的通信协议，而包则用于组织和重用代码，两者都是SystemVerilog中的重要组成部分。 4. **高级验证方法**：包括随机化（rand和constraint）、覆盖（coverpoint和covergroup）以及断言（assertion）等，这些都是SystemVerilog提供的强大验证工具。 5. **并行与并发**：SystemVerilog支持基于时间划分的并行执行模型，如fork-join语句，以及基于事件驱动的并发机制。 6. **内存模型**：包括寄存器数组（reg array）、分布式RAM和块RAM的表示方法，以及如何进行读写操作。 7. **多线程和任务**：SystemVerilog的任务和函数可以并发执行，这使得设计者能够创建复杂的并发行为模型。 8. **接口和连接**：SystemVerilog提供了一种灵活的接口连接机制，使得模块间接口的连接变得更加方便。 9. **约束与随机化**：利用随机化和约束，可以生成各种可能的输入组合，从而增强测试覆盖率。 10. **系统级建模**：SystemVerilog支持组件级和行为级的系统级建模，使得在早期设计阶段就能进行功能验证。 11. **IP-XACT集成**：SystemVerilog与IP-XACT标准的结合，促进了IP模块的复用和标准化。 12. **模拟和仿真**：指南中会涵盖如何使用SystemVerilog进行模拟和仿真的基本步骤和技巧。 13. **错误处理和调试**：包括断点、观察点、跟踪等功能，帮助开发者定位和修复设计问题。 这份2009.06版的SystemVerilog用户指南，不仅提供了语言规范的详细解释，还包含了大量实例和最佳实践，对于学习和掌握SystemVerilog的使用者来说是一份宝贵的参考资料。尽管文档的版权属于Synopsys公司，但根据许可协议，内部使用时可合法复制，每份副本都应包含相应的版权和专有信息声明。

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SystemVerilog Reference Manual 3.1a（中英文版）+最新SV IEEE 标准

2019-01-07 上传
Table of Contents Section 1 Introduction to SystemVerilog ...................................................................................................... 1 Section 2 Literal Values.................................................................................................................................. 4 2.1 Introduction (informative) ...............................................................................................................4 2.2 Literal value syntax..........................................................................................................................4 2.3 Integer and logic literals ..................................................................................................................4 2.4 Real literals ......................................................................................................................................5 2.5 Time literals .....................................................................................................................................5 2.6 String literals....................................................................................................................................5 2.7 Array literals ....................................................................................................................................6 2.8 Structure literals ...............................................................................................................................6 Section 3 Data Types....................................................................................................................................... 8 3.1 Introduction (informative) ...............................................................................................................8 3.2 Data type syntax...............................................................................................................................9 3.3 Integer data types ...........................................................................................................................10 3.4 Real and shortreal data types .........................................................................................................11 3.5 Void data type ................................................................................................................................11 3.6 chandle data type ...........................................................................................................................11 3.7 String data type ..............................................................................................................................12 3.8 Event data type...............................................................................................................................16 3.9 User-defined types .........................................................................................................................16 3.10 Enumerations .................................................................................................................................17 3.11 Structures and unions.....................................................................................................................22 3.12 Class...............................................................................................................................................26 3.13 Singular and aggregate types .........................................................................................................27 3.14 Casting ...........................................................................................................................................27 3.15 $cast dynamic casting ....................................................................................................................28 3.16 Bit-stream casting ..........................................................................................................................29 Section 4 Arrays ............................................................................................................................................ 32 4.1 Introduction (informative) .............................................................................................................32 4.2 Packed and unpacked arrays ..........................................................................................................32 4.3 Multiple dimensions ......................................................................................................................33 4.4 Indexing and slicing of arrays........................................................................................................34 4.5 Array querying functions ...............................................................................................................35 4.6 Dynamic arrays ..............................................................................................................................35 4.7 Array assignment ...........................................................................................................................37 4.8 Arrays as arguments.......................................................................................................................38 4.9 Associative arrays ..........................................................................................................................39 4.10 Associative array methods .............................................................................................................41 4.11 Associative array assignment.........................................................................................................44 4.12 Associative array arguments ..........................................................................................................44 4.13 Associative array literals................................................................................................................44 4.14 Queues ...........................................................................................................................................45 4.15 Array manipulation methods .........................................................................................................47 Section 5 Data Declarations ......................................................................................................................... 52 5.1 Introduction (informative) .............................................................................................................52 5.2 Data declaration syntax..................................................................................................................52 5.3 Constants........................................................................................................................................52 Accellera SystemVerilog 3.1a Extensions to Verilog-2001 viii Copyright 2004 Accellera. All rights reserved . 5.4 Variables ........................................................................................................................................53 5.5 Scope and lifetime .........................................................................................................................54 5.6 Nets, regs, and logic.......................................................................................................................55 5.7 Signal aliasing................................................................................................................................56 5.8 Type compatibility .........................................................................................................................58 Section 6 Attributes....................................................................................................................................... 61 6.1 Introduction (informative) .............................................................................................................61 6.2 Default attribute type .....................................................................................................................61 Section 7 Operators and Expressions.......................................................................................................... 62 7.1 Introduction (informative) .............................................................................................................62 7.2 Operator syntax..............................................................................................................................62 7.3 Assignment operators ....................................................................................................................62 7.4 Operations on logic and bit types ..................................................................................................63 7.5 Wild equality and wild inequality..................................................................................................63 7.6 Real operators ................................................................................................................................64 7.7 Size.................................................................................................................................................64 7.8 Sign ................................................................................................................................................64 7.9 Operator precedence and associativity ..........................................................................................64 7.10 Built-in methods ............................................................................................................................65 7.11 Static Prefixes ................................................................................................................................66 7.12 Concatenation ................................................................................................................................67 7.13 Unpacked array expressions ..........................................................................................................67 7.14 Structure expressions .....................................................................................................................68 7.15 Tagged union expressions and member access..............................................................................70 7.16 Aggregate expressions ...................................................................................................................71 7.17 Operator overloading .....................................................................................................................72 7.18 Streaming operators (pack / unpack) .............................................................................................73 7.19 Conditional operator ......................................................................................................................77 7.20 Set membership..............................................................................................................................77 Section 8 Procedural Statements and Control Flow.................................................................................. 79 8.1 Introduction (informative) .............................................................................................................79 8.2 Statements ......................................................................................................................................79 8.3 Blocking and nonblocking assignments ........................................................................................80 8.4 Selection statements.......................................................................................................................81 8.5 Loop statements .............................................................................................................................87 8.6 Jump statements.............................................................................................................................89 8.7 Final blocks....................................................................................................................................89 8.8 Named blocks and statement labels ...............................................................................................90 8.9 Disable ...........................................................................................................................................90 8.10 Event control..................................................................................................................................91 8.11 Level-sensitive sequence controls .................................................................................................93 8.12 Procedural assign and deassign removal .......................................................................................94 Section 9 Processes........................................................................................................................................ 95 9.1 Introduction (informative) .............................................................................................................95 9.2 Combinational logic.......................................................................................................................95 9.3 Latched logic..................................................................................................................................96 9.4 Sequential logic..............................................................................................................................96 9.5 Continuous assignments ................................................................................................................96 9.6 fork...join........................................................................................................................................97 9.7 Process execution threads ..............................................................................................................98 Accellera Extensions to Verilog-2001 SystemVerilog 3.1a Copyright 2004 Accellera. All rights reserved. ix 9.8 Process control ...............................................................................................................................98 9.9 Fine-grain process control ...........................................................................................................100 Section 10 Tasks and Functions................................................................................................................... 102 10.1 Introduction (informative) ...........................................................................................................102 10.2 Tasks ............................................................................................................................................103 10.3 Functions......................................................................................................................................104 10.4 Task and function argument passing ...........................................................................................106 10.5 Import and export functions.........................................................................................................109 Section 11 Classes.......................................................................................................................................... 111 11.1 Introduction (informative) ...........................................................................................................111 11.2 Syntax ..........................................................................................................................................112 11.3 Overview......................................................................................................................................113 11.4 Objects (class instance)................................................................................................................113 11.5 Object properties..........................................................................................................................114 11.6 Object methods ............................................................................................................................114 11.7 Constructors .................................................................................................................................115 11.8 Static class properties...................................................................................................................116 11.9 Static methods..............................................................................................................................116 11.10 This ..............................................................................................................................................116 11.11 Assignment, re-naming and copying ...........................................................................................117 11.12 Inheritance and subclasses ...........................................................................................................118 11.13 Overridden members....................................................................................................................119 11.14 Super ............................................................................................................................................119 11.15 Casting .........................................................................................................................................120 11.16 Chaining constructors ..................................................................................................................120 11.17 Data hiding and encapsulation .....................................................................................................121 11.18 Constant class properties .............................................................................................................121 11.19 Abstract classes and virtual methods ...........................................................................................122 11.20 Polymorphism: dynamic method lookup.....................................................................................123 11.21 Class scope resolution operator :: ................................................................................................123 11.22 Out of block declarations .............................................................................................................124 11.23 Parameterized classes ..................................................................................................................125 11.24 Typedef class ...............................................................................................................................126 11.25 Classes and structures ..................................................................................................................126 11.26 Memory management ..................................................................................................................127 Section 12 Random Constraints .................................................................................................................. 128 12.1 Introduction (informative) ...........................................................................................................128 12.2 Overview......................................................................................................................................128 12.3 Random variables ........................................................................................................................131 12.4 Constraint blocks .........................................................................................................................132 12.5 Randomization methods ..............................................................................................................145 12.6 In-line constraints — randomize() with.......................................................................................147 12.7 Disabling random variables with rand_mode() ...........................................................................148 12.8 Controlling constraints with constraint_mode() ..........................................................................149 12.9 Dynamic constraint modification.................................................................................................150 12.10 In-line random variable control ...................................................................................................150 12.11 Randomization of scope variables — std::randomize()...............................................................151 12.12 Random number system functions and methods .........................................................................153 12.13Random stability ..........................................................................................................................154 12.14 Manually seeding randomize .......................................................................................................156 12.15 Random weighted case — randcase ............................................................................................157 Accellera SystemVerilog 3.1a Extensions to Verilog-2001 x Copyright 2004 Accellera. All rights reserved . 12.16 Random sequence generation — randsequence...........................................................................158 Section 13 Interprocess Synchronization and Communication................................................................ 166 13.1 Introduction (informative) ...........................................................................................................166 13.2 Semaphores ..................................................................................................................................166 13.3 Mailboxes.....................................................................................................................................167 13.4 Parameterized mailboxes .............................................................................................................170 13.5 Event ............................................................................................................................................171 13.6 Event sequencing: wait_order() ...................................................................................................172 13.7 Event variables.............................................................................................................................173 Section 14 Scheduling Semantics................................................................................................................. 176 14.1 Execution of a hardware model and its verification environment ...............................................176 14.2 Event simulation ..........................................................................................................................176 14.3 The stratified event scheduler ......................................................................................................176 14.4 The PLI callback control points...................................................................................................180 Section 15 Clocking Blocks .......................................................................................................................... 181 15.1 Introduction (informative) ...........................................................................................................181 15.2 Clocking block declaration ..........................................................................................................181 15.3 Input and output skews ................................................................................................................183 15.4 Hierarchical expressions ..............................................................................................................184 15.5 Signals in multiple clocking blocks .............................................................................................185 15.6 Clocking block scope and lifetime...............................................................................................185 15.7 Multiple clocking blocks example ...............................................................................................185 15.8 Interfaces and clocking blocks.....................................................................................................186 15.9 Clocking block events..................................................................................................................187 15.10 Cycle delay: ## ............................................................................................................................187 15.11 Default clocking...........................................................................................................................188 15.12 Input sampling .............................................................................................................................189 15.13 Synchronous events .....................................................................................................................189 15.14 Synchronous drives......................................................................................................................190 Section 16 Program Block............................................................................................................................ 193 16.1 Introduction (informative) ...........................................................................................................193 16.2 The program construct .................................................................................................................193 16.3 Multiple programs........................................................................................................................195 16.4 Eliminating testbench races .........................................................................................................195 16.5 Blocking tasks in cycle/event mode.............................................................................................196 16.6 Program control tasks ..................................................................................................................196 Section 17 Assertions ................................................................................................................................... 198 17.1 Introduction (informative) ...........................................................................................................198 17.2 Immediate assertions....................................................................................................................198 17.3 Concurrent assertions overview...................................................................................................200 17.4 Boolean expressions ....................................................................................................................201 17.5 Sequences.....................................................................................................................................203 17.6 Declaring sequences ....................................................................................................................206 17.7 Sequence operations ....................................................................................................................208 17.8 Manipulating data in a sequence..................................................................................................224 17.9 Calling subroutines on match of a sequence................................................................................228 17.10 System functions..........................................................................................................................229 17.11 Declaring properties.....................................................................................................................229 17.12 Multiple clock support .................................................................................................................240 Accellera Extensions to Verilog-2001 SystemVerilog 3.1a Copyright 2004 Accellera. All rights reserved. xi 17.13 Concurrent assertions...................................................................................................................246 17.14 Clock resolution ...........................................................................................................................252 17.15 Binding properties to scopes or instances....................................................................................258 17.16 The expect statement ...................................................................................................................259 Section 18 Hierarchy..................................................................................................................................... 261 18.1 Introduction (informative) ...........................................................................................................261 18.2 Packages.......................................................................................................................................261 18.3 Compilation unit support .............................................................................................................265 18.4 Top-level instance........................................................................................................................266 18.5 Module declarations.....................................................................................................................267 18.6 Nested modules............................................................................................................................267 18.7 Extern modules ............................................................................................................................269 18.8 Port declarations ..........................................................................................................................270 18.9 List of port expressions................................................................................................................271 18.10 Time unit and precision ...............................................................................................................271 18.11 Module instances .........................................................................................................................272 18.12 Port connection rules ...................................................................................................................276 18.13 Name spaces ................................................................................................................................277 18.14 Hierarchical names ......................................................................................................................278 Section 19 Interfaces ..................................................................................................................................... 279 19.1 Introduction (informative) ...........................................................................................................279 19.2 Interface syntax............................................................................................................................280 19.3 Ports in interfaces.........................................................................................................................284 19.4 Modports ......................................................................................................................................285 19.5 Interfaces and specify blocks .......................................................................................................291 19.6 Tasks and functions in interfaces.................................................................................................291 19.7 Parameterized interfaces ..............................................................................................................297 19.8 Virtual interfaces..........................................................................................................................299 19.9 Access to interface objects...........................................................................................................303 Section 20 Coverage...................................................................................................................................... 305 20.1 Introduction (informative) ...........................................................................................................305 20.2 Defining the coverage model: covergroup...................................................................................306 20.3 Using covergroup in classes ........................................................................................................308 20.4 Defining coverage points .............................................................................................................309 20.5 Defining cross coverage...............................................................................................................315 20.6 Specifying coverage options ........................................................................................................319 20.7 Predefined coverage methods ......................................................................................................324 20.8 Predefined coverage system tasks and functions .........................................................................324 20.9 Organization of option and type_option members ......................................................................324 Section 21 Parameters .................................................................................................................................. 326 21.1 Introduction (informative) ...........................................................................................................326 21.2 Parameter declaration syntax .......................................................................................................327 Section 22 Configuration Libraries............................................................................................................. 330 22.1 Introduction (informative) ...........................................................................................................330 22.2 Libraries .......................................................................................................................................330 Section 23 System Tasks and System Functions ........................................................................................ 331 23.1 Introduction (informative) ...........................................................................................................331 23.2 Elaboration-time typeof function.................................................................................................331 Accellera SystemVerilog 3.1a Extensions to Verilog-2001 xii Copyright 2004 Accellera. All rights reserved . 23.3 Typename function ......................................................................................................................331 23.4 Expression size system function ..................................................................................................332 23.5 Range system function.................................................................................................................333 23.6 Shortreal conversions...................................................................................................................333 23.7 Array querying system functions .................................................................................................334 23.8 Assertion severity system tasks ...................................................................................................335 23.9 Assertion control system tasks.....................................................................................................336 23.10 Assertion system functions ..........................................................................................................336 23.11 Random number system functions...............................................................................................337 23.12 Program control ...........................................................................................................................337 23.13 Coverage system functions ..........................................................................................................337 23.14 Enhancements to Verilog-2001 system tasks ..............................................................................337 23.15 $readmemb and $readmemh........................................................................................................338 23.16 $writememb and $writememh .....................................................................................................338 23.17 File format considerations for multi-dimensional unpacked arrays ............................................339 23.18 System task arguments for multi-dimensional unpacked arrays .................................................340 Section 24 VCD Data .................................................................................................................................... 342 Section 25 Compiler Directives.................................................................................................................... 343 25.1 Introduction (informative) ...........................................................................................................343 25.2 ‘define macros..............................................................................................................................343 25.3 `include ........................................................................................................................................344 Section 26 Features under consideration for removal from SystemVerilog ........................................... 345 26.1 Introduction (informative) ...........................................................................................................345 26.2 Defparam statements....................................................................................................................345 26.3 Procedural assign and deassign statements..................................................................................345 Section 27 Direct Programming Interface (DPI) ....................................................................................... 347 27.1 Overview......................................................................................................................................347 27.2 Two layers of the DPI ..................................................................................................................348 27.3 Global name space of imported and exported functions..............................................................349 27.4 Imported tasks and functions .......................................................................................................349 27.5 Calling imported functions ..........................................................................................................355 27.6 Exported functions .......................................................................................................................356 27.7 Exported tasks..............................................................................................................................357 27.8 Disabling DPI tasks and functions...............................................................................................357 Section 28 SystemVerilog Assertion API .................................................................................................... 359 28.1 Requirements ...............................................................................................................................359 28.2 Extensions to VPI enumerations..................................................................................................359 28.3 Static information ........................................................................................................................360 28.4 Dynamic information ...................................................................................................................363 28.5 Control functions .........................................................................................................................366 Section 29 SystemVerilog Coverage API .................................................................................................... 368 29.1 Requirements ...............................................................................................................................368 29.2 SystemVerilog real-time coverage access ...................................................................................369 29.3 FSM recognition ..........................................................................................................................374 29.4 VPI coverage extensions..............................................................................................................377 Section 30 SystemVerilog Data Read API .................................................................................................. 381 30.1 Introduction (informative) ...........................................................................................................381 Accellera Extensions to Verilog-2001 SystemVerilog 3.1a Copyright 2004 Accellera. All rights reserved. xiii 30.2 Requirements ...............................................................................................................................381 30.3 Extensions to VPI enumerations..................................................................................................382 30.4 VPI object type additions.............................................................................................................383 30.5 Object model diagrams ................................................................................................................385 30.6 Usage extensions to VPI routines ................................................................................................387 30.7 VPI routines added in SystemVerilog .........................................................................................388 30.8 Reading data ................................................................................................................................389 30.9 Optionally unloading the data......................................................................................................399 30.10 Reading data from multiple databases and/or different read library providers ...........................399 30.11VPI routines extended in SystemVerilog.....................................................................................402 30.12VPI routines added in SystemVerilog .........................................................................................403 Section 31 SystemVerilog VPI Object Model............................................................................................. 407 31.1 Introduction (informative) ...........................................................................................................407 31.2 Instance .......................................................................................................................................409 31.3 Interface ......................................................................................................................................410 31.4 Program........................................................................................................................................410 31.5 Module (supersedes IEEE 1364-2001 26.6.1) ............................................................................411 31.6 Modport ......................................................................................................................................412 31.7 Interface tf decl ............................................................................................................................412 31.8 Ports (supersedes IEEE 1364-2001 26.6.5) .................................................................................413 31.9 Ref Obj.........................................................................................................................................414 31.10 Variables (supersedes IEEE 1364-2001 section 26.6.8) .............................................................416 31.11 Var Select (supersedes IEEE 1364-2001 26.6.8).........................................................................418 31.12 Typespec ......................................................................................................................................419 31.13 Variable Drivers and Loads (supersedes IEEE 1364-2001 26.6.23) ...........................................421 31.14 Instance Arrays (supersedes IEEE 1364-2001 26.6.2) ................................................................421 31.15 Scope (supersedes IEEE 1364-2001 26.6.3) ...............................................................................422 31.16 IO Declaration (supersedes IEEE 1364-2001 26.6.4) .................................................................423 31.17 Clocking Block ...........................................................................................................................424 31.18 Class Object Definition................................................................................................................425 31.19 Constraint, constraint ordering, distribution, ...............................................................................426 31.20 Constraint expression...................................................................................................................427 31.21 Class Variables ...........................................................................................................................428 31.23 Named Events (supersedes IEEE 1364-2001 26.6.11) ................................................................430 31.24 Task, Function Declaration (supersedes IEEE 1364-2001 26.6.18)............................................431 31.25 Alias Statement ...........................................................................................................................432 31.26 Frames (supersedes IEEE 1364-2001 26.6.20)............................................................................433 31.27 Threads.........................................................................................................................................434 31.28 tf call (supersedes IEEE 1364-2001 26.6.19) ..............................................................................435 31.29 Module path, path term (supersedes IEEE 1364-2001 26.6.15) .................................................436 31.30 Concurrent assertions ..................................................................................................................437 31.31 Property Decl ..............................................................................................................................437 31.32 Property Specification .................................................................................................................438 31.33 Multiclock Sequence Expression ................................................................................................439 31.34 Sequence Declaration .................................................................................................................440 31.35 Sequence Expression ..................................................................................................................441 31.36 Attribute (supersedes IEEE 1364-2001 26.6.42) ........................................................................442 31.37 Atomic Statement (supersedes IEEE 1364-2001 26.6.27) .........................................................443 31.38 If, if else, return, case, do while (supersedes IEEE 1364-2001 26.6.35, 26.6.36).......................444 31.39 waits, disables, expect, foreach (supersedes IEEE 1364 26.6.38) ...............................................445 31.40 Simple expressions (supersedes IEEE 1364-2001 26.6.25) ........................................................446 31.41 Expressions (supersedes IEEE 1364-2001 26.6.26) ....................................................................447 31.42 Event control (supersedes IEEE 1364-2001 26.6.30)..................................................................448 Accellera SystemVerilog 3.1a Extensions to Verilog-2001 xiv Copyright 2004 Accellera. All rights reserved . 31.43 Event stmt (supersedes IEEE 1364-2001 26.6.27) .....................................................................448 31.44 Process (supersedes IEEE 1364-2001 26.6.27) ..........................................................................449 31.45 Assignment (supersedes IEEE 1364-2001 26.6.28) ...................................................................449 Annex A Formal Syntax.............................................................................................................................. 451 Annex B Keywords ...................................................................................................................................... 488 Annex C Std Package ................................................................................................................................. 490 Annex D Linked Lists................................................................................................................................. 492 Annex E DPI C-layer .................................................................................................................................. 498 Annex F Include files .................................................................................................................................. 523 Annex G Inclusion of Foreign Language Code ......................................................................................... 529 Annex H Formal Semantics of Concurrent Assertions ............................................................................ 533 Annex I sv_vpi_user.h................................................................................................................................ 544 Annex J Glossary ........................................................................................................................................ 553 Annex K Bibliography................................................................................................................................. 555 Index 557

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