Building UVM Verification Environment from Scratch. id = 42; At this point you might be tempted to call the object “t1”. Writing Verilog test benches is always fun after completing RTL Design. Within a non-static class method, randomize() and this. In order to have the resource automatically retrieved two things must happen: First, that resource has to be registered with the factory using the field automation macros. uvm_object. The factory is a special class in UVM that creates an instance for you of whatever uvm_object or uvm_component type you specify. 만약 +UVM_OBJECT_DO_NOT_NEED_CONSTRUCTOR 옵션을 설정하는 경우 constructor를 기술하지 않을 수 있지만 권장하지는 않는다. メンバの型によって、さまざまあります。. Add a comment. sv & uvm_pkg. Implement the function "create()" `define m_uvm_object_create_func(T) function uvm_object create (string name=""); T tmp; `ifdef. path","label",value) (Adding other objects into the uvm_config_db is just as straightforward as adding a virtual interface. argument object. The concept of design patterns specifically for SystemVerilog object oriented programming (OOP) languages was popularized in 1994 by the book “Design Patterns: Elements of Reusable Object-Oriented Software. UVM is based on Open Verification Methodology (OVM) and Verification Methodology Manual (VVM). build_phase (phase) must be called in the. The code guideline for our verification environment is one class per file. The create function asks the UVM factory to create an object. The UVM application programming interface (API) defines a standard for the creation, integration, and extension of UVM Verification Components (UVCs) and verification environments that scale from block to system. Triggers the event, resuming all waiting processes. Users implement the body () method to interact. The first kind of queues store the handles to the uvm_resource objects that have the common field_name. 7,483 1 1 gold badge 25. ; Once you convert your testbench from passing individual values to passing config objects, you can see the bigger picture, which is that a testbench is configured and built from the top down, guided by the configuration. 1 Inheritance and Constraint Layering ¶ In our previous two posts in this series on Python as a verification language, we examined Python coroutines and using coroutines to create cocotb bus functional models. Typically configuration classes and data objects are derived from this class and are passed to different testbench components during the course of a simulation. Simple (non-parameterized) objects use the uvm_object_utils* versions, which do the following: Implements get_type_name, which returns TYPE as a string; Implements create, which allocates an object of type TYPE by calling its constructor with no arguments. You can: Derive your object_a from uvm_report_object instead of uvm_object. The driver receives the item and drives it to the DUT through a virtual interface. The verification testbench will be developed in UVM and has the following block diagram: The sequence generates a random stream of input values that will be passed to the driver as a uvm_sequence_item. For simple objects with no field macros, use `uvm_object_utils(TYPE) For simple. A block has one or more address maps, each corresponding to a physical. When set, metadata should be encoded as follows: For strings, pack an additional null byte after the string is packed. UVM automation macros can. The paper explains how UVM can be integrated with SystemC using the UVM-ML Open Architecture, a framework that enables interoperability between different. 1 I see a lot of articles which talk about whether you should be using field macros. You most likely compiled these two code classes separately in separate files. Overall Implementation To link the RAL with the configuration object, we initialize the registers in every configuration object as handlesThe callback pool is a singleton object that can be accessed by calling uvm_callbacks#(T)::get_global_pool() or uvm_component::get_callback_pool(), where T is the type of the UVM class or component. Class Hierarchy. A grandparent class of uvm_sequence_item is uvm_transaction, which contains the following field definitions: class uvm_transaction extends uvm_object; const uvm_event_pool events = new; uvm_event begin_event; uvm_event end_event; //. Type can be scalar objects, class handles, queues, lists, or even virtual interfaces) cntxt is the hierarchical starting point of where the database entry is. uvm_object クラスはアブストラクト・クラスである為、uvm_object のインスタンスを作る事は出 来ません。但し、uvm_object クラスのハンドルを定義する事は可能です。例えば、メソッドの引 数として generic なハンドルを宣言する為に使用する事. You can create an uvm_event. Such a. In our case, two uvm_queues are created; one for the "jb_if1" and the other for the "jb_if2". The most common UVM macros are: uvm_component_utils: registers a new class type when the class derives from the class uvm_component; uvm_object_utils: similar to uvm_component_utils, but the class is derived from the. Pass config objects inside your testbench with OOP-style set_config() methods, instead of the confusing uvm_config_db. It can be constructed from many different places, but normally a test might construct sequences and then run them – they embody the test. Instances of these lightweight proxies, representing every uvm_object-based and uvm_component-based object available in the test environment, are registered with the uvm_factory. During value or variable assignment to a variable, it is required to assign value or variable of the same data type. Typically configuration classes and data objects are derived from this class and are passed to different testbench components during the course of a simulation. These macros are called by the corresponding uvm_*_utils macros, so. Phases : UVM defines a set of simulation phases that enable users to control the order in which testbench components are created, initialized, and executed. module traffic ( input pclk, input presetn, input [31:0] paddr, input [31:0] pwdata. {"payload":{"allShortcutsEnabled":false,"fileTree":{"distrib/src":{"items":[{"name":"base","path":"distrib/src/base","contentType":"directory"},{"name":"comps","path. The create method internally makes a call to the factory to look up the requested type and then. Thus, it can save the simulation time and terminate it at an early state. The UVMObject class is the base class for all UVM data and hierarchical. UVM uses the concept of a factory where all objects are registered with it so that it can return an object of the requested type when required. get_next_item (t). The utils macros define the infrastructure needed to enable the object/component for correct factory operation. endclass This means that our long list of assignments that the copy expands to would also contain: copy. These macros are used to start sequences and sequence items on default sequencer, m_sequencer. With Easier UVM, configuration parameters should be accesed by calling uvm_config_db # (T)::get. 2, the UVM object factory now requires that uvm_object have a constructor. One thing that always confuses me: is whether add uvm_component parent in the class constructor of UVM objects or not. Through this interface, components issue the various messages with different severity levels that occur during simulation. What happens when both handles point to same object ? If we assign pkt to a new variable called pkt2, the new variable will also point to the contents in pkt. The UVM class library provides the basic building blocks for creating verification data and components. When someone wants to implement object names, what they'll do is pass a "string name" in the constructor of every object, so when the object is. uvm_component_param_utils uvm_object_param_utils. There are many kinds of design patterns. On calling `uvm_do () the above-defined 6 steps will be executed. You need to create an array of ral_block_traffic_cfg objects: rand ral_block_traffic_cfg cfg [2]; You created an array of type uvm_reg_block, named it ral_cfg, but it has nothing to do with the ral_block_traffic_cfg object. 02. The configuration object also allows for a higher-level view of the DUTs functions, providing test writers with an abstracted constraint layer not tied to the underlying registers. It is an abstract class with no data members or functions. Type override in UVM factory. So all you need to do is remove the type E parameter declaration. wait_trigger_data. The run_phase is a thread started automatically by the UVM core. Similarly uvm_object::compare() calls the __m_uvm_field_automation() with UVM_COMPARE. sv and the many svh files for the class files (reg, tlm, macros, drivers. uvm_object is the one of the base classes from where almost all UVM classes are derived. 03 Operators 01. Now we are going to look at the next step, the Universal Verification Methodology (UVM) implemented in Python. 02. Phases : UVM defines a set of simulation phases that enable users to control the order in which testbench components are created, initialized, and executed. Improve this answer. Share. virtual function void print_object (string name, uvm_object value, byte scope_separator = ” . That means the default value is going to be used in new(). The uvm_resource_base class is a common base class for the resource container family that defines a set of functions. com Each component goes through a pre-defined set of phases, and it cannot proceed to the next phase until all components finish their execution in the current phase. Place the callback hook. Inline constraints (i. Core class based operational methods (create, copy,. // For example, "set_type_override_by_type" is actually a function defined in the class uvm_factory // A wrapper function. In our case, two uvm_queues are created; one for the "jb_if1" and the other for the "jb_if2". System Verilog has virtual methods, virtual interfaces, and virtual classes. These levels are nothing but integer enum values (the parentheses in the figure show the values). {"payload":{"allShortcutsEnabled":false,"fileTree":{"distrib/src/reg":{"items":[{"name":"sequences","path":"distrib/src/reg/sequences","contentType":"directory. If we already have a data object that we simply want to send to a sequencer, we can use `uvm_send. logger. The UVM methodology enables engineers to quickly develop powerful,. ” )The utility macro `uvm_object_utils registers this class with the factory, which we will discuss later, and allows access to the create method which is needed for cloning. trigger. 613. UVM tutorial for beginners Introduction Introduction to UVM UVM TestBench TestBecnh Hierarchy and BlockDiagram UVM Sequence item Utility & Field Macros Methods with example Create Print Copy Clone Compare Pack UnPack UVM Sequence Sequence Methods Sequence Macros Sequence Example codes UVM Sequence control UVM. This section defines the proxy component and object classes used by the factory. 2. It serves an important role to define a set of methods such as create, copy, print, clone, compare, record, etc. Unfortunately, SystemVerilog does not provide a good way to saveThere are two important aspects to pay attention to here: Use the `uvm_do_callbacks macro to call the appropriate function from our base callback class ; Use the `uvm_register_cb macro to register the callback class (acme_callback_addr_width) with the given object type (acme_env_config); Step #4: Define custom callback functions. I can't use a generate loop inside the class and I couldn't find out a way to use a for loop to pass the individual parameters. Then you can do: typedef uvm_object_registry# (abc_test_seq,`STR (`SEQ_NAME (abc))) type_id;. It is. Pass config objects inside your testbench with OOP-style set_config() methods, instead of the confusing uvm_config_db. If you are using OVM/UVM then get_full_name() / get_name() will return the name of the component in the testbench hierarchy. So I then downloaded UVM 2017-1. 02. When a callback is attached to an event, the attached callback function/s is called each time the event is triggered. 3. macro: Can be used, but try to avoid if you are. Let's take an example of three sequences, all derived from the same base_sequence class, as we. We’ve already talked about how the factory uses uvm_object_wrappers to perform the actual creation and maps type names to such objects. Then you can do: typedef uvm_object_registry# (abc_test_seq,`STR (`SEQ_NAME (abc))) type_id;. get_type_name is a virtual function. We would like to show you a description here but the site won’t allow us. They are distinct objects. Functions. These work predictably with non-parameterized classes as shown here. In a previous article , print, do_print and use of automation macros to print were discussed. Accellera believes standards are an important ingredient to foster innovation and continues to encourage industry innovation based on its standards. The compare method returns 1 if comparison matches for the current object when it is compared with the R. Add a comment. Code compiled in one compilation unit is not visible to another compilation unit. Factory is a singleton object and there is only one instance of the factory in a UVM environment. method_call() is really method_call(. T he run_phase is implemented as a forever begin-end loop. 1 min read. You need to create a uvm_object temp variable, then do an explicit dynamic cast, e. uvm_component::set_inst_override (relative_inst_path, original_type_name, override_type_name) The fourth method is using the set_inst_override function of the uvm_component. uvm_object The primary role of uvm_object class is to define a set of common utility functions like print, copy, compare and record which can be availed by any other class in a UVM testbench to save effort. // my_env is user-given name for this class that has been derived from "uvm_env" class my_env extends uvm_env; // [Recommended] Makes this driver more re-usable `uvm_component_utils (my_env) // This is standard code for all. You can use the uvm_object_registry (T,S) or uvm_component_registry (T,S) registration macros. raise_objection()을 호출하면 uvm_object 클래스의 카운트가 증가해서 0 값이 아닌 다른 값을 가지게 되고 그러면 uvm_phase의 phase executer가 시뮬레이션을 종료하지 않게 됩니다. Register the callback class. Say the object is "my_tb". Its primary role is to define a set of methods for such common operations as create, copy,. Since the RTL code does not know anything about the test class, it uses a null handle, and “uvm_test_top“, the instance name of the test object. You can use wildcards in the. uvm_object has both as seen in its constructor. 02. Divide the DB into smaller domains by grouping values into config objects. That means the other parameter Tname of. UVM automation macros also include mechanisms to pack class variables into a bit or byte stream, and unpack a bit stream and populate the class contents. There are two important parts to using the factory. Built in types (such as ints, bits, logic, and structs) can be compared using the default values for comp_type, convert, and pair_type. pyuvm uses cocotb to interact with the simulator and schedule simulation events. This is applicable for uvm objects and components. Factory is a singleton object and there is only one instance of the factory in a UVM environment. You're trying to assign a handle of base class type to a handle of derived class type, which isn't allowed in SV. The function that is actually called depends on the context where the macro is used. The verification testbench will be developed in UVM and has the following block diagram: The sequence generates a random stream of input values that will be passed to the driver as a uvm_sequence_item. The first kind of queues store the handles to the uvm_resource objects that have the common field_name. A resource is any piece of information that is shared between more than one component or object. base. We would like to show you a description here but the site won’t allow us. `uvm_object_param_utils_begin. Let’s call the record in our jelly bean scoreboard. By applying stimulus to the register model, the actual design registers will exhibit the changes applied by the stimulus. The uvm_object class is the base class for all UVM data and hierarchical classes. 1, the presence of such a constructor is not enforced by the library and they are technically optional. by extending the uvm_object or the uvm_sequence_item base class. 2) Add "-clean" to the irun command. It is then placed into the configuration database using uvm_config_db so that other testbench components within this environment can access the object and configure sub components accordingly. Its primary role is to define a set of methods for such common operations as create, copy, compare, print, and record . 用途は、UVMの「オートメーション」機能を適用するために使います。. `uvm_object_utils. print(); Use the uvm_object_utils and uvm_field_* macros in your uvm_sequence_item class to control what gets printed. I have tried to import it into my project and it seems like the errors were from a wrong compilation order: "uvm_object is not declared", "uvm_barrier is already declared", etc. module traffic ( input pclk, input presetn, input [31:0] paddr, input [31:0] pwdata. UVM_DEFAULT specifies. uvm_object has many common functions like print, copy and compare that are available to all its child classes and can be used out of the box if UVM automation macros are used inside the class definition. 07 Flow Control 01. UVM FACTORY. 39. Similarly uvm_object::compare() calls the __m_uvm_field_automation() with UVM_COMPARE. For more efficient and more flexible implementation, we can use user definable do_*() hooks. In the begin-end block the driver calls seq_item_port. uvm_object is basically the main class. 1. 04 Packed and Unpacked arrays 01. 1 Class Reference is a comprehensive document that describes the classes, methods, macros, and callbacks that constitute the UVM 1. zhang@amd. If we expand the macro, it will call m_uvm_object_registry_param(T) define where there is a typedef of uvm_object_registry#(T). randomize with {…} or `uvm_do_with) permit specifying additional constraints when randomizing an object. 1. Macro. March 24, 2021. Macro. In UVM, is there anything in the uvm_object::compare method or uvm_comparer policy to implement a different comparison similar to the VMM compare() kind argument? For example, I would like a mechanism to be able to select between doing a full compare of all object members or a partial subset compare. Is there a command-line command to change the verbosity for a uvm_object (like a configuration object)? For components, I use: +uvm_set_verbosity=test_top. Similarly, in the second line, the all to the "uvm_root" static get method returns a reference to the top-level "uvm_root" object and we are calling the "set_timeout" method on that object. uvm_mem. The UVM TLM library defines several abstract, transaction-level interfaces and the ports and exports that facilitate their use. Requirements. this(obj)). 2 Comments. Memory abstraction base class. The events provide synchronization between processes by triggering an event from one process and waiting for that event in another process to be triggered. svh compiler cannot resove monitor as it doesn't know that type. Some Standard Data Methods of the uvm_object Class By now you might think that these field macros are convenient but not efficient. ” ) Prints an object and it is recursed depending on depth knob setting. The uvm_analysis_port is a specialized TLM based class whose interface consists of a single function write () and can be embedded within any component as shown in the snippet below. The handle to the uvm_resource object is stored in two kinds of uvm_queues. This is not a complete design since our purpose is simply to show how registers in this design can be read/written using a UVM register model. The reason being packet and packetD are type compatible, since packetD is an extension of packet. FollowSimple (non-parameterized) objects use the uvm_object_utils* versions, which do the following: Implements get_type_name, which returns TYPE as a string; Implements create, which allocates an object of type TYPE by calling its constructor with no arguments. 1 class-based verification library and reuse methodology for SystemVerilog. The source of this command can be traced to the following: (1) tb_driver is an extension of uvm_driver, which is an extension of uvm_component, which is a derivative of. Length: 4 Days (32 hours) The Universal Verification Methodology (UVM) is the IEEE1800. Uvm factory is one of the most notable term when using uvm methodology. The singleton instance of uvm_coreservice_t provides a common point for all central uvm services such as uvm_factory, uvm_report_server and so on. registered with the factory using `uvm_object_utils, `uvm_component_utils, etc. It allows for generic containers of objects to be created, similar to a void pointer in the C programming language. 02. There are many kinds of design patterns. gz. The intention behind a virtual function is to support polymorphism. The handle to the uvm_resource object is stored in two kinds of uvm_queues. In our case, two uvm_queues are created; one for the "jb_if1" and the other for the "jb_if2". This guide is a way to apply the UVM 1. It is an abstract class with no data members or functions. S. 1. It allows for generic containers of objects to be created, similar to a void pointer in the C programming language. virtual function uvm_object. User classes derived directly from uvm_void inherit none of the UVM functionality, but such classes may be. To avoid the overhead of creating an instance of every component and object that get registered, the factory holds lightweight wrappers, or proxies. : bit get(uvm_component cntxt, string inst_name, string field_name, inout T. Conclusion. To implement some important methods in classes and variables, UVM provides the UVM Macros. The recommended method in UVM for creating components or transaction objects is to use the built-in method::type_id::create () instead of calling the constructor new () directly. Even the uvm_object_registry and uvm_component_registry classes contain a lot of duplicated code that could have been refactored. Static components & Dynamic components. It attempts to mirror the design registers by creating a model in the verification testbench. The clone () method was declared in uvm_object and returns a handle of type. The `name` input is used for purposes of storing and printing a miscompare. do_pack. This method calls uvm_event_base::wait_trigger followed by get_trigger_data. Step #1: Create a base callback class. Variable S3 is declared next & creates an Object of the Class “stack” with the default Parameter is set to an “int“. It supports all methods like copy, compare, clone, print, etc as discussed in the UVM object section. A uvm_queue is created for every unique field_name. Classes deriving from uvm_object must implement the pure virtual methods such as create and get_type_name. 2) from Accellera. Description. A cleaner way would be to use the sequence library provided by UVM as uvm_sequence_library. uvm_config_db#(TYPE)::set(this,"*. uvm_reg_sequence. answered Jun 19, 2014 at 23:32. Gets the data, if any, provided by the last call to trigger. Example 1 - Standard new() constructor for UVM components For transactions (data objects), each object is a unit of data with multiple fields, and transactions do not have a parent. Description. This locking mechanism is implemented using lock and grab methods. In order to create a user-defined sequence : Derive from uvm_sequence base class with a specified data object type. Here is a transaction class. A UVM sequence is just a SystemVerilog object that is constructed by calling new. 4. – dave_59. `uvm_object_utils_begin. Policy classes are used to implement polymorphic operations that differ between built-in types and class-based types. 02. The recommended method in UVM for creating components or transaction objects is to use the built-in method::type_id::create () instead of calling the constructor new () directly. The service class provides a static <::get> which returns an instance adhering to uvm_coreservice_t. `uvm_object_param_utils. So UVM phases act as a synchronizing mechanism in the life cycle of a simulation. uvm_object has many common functions like print, copy and compare that are available to all its child classes and can be used out of the box if UVM automation macros are used inside the class definition. For transactions, the typical constructor is shown in Example 2. pyuvm implements the most often-used parts of the UVM while taking advantage of the fact that Python does not have strict typing and. The word “factory” in UVM refers to the substitution of any object or component in the verification environment without modifying any part of code in any testbench. To avoid the overhead of creating an instance of every component and object that get registered, the factory holds lightweight wrappers, or proxies. Classes deriving from UVMObject must implement methods such as create and get_type_name. In create method, we have to construct a new object of configuration class and update all the important fields and return it. If the processes to trigger and wait for a trigger of an event are running in different components then it is required to share the event handle across the components. It seems to me that the monitor class is missing from the scope of the soc_uvm_env in other words during compilation of soc_uvm. SystemVerilog allows you to create modules and classes that are parameterized. uvm_config_db#(TYPE)::set(this,"*. Here is my thought/search process: I've found that uvm_factory class has a register method which registers a proxy object of a given type. The main advantages of using these macros are: 2021年4月下旬発行予定の新刊書籍、『実践UVM入門：検証のためのSystemVerilogクラスライブラリー』のご紹介です。 同書の「はじめに」を、発行に先駆けて公開します。 実践UVM入門 検証のためのSystemVerilogクラスライブラリー | 森北出版株式会社 ＊＊＊ はじめに UVMはIEEEStd1800. 1 Answer. uvm_report_error(). UVM TestBench to verify Memory Model. Factory is a singleton object and there is only one instance of the factory in a UVM environment. This applies to all instances of that component type. These macros can appear anywhere in the declaration space of the class declaration of T and will associate the string S to the object type T. class my_driver. factory. The factory infrastructure is responsible forWe would like to show you a description here but the site won’t allow us. 08 Subroutines 01. Writing user-defined callback, class user_defined_callback extends uvm_event_callback; --- endclass. This makes them more flexible, and able to work on a range of data types instead of just a single one. They allow access to the functions copy, compare, pack, unpack, record. The record function of uvm_object calls the do_record. *,_ALL_,UVM_DEBUG,run I want to leave the entire testbench verbosity as sv_medium, except for one object of the following class. You can either have a drive_item task in the driver, or you can call a. Uvm_env. When set, metadata should be encoded as follows: For strings, pack an additional null byte after the string is packed. Methods: Description: set(uvm_component cntxt, string inst_name, string field_name, T value); Create a new or update an existing field_name configuration setting based on cntxt and inst_name. Pack A class called Packet is defined with some variables to store address and data, and is registered with `uvm_field_int macros to enable automation. uvm_resource_pool rp = uvm_resource_pool::get(); uvm_resource#(T) _type = new(); uvm_queue#(uvm_resource_base) q; q =. If you haven't included the file "monitor. That is different from the strategy that you might choose in order to drive signals. Length: 4 Days (32 hours) The Universal Verification Methodology (UVM) is the IEEE1800. 그래서 uvm_phase는 uvm_object 클래스를 이용해 시뮬레이션 시작, 끝을 결정합니다. The utility macros help to register each object with the factory. A message with the UVM_NONE level is. Every uvm_object instance has a compare() method for performing comparisons with another object. All components and object classes in a UVM environment are derived from uvm_object base class. Using do_copy. 01 Simulation 환경 01장 SystemVerilog for Testbench 01. 이때 아래의 그림과 같이 agent내부에서는 어떤 configuration이 uvm_config_db를 통하여 설정됨을 가정하여 get ()으로. In the case of UVM based System Verilog testbench, class objects can be created at any time during the simulation based on the requirement. We would like to show you a description here but the site won’t allow us. It makes sense to include print features in uvm_object so that all child classes will automatically gain access to those features. UVM provides a transaction class that can be extended to create transaction objects that carry information between the DUT and the testbench. For Design specification and Verification plan, refer to Memory Model. UVM Heartbeat Usage. Once unzipped, I see the source files with uvm. this(this)) and obj. Using UVM in SystemC is a tutorial paper that presents the benefits and challenges of applying the Universal Verification Methodology (UVM) to SystemC-based verification environments. UVM Factory Override. This method calls uvm_event_base::wait_trigger followed by get_trigger_data. This command is going to call the ::type_id::create command from the tb_driver, which happens to be code largely inherited from other macros and classes. Connect and share knowledge within a single location that is structured and easy to search. Classes derived from uvm_object must implement the pure virtual methods such as create. get_trigger_data. B. I found having parameters in uvm_object/uvm_componet is handy in some case, but I know some one think it is a bad idea. wait_ptrigger_data. 2 Class Reference represents the foundation used to create the UVM 1. An appropriate `uvm_field_* macro is required to use based on the data type of class properties. These macros are used to start sequences and sequence items on default sequencer, m_sequencer. A whole new worldThis modelsim seems to only have compiled libraries for device support primitives. `uvm_create (Item/Seq) This macro creates the item or sequence. We’ll examine pyuvm’s implementation TLM 1. SNUG 2012 6 The OVM/UVM Factory & Factory OverridesThe UVM register layer acts similarly by modeling and abstracting registers of a design. Share. Alternatively, if the change is intended to be global, there is a default printer that automatically created at root called uvm_default_printer . user_callback callback_1; callback_1 = user_callback::type_id::create ("callback_1", this); In order to execute the callback method, register the callback object to the driver using. If you use the uvm_top. The benefit of this approach comes from. 05 Data Arrays 01. Using automation macros. UVM also introduces a bunch of automation mechanisms for implementing print, copy, and compare objects and are defined using the field macros. Both the main sequence and the other sequence get an uvm_event with. ), instance identification fields (name, type name, unique id, etc. uvm_object ¶. To maintain uniformity in naming the components/objects, all the component/object name’s are starts with mem_ *. UVM Field Macros. ; It is singleton class. as you can see from your log that isnt the case for IUS. After new'ing , it uses set_name() to assign the appropriate value to the name string. A message with the UVM_NONE level is.