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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 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 memb er 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 memb ership..............................................................................................................................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 th read s ..............................................................................................................98 Accellera Extensions to Verilog-2001 SystemVerilog 3.1a 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 memb ers....................................................................................................................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 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 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 memb ers ......................................................................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 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 $ read memb and $ read memh ........................................................................................................338 23.16 $ write memb and $ write memh .....................................................................................................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 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 Read ing data ................................................................................................................................389 30.9 Optionally unloading the data......................................................................................................399 30.10 Read ing 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 Th read s.........................................................................................................................................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 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 Verilog 提供了很多可以对文件进行操作的系统任务。$fopen$fclose$ferror$fdisplay$f write $fstrobe$fmonitor$sformat$s write $fgetc$fgets$fscanf$f read $fseek$ftell$feof$frewind$ read memh $ read memb 使用文件操作任务（尤其注意 $sforamt, $gets, $sscanf。 Welcome to the XML Bible. After read ing this book I hope you’ll agree with me that XML is the most exciting development on the Internet since Java, and that it makes Web site development easier, more productive, and more fun. This book is your introduction to the exciting and fast growing world of XML. In this book, you’ll learn how to write documents in XML and how to use style sheets to convert those documents into HTML so legacy browsers can read them. You’ll alsolearn how to use document type definitions (DTDs) to describe and validate documents. This will become increasingly important as more and more browsers like Mozilla and Internet Explorer 5.0 provide native support for XML. RISC-V 32i CPU和汇编器这是HKUST ELEC-5140高级计算机体系结构的课程项目材料之一，鼓励学生增强结构模型并改善其性能。该项目正在运行，由维护。任何讨论或建议，将不胜感激！ RV32i目录包含一个用verilog编写的RISC-V CPU的Vivado项目，该项目实现了5级单问题处理器，支持31条基本指令。 RISC-V_Assembler目录包含一个汇编程序，用于将RISC-V指令汇编转换为十六进制格式，可以在Vivado仿真过程中通过$ read memh 轻松将其直接直接加载到指令存储器中。测试目录包含以RV32i程序集编写的基准。 Vec_Mul是一个基本的编码示例。该汇编器支持什么： add s1, t1, t2 # s1 = t1 + t2 slti s1, t1, 3 # if t1 < 3: s1 = 1 rand bit[31:0] src_data[] ; fid = $sformatf("../tests/src/my_init_%02.hex", src_type) ; `u... $finish：在进行电路仿真时，如果遇到$finish，仿真器完成仿真并退出。 $stop：当遇到$stop时，仿真器停止仿真，但不退出，它同时提供一个命令提示符，在命令提示符后面输入“.”, 则仿真过程继续进行 $display：显示调试信息、错误或异常情况。 $monitor：仅当$monitor监视的信号发生变化时才在屏幕上显示它的信号数值。 $time：返回仿真器当前仿真时间 $realtime：以实数的方式返回当前仿真时间，包含小数部分 $random：每次调用$random任务，它本文主要讲述Testbench中如何读取和存储文本文件的数据，涉及到基础的Verilog语法。对一些数据处理的模块进行调试仿真，模块需要特定的数据输入，比如单一频率的正弦波；为了解决这个问题，我们可以用matlab，python等工具生成文本数据，然后使用Verilog将数据读取进来；Testbench可以使用2种方法进行文本数据操作 read memb , read memh , write memb , write memh 操作 fscanf, f write 等操作 read memb , read memh , wr 菜鸟一枚，只是分享一下在学习的过程，和这两个系统函数的简单用法，$ read memb 和$ read memh 用来从文件中读取数据到存储器中。读取的内容只包括：空白位置（空格、换行、制表格(tab和form-feeds),注释行、二进制或十六进制的数字。数字中不能包含位宽说明和格式说明，其中 read memb 要求每个数字是二进制数， read memh 要求每个数字必须是十六进制数字。数字中不定值x或X，高阻值z... 在 example 下面，用于从带有systemverilog的二进制文件中读取 .如IEEE SV 标准文档中所示， "nchar_code" 将返回读取的字节数/字符数 . 如果在上次读取时已经达到EOF，则该数字将为零 . 请注意，“ nchar_code ”可以为零 but 尚未达到EOF，如果在数据文件的末尾有空格或返回，则会发生这种情况 .您可以使用$ f read 函数控制要读取的字节数 ... 转载：https://blog.csdn.net/winson_cys/article/details/100175964?depth_1-utm_source=distribute.pc_relevant.none-task&utm_source=distribute.pc_relevant.none-task Verilog编写testbench时，系统函数比较常用的一般为displ... 原文网站：vivado 仿真工程中$ read memh 使用 – 芯片天地在verilog 仿真中，有时会使用$ read memh 系统函数，帮助仿真者快速装载仿真所使用的数据。在一些简单的仿真中，我们可以通过initial 来加载仿真的数据，但是当仿真数据比较多的情况下，就需要使用系统函数加载数据了。$ read memh 系统函数就是用来帮助开发者加载仿真数据的。$ read memh 系统函数本身具有文件操作功能，因此不需要$fopen等文件操作。通常来说， $ read memh 也被归为文件操作类型的...