Factory is a singleton object and there is only one instance of the factory in a UVM environment. uvm_factory. That is different from the strategy that you might choose in order to drive signals. // For example, "set_type_override_by_type" is actually a function defined in the class uvm_factory // A wrapper function. UVM Factory Override. The utils macros define the infrastructure needed to enable the object/component for correct factory operation. The UVM TLM library defines several abstract, transaction-level interfaces and the ports and. uvm_object-based class declarations may contain one of the above forms of utility macros. UVM 1. The UVM Test typically performs three main functions: Instantiates the top-level environment, configures the environment (via configuration objects, factory overrides or the configuration database), and applies stimulus by. get_trigger_data. For overriding uvm_object or sequences, type overriding is recommended to use since instance overriding requires a hierarchical path. logger. Sorted by: 1. `uvm_object_param_utils_begin. // For example, "set_type_override_by_type" is actually a function defined in the class uvm_factory // A. UVM FACTORY. Its intention is to print the name of the type of a given object instance. If you want to use the fifo path, you need to create and connect a generic port in the driver class. But, virtual_sequence and virtual_sequencer do not require any virtual keyword. Pass config objects inside your testbench with OOP-style set_config() methods, instead of the confusing uvm_config_db. Inside a uvm_env class, I try to create an array of another uvm_env class. UVMObject. UVM Heartbeat Usage. It helps increase flexibility and resuability of our testbench. The SystemVerilog UVM contains a uvm_printer class, which provides an interface for printing uvm_objects in various formats. Accellera believes standards are an important ingredient to foster innovation and continues to encourage industry innovation based on its standards. Later on, we want to run the same set of tests created above, using the same transaction. A flat uvm_config_db with wildcard scopes and many entries can be a performance hog. You need a uvm_sequencer with seq_item_export to connect to the driver's seq_item_port. UVM TestBench architecture. The reason when case2 work is that P1 is assigned to P2 as P2 handle, so a cast from P2 to P2 itself is always ok. The print method is used to deep print UVM object class properties in a well-formatted manner. These macros are used to start sequences and sequence items on default sequencer, m_sequencer. . 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. uvm_resource_db; uvm_config_db; Passing interface handle and two agent example; UVM testbench Top; UVM Test; UVM Environment; UVM Sequence Items; UVM Driver;The uvm_driver is parameterized to accept a class object of the type my_data and the driver is expected to unpack this class object and drive the signals appropriately to the DUT via the interface. The intention behind a virtual function is to support polymorphism. Uvm_env. A configuration object is created inside the test class & this configuration object contains a virtual interface property. It is an abstract class with no data members or functions. Unfortunately this wont work yet because we have to register seq_item as follows `uvm_object_param_utils(seq_item#(A)). uvm_component like uvm_driver is always connected to a particular DUT interface because throughout the simulation its job is fixed i. There are different variations to this macro, just like `uvm_do_*. These levels are nothing but integer enum values (the parentheses in the figure show the values). 2. In our case, two uvm_queues are created; one for the "jb_if1" and the other for the "jb_if2". Triggers the event, resuming all waiting processes. UVM Field Macros. These Subtypes include uvm_printer, uvm_line_printer, uvm_tree_printer, uvm_table_printer. Inline constraints (i. 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. Only classes derived from uvm_component have knowledge of their parentage. That means the default value is going to be used in new(). The UVM is completely described in the IEEE 1800. 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. 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. Previous Article. event_object event_object_h; uvm_object temp_obj; . 2 Class Reference represents the foundation used to create the UVM 1. Interfaces can contain tasks, functions, parameters, variables, functional coverage, and assertions. 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. In the UVM, there are mechanisms to automate the retrieval of data from the configuration database. Step #1: Create a base callback class. trace_mode(): Set or get the trace mode for the objection object. SNUG 2012 6 The OVM/UVM Factory & Factory OverridesThe UVM register layer acts similarly by modeling and abstracting registers of a design. Macro. 1. uvm_object::new says that m_inst_id == m_inst_count++. Nearly all UVM classes are extended from uvm_object. They are dynamic in nature and have a limited lifetime within the simulation. UVM Testbench 작성 00장 둘러보기 00. to drive the designated signals into DUT. ) and random seeding were defined in it. That method looks through an array of type overrides to see if you ever called set_type_override() for this class, then calls new() for. uvm_object. 2 Class Reference is independent of any specific design processes and is complete for the construction ofThe UVM 1. the uvm_event class makes it easy by providing uvm_event_pool. To maintain uniformity in naming the components/objects, all the component/object name’s are starts with mem_ *. Users can configure what actions are taken and what file(s) are output for individual messages from a particular component or for all. We have already seen how to use `uvm_do set of macros. With Easier UVM, configuration parameters should be accesed by calling uvm_config_db # (T)::get. uvm_object is the main class in which common functions to print, copy, and compare two objects of the same class are defined. The `name` input is used for purposes of storing and printing a miscompare. Fundamentals of SystemVerilog Testbench Environment. argument object. It has various methods to create different uvm_component or uvm_object instances and also to override it. 02. class uvm. For simple objects with no field macros, use `uvm_object_utils(TYPE) For simple. UVM components can represent various parts of the testbench, such as a top-level testbench, an interface, an agent, or a sequencer. 613. If you haven't included the file "monitor. uvm_object is the one of the base classes from where almost all UVM classes are derived. env. 02 Data Types 01. 2에서는 반드시 constructor를 기술하여야 한다. def compare_field (self, name, lhs, rhs, size, radix = UVM_NORADIX): """ Function: compare_field Compares two integral values. {"payload":{"allShortcutsEnabled":false,"fileTree":{"distrib/src/reg":{"items":[{"name":"sequences","path":"distrib/src/reg/sequences","contentType":"directory. UVM_WARNING @ 0: reporter [TPRGED] Type name 'packet2mem_comp_Str' already registered with factory. When the factory is called upon to create an object. 1. Using start_item/finish_item methods. Refer to “Macros” in the UVM 1. Here are the general steps to create and use a register. For transactions, the typical constructor is shown in Example 2. Every uvm_object instance has a compare() method for performing comparisons with another object. Memory abstraction base class. e. Policy classes are used to implement polymorphic operations that differ between built-in types and class-based types. These work predictably with non-parameterized classes as shown here. The utility macros help to register each object with the factory. The rest of the set_ get_ pairs provide access to the internal uvm servicesUVM 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. `uvm_field_intとは. The uvm_object_wrapper provides an abstract interface for creating object and component proxies. You need to create a uvm_object temp variable, then do an explicit dynamic cast, e. The benefit of this approach comes from. So all you need to do is remove the type E parameter declaration. Specialization #(virtual xbus_ifc) the data type of the value, which here is a virtual Xbus interface handle. Let’s look at how we. UVM also introduces a bunch of automation mechanisms for implementing print, copy, and compare objects and are defined using the field macros. get_type_name is a virtual function. Enjoy your verification journey!SystemVerilog functions have the same characteristics as the ones in Verilog. Variable S3 is declared next & creates an Object of the Class “stack” with the default Parameter is set to an “int“. User classes derived directly from uvm_void inherit none of the UVM functionality, but. Bases: object. 02. Classes deriving from uvm_object must implement the pure virtual methods such as create and get_type_name. get_next_item (t). 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. If we were to have a variable of type uvm_object (where get_type_name is first defined), we could store. We remember the file and line number, and the calling context (the. 4) uvm_object required to define the uvm_object::creat() method. 09. You can also use get_id(), get_message() etc. 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. We would like to show you a description here but the site won’t allow us. A scope is a context like an instantiation of the component in the uvm. After new'ing , it uses set_name() to assign the appropriate value to. Pass config objects inside your testbench with OOP-style set_config() methods, instead of the confusing uvm_config_db. 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. uvm_report_object. So, a data class derived from uvm_sequence_item or uvm_component will have access to the print() function as well. 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_do_obj_callbacks(T, CB, OBJ, METHOD) It is similar to `uvm_do_callbacks macro, but it has an additional OBJ argument to specify external object associated with the. 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. – dave_59. The service class provides a static <::get> which returns an instance adhering to uvm_coreservice_t. Its primary role is to define a set of methods for such common operations as create, copy, compare, print, and record . This is known as the UVM factory override mechanism. get_trigger_data. Inside the test class, another uvm_config_db method i. Triggers the event, resuming all waiting processes. 1, the presence of such a constructor is not enforced by the library and they are technically optional. trigger. PyUVM Description. ; uvm_resource_db is the parent class of uvm_config_db, which is used to set different values in the registry and. This can be useful for peak and off-peak times. 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. Bases: uvm. However, I downloaded the UVM library from accelera's website and looked at the code and it looks like it's just some SystemVerilog. After new'ing , it uses set_name() to assign the appropriate value to the name string. uvm_object is basically the main class. 4. A uvm_queue is created for every unique field_name. class my_driver. A message with the UVM_NONE level is. UVM utility & field macros. It allows for generic containers of objects to be created, similar to a void pointer in the C programming language. As an additional aside, it's also important to acknowledge that while uvm_object does provide a pack/do_pack/do_unpack interface, there's zero restrictions on where a packer can actually be used. Since this Specialization matches to the Specialization created when we created a typedef “ stack_int ” above, it uses the existing Specialization & the “ counter ” associated with default Specialization will left. `uvm_create (Item/Seq) This macro creates the item or sequence. Using do_pack/do_unpack. Since the uvm_sequence_item class is extended from the uvm_object class, it inherits the print method which is used to display the class variables. zhang@amd. Within a non-static class method, randomize() and this. pyuvm implements the most often-used parts of the UVM while taking advantage of the fact that Python does not have strict typing and. 39. The set_type_override() is another static function of the uvm_object_registry. As you see the following diagram, the uvm_object::copy() calls the __m_uvm_field_automation() with UVM_COPY as the value of the what__. UVM pre-defines six verbosity levels; UVM_NONE to UVM_DEBUG. H. A cleaner implementation would have been for uvm_component_registry to be its own class. The uvm_printer class provides an interface for printing uvm_object s in various formats (line 1). It is an object that is used for instantiating other objects. UVM 상세 사항에 대하여 언급하지 전에, 간단한 Testbench를 다시 작성해 봅니다. A memory may be accessible via more than one address map. The UVM methodology enables engineers to quickly develop powerful,. This makes them more flexible, and able to work on a range of data types instead of just a single one. 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. `uvm_do (Item/Seq) This macro takes seq_item or sequence as argument. User classes derived directly from uvm_void inherit none of the UVM functionality, but such classes may be. The handle to the uvm_resource object is stored in two kinds of uvm_queues. Each resource has a set of scope. We’ll examine pyuvm’s implementation TLM 1. The uvm_object class is the base class for all UVM data and hierarchical classes. uvm_config_db#(TYPE)::set(this,"*. Macro. 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 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. The handle to the uvm_resource object is stored in two kinds of uvm_queues. 2-2020 standard. The call to the "uvm_root" static get method returns a reference to the top-level "uvm_root" object. We would like to show you a description here but the site won’t allow us. SNUG 2018 Page 6 SystemVerilog Virtual Classes, Methods, Interfaces Rev 1. 0a version of the standards document: “The goal is to allow stimulus and tests, including coverage and results checking, to be. uvm_comparer is the standalone class used to set a policy for doing comparisons and determines how miscompares are counted. 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. Improve this answer. uvm_transaction and uvm_component are also derived from uvm_object. print() routines you get what you expect. If no argument is specified (or an argument. ”. Some Standard Data Methods of the uvm_object Class By now you might think that these field macros are convenient but not efficient. Unlike the above three methods, this function takes three strings. 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. Even the uvm_object_registry and uvm_component_registry classes contain a lot of duplicated code that could have been refactored. A uvm_queue is created for every unique field_name. Testbench diagram. Some situations need assignment of. They are implemented separately from uvm_object so that users can plug in different ways to print, compare, etc. class uvm. The print method is used to deep print UVM object class properties in a well-formatted manner. 0 using simple producer/consumer examples. You always could use 'uvm_field_array_int and a pair of pack/unpack function that transforms the pixel info into an int (you would still have a byte of the int free) and the other way round. static function bit get(uvm_component cntxt, string inst_name, string field_name, inout T value, input uvm_object CALLING_CONTEXT = null, input string FILE = "", input int LINE = 0); With these additions every time we do a set, we remember where this set came from. 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. If you are using OVM/UVM then get_full_name() / get_name() will return the name of the component in the testbench hierarchy. essentially take the current global id then increment the counter. After the utility macro are the field automation macros in the form ‘uvm_field_*(data member, flag). `uvm_object_utils_begin. These macros are called by the corresponding uvm_*_utils macros, so you may only use them if you do. First, let's. UVM contains primarily 2 types of components i. It does a deep comparison. But that's another debate. To maintain uniformity in naming the components/objects, all the. UVM pre-defines six verbosity levels; UVM_NONE to UVM_DEBUG. Registration: While defining a class , its type has to be registered with the uvm factory. callback in uvm_sequence. Follow edited Apr 23, 2014 at 8:00. Try these examples yourself. When used as a base for user-defined RegModel test sequences, this class provides convenience methods for reading and writing registers and memories. SystemVerilog allows you to create modules and classes that are parameterized. We would like to show you a description here but the site won’t allow us. 02. the reason for this is that for IUS the m_inst_id is being set to the. class uvm_object; virtual function uvm_object clone ();. The uvm_object_registry serves as a lightweight proxy for a uvm_object of type T and type name Tname, a string. 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. T(semaphore)) semaphore_pool To get the handle of. uvm_object ¶. See Usage section below for information on using uvm_component_registry. They are distinct objects. The compare method returns 1 if comparison matches for the current object when it is compared with the R. wait_trigger_data. SNUG 2012 6 The OVM/UVM Factory & Factory OverridesThe UVM register layer acts similarly by modeling and abstracting registers of a design. How do we ensure that this Configuration class can easily be propagated across the testbench environment? In UVM, objects are often instantiated through the factory infrastructure. For Design specification and Verification plan, refer to Memory Model. The uvm_config_db class provides a convenience interface on top of the uvm_resource_db to simplify the basic interface used for uvm_component instances. In a previous article , print, do_print and use of automation macros to print were discussed. This enables us to monitor and record the transactions via the interface within this block. Jun 20, 2014 at 15:13. On calling `uvm_do () the above-defined 6 steps will be executed. UVM Questions: What is the difference between UVM creat…UVM consists of three main types of UVM classes, uvm_object; uvm_transaction; uvm_component; uvm_object. This improves flexibility and scalability of testbench. 1 Class Reference is a comprehensive document that describes the classes, methods, macros, and callbacks that constitute the UVM 1. Unfortunately this wont work yet because we have to register seq_item as follows `uvm_object_param_utils(seq_item#(A)). 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. For more efficient and more flexible implementation, we can use user definable do_*() hooks. event_object_h =. class tx_item extends uvm_sequence_item;. The user can simply apply a different. The uvm_object_registry serves as a lightweight proxy for a uvm_object of type T and type name Tname, a string. 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. It performs a deep copy. Unlike registers, memories are not mirrored because of the potentially large data space: tests that walk the entire memory space would negate any benefit from sparse memory modelling techniques. 1 Answer. Learn more about TeamsT – Object type where user-defined callback is used and it must be derived from uvm_object. Objects of this type will be used by sequences. 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. uvm_config_dbに渡すパラメータタイプはuvm_object_wrapperになります。これはuvm_config_dbにtypeを登録する場合の型です。 第一引数は通常はthisです。 第二引数は対象となるシーケンサのUVMの階層名+フェーズ名になります。From the application point of view, UVM Factory facilitates an object of one type to be substituted with an object of derived type without having to change the structure of the Testbench or modify the Testbench code. Blocking operationsPacking is just a way to convert your uvm_object into a bit array. Its primary role is to define a set of methods for such common operations as create , copy, compare, print, and record . In the case of UVM based System Verilog testbench, class objects can be created at any time during the simulation based on the requirement. These macros are used to start sequences and sequence items on default sequencer, m_sequencer. Follow. UVMFactory [source] ¶. 02. and a whole lot more!using EDA Playground VHDL Verilog/SystemVerilog UVM EasierUVM SVAUnit SVUnit VUnit TL-Verilog e + Verilog Python + Verilog Python Only C++/SystemC. Skills Needed: Students should have experience with object-oriented programming, C/C++, or. This article explains how to use a verbosity threshold to filter messages. Please see Register Abstraction for how each property is packed. Inline constraints (i. The UVM factory knows which component to create even if the component type is overridden. class my_test extends uvm_test uvm_table_printer m_printer; //. 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. It also becomes easier to connect to design regardless of the number of ports it has since that information is encapsulated in an interface. The compare method returns 1 if comparison matches for the current object when it is compared with the R. 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。. Use uvm_config_db# (uvm_object)::set. Read more: UVM Object [uvm_object] In my last post, I recommended that you give every SystemVerilog object either a unique ID or name. Static components & Dynamic components. OOP enables writing reusable code. e. 01 SystemVerilog Testbench 구조 01. Every component creates a logger stored in self. When set, metadata should be encoded as follows: For strings, pack an additional null byte after the string is packed. virtual function void print_object (string name, uvm_object value, byte scope_separator = ” . The function that is actually called depends on the context where the macro is used. Nested classes are fully supported by SystemVerilog. If you use the uvm_top. Welcome to EDAboard. We need to plan for it by structuring our code in certain ways. macro: Can be used, but try to avoid if you are. On calling `uvm_do () the above-defined 6 steps will be executed. The monitor captures values on the DUT's input and output pin. 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 allows for generic containers of objects to be created, similar to a void pointer in the C programming language. The UVM class library provides the basic building blocks for creating verification data and components. Note: The factory override ways are applicable for both uvm components and uvm objects. That means the other parameter Tname of. Object Overriding; UVM Phases; UVM Objections; UVM Object. Then you can do: typedef uvm_object_registry# (abc_test_seq,`STR (`SEQ_NAME (abc))) type_id;. UVMには、さまざまなオートメーション機能が実装さ. ” )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. As we saw earlier, the jelly_bean_transaction::type_id is a uvm_object_registry type. The first kind of queues store the handles to the uvm_resource objects that have the common field_name. First up, let’s briefly cover the semaphore and uvm_pool. See `uvm_object_utils and `uvm_component_utils for details. You should create a new macro that add quotes around it input argument. Both UVM Factories allow you to create objects, either the base type or a derived, without changing the call to create(). e. An appropriate `uvm_field_* macro is required to use based on the data type of class properties. 02. 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. path","label",value) (Adding other objects into the uvm_config_db is just as straightforward as adding a virtual interface. In the testcase where callbacks need to be applied, Declare and create an object of callback class in which methods are implemented (callback_1). Hence, it is required to have proper synchronization to avoid objects/components being called before they are created, The UVM phasing mechanism serves the purpose of synchronization. Gets the data, if any, provided by the last call to trigger. Using macros like `uvm_do , `uvm_create, `uvm_send etc; Using existing methods from the base class a. The UVM TLM library defines several abstract, transaction-level interfaces and the ports and exports that facilitate their use. This keeps your code base stable,. path","label",value) (Adding other objects into the uvm_config_db is just as straightforward as adding a virtual interface. This flexibility allows comprehensive testing of different configurations using a single, reusable testbench, significantly reducing development time and effort. Block abstraction base class. build_phase (phase) must be called in the. The register model can be used to read and write registers in the DUT, including signals connected to those registers. In Manufacturing, Casting is a process in which liquid metal is converted into the desired object. Aside from registering a class with the factory, we've seen that the. Does an abstract class (virtual class. An uvm_component inherits from. The packer determines how the packing. myagent. This method calls uvm_event_base::wait_trigger followed by get_trigger_data. uvm_env is extended from uvm_component and does not contain any extra functionality. That's it. Yes, the UVM create() method calls new() constructor on the object without any arguments (string name is not passed in there). 02. It allows for generic containers of objects to be created, similar to a void pointer in the C programming language. pyuvm is the Universal Verification Methodology implemented in Python instead of SystemVerilog. 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. The driver receives the item and drives it to the DUT through a virtual interface. A policy object can be passed along to set parameters like depth of comparison, verbosity, maximum number of. It is the base class for all UVM data and hierarchical classes. by The Art of Verification. 1-289-695-1969 shihua. is just the same as the previous two, you need to use them when your uvm_object or uvm_component has parameters. `uvm_object_param_utils. The do_pack() is used to pack each propery of the jelly_bean_transaction object using a uvm_packer policy object. pseudo code looks like this: class seq_item extends uvm_sequence_item; rand class_a a; rand class_b b; endclass// seq_item class class_a extends uvm_object; rand bit field_1; rand bit field_2; endclass//class_a class class_b. In a previous article, copy, do_copy and use of automation macros to print were discussed. Objections provide a facility for coordinating status information between two or more participating. We would like to show you a description here but the site won’t allow us. I did not register any class with the same name, unless the parent one which, I suppose, does not present any problem. There is often a need to copy, compare and print values in these classes. For example, if the knobs says we're in a certain mode, and the sequence shall be constrained according to the mode, then the knobs must be available at sequence pre/post/randomize(), it is too late to read them from a. This can be useful for peak and off-peak times. What is uvm_pool. The uvm_object_registry has static methods, which you call with the class::type_id::create () syntax. randomize() are the same method call. A function cannot have time controlled statements like @, #, fork join, or wait; A function cannot start a task since tasks are allowed to consume. The do_pack() method is called by the pack(), pack_bytes(), and pack_ints() methods. 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; //. uvm_config_db is a parameterized class that is parameterized with the data type of object that is being set or get. Divide the DB into smaller domains by grouping values into config objects. The uvm_object class is the base class for all UVM data and hierarchical classes. When the component (my_monitor) calls analysis_port. For example: `define STR (str) `"str`". print_topology() or factory. UVM also introduces a bunch of automation mechanisms for implementing print , copy , and compare objects and. ; The user-defined subscriber is derived from uvm_subscriber that must define the write method (A write method is a pure virtual method that is declared in the uvm_subscriber class). The packer determines how the packing.