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. So as I understood there are 3 main types of ports. Put-> Export->Imp; Analysis->Subscriber : producer transmit the data and other subscribers gets it. This can be useful for peak and off-peak times. The uvm_subscriber class only has a single analysis export. Declare driver, sequencer and monitor instance, 3. use the uvm_subscriber (essentially a component with a single port forwarding the call to the place you want) C) the *_decl macros the decl macros create a new class in the scope where you use the macros. pyuvm uses cocotb to interact with the simulator and schedule simulation events. 7. Description `uvm_register_cb(T, CB) Registers the user-defined callback which is extended from uvm_callback. This post will provide a simple tutorial on this new verification methodology. The analysis_export of the jelly-bean-functional-coverage subscriber (jb_fc_sub) is an object of the uvm_analysis_imp class specialized with the jelly_bean_transaction type. inherit from this base element a custom transaction where each derived type does have a custom member with your private type embedded. The events provide synchronization between processes by triggering an event from one process and waiting for that event in another process to be triggered. difficult indeed. If you want to use the fifo path, you need to create and connect a generic port in the driver class. uvm_subscriber creates an analysis_export with the correct parameterized type and links it to the write() function. UVM components connected through ports & exports Testbench driver (get-port configuration) Managing the virtual interface - config table - required dynamic casting Testbench sequencer (get-export configuration). medical, dental, behavioral health, etc. Python doesn’t have typing issues, so a programmer can create a subscriber by directly extending. By inheriting from uvm_object , these classes inherit the essential functionalities and properties discussed above, making it a crucial building block for UVM verification. 1. UVMを使用したクラスファイル群は「Verilog Header」として表. svh","path":"src/tutorial_32/agent. /easier_uvm_gen. Implementation ports shall be used to define the put. sv(47) @ 0: uvm_test_top. The uvm_tlm_if_base class is the base class of uvm_port_base class, which in turn is the base class of uvm_analysis_imp class (line 22). It is adenine parameterized class that handles merchant of select packet_c. uvm_driver is responsible for converted the sequence item(s) into "pin wiggles". Subscribers are basically listeners of an analysis port. When the driver unpacks the data it received from the sequencer, and drives DUT signals, it also. The uvm_subscriber class provides an analysis export that connects with the analysis port. government says 10 properties in Prince George should be forfeited for their alleged use in a years-long drug trafficking operation. Agent. Subscriber Exclusive:Airbnb listing is for 'Bull Moose Lodge': VT considers laws for short-term rentals. We would like to show you a description here but the site won’t allow us. uvm_subscriber ¶. (is also used as the base classfor calback classes in UVM, for example uvm_object. The print and sprint functions of uvm_object call the do_print. Ports shall be used to initiate and forward packets to the top layer of the hierarchy. connect() function. The analysis_export of the jelly-bean-functional-coverage subscriber (jb_fc_sub) is an object of the uvm_analysis_imp class specialized with the jelly_bean_transaction type. {"payload":{"allShortcutsEnabled":false,"fileTree":{"env":{"items":[{"name":"vsequences","path":"env/vsequences","contentType":"directory"},{"name":"ahb_coverage. The driver will extract necessary information from the data packet and toggle DUT ports via the virtual interface handle. 组件uvm_reg_predictor是uvm_subscriber的子类并且有一个可以用来接收来自目标监视器(target monitor)来的总线sequence解析端口(analysis implementation port)。它使用寄存器适配器(register adapter)来将进来的总线数据包转化为通用寄存器项，并且它在寄存器映射(register map)中查找地址. {"payload":{"allShortcutsEnabled":false,"fileTree":{"distrib/src/comps":{"items":[{"name":"uvm_agent. These new user defined configuration classes are recommended to be derived from uvm_object. Sequences can do operations on sequence items, or kick-off new sub-subsequences: Execute using the start () method of a sequence or `uvm_do macros. The uvm_component class is a base class for all UVM components. To check if all the valid combinations of inputs/stimulus were exercised. UVM also introduces a bunch of automation mechanisms for implementing print, copy, and compare objects and are defined using the field macros. The open structure, extensive automation, and standard transaction-level interfaces of UVM make it suitable for building functional verification environments ranging from simple block-level tests to the most complex coverage-driven testbenches. Viewed 574 times. These macros are used to start sequences and sequence items on default sequencer, m_sequencer. /uwe Quote uvm_component_utils () is used to register a class as a UVM component, which is a unit of functionality that can be instantiated and used within a UVM testbench. TLM Analysis TesetBench Components are, Implementing analysis port in comp_a. sv. sv" endclass `include "clkndata_cover_inc_after. We would like to show you a description here but the site won’t allow us. The UVM 1. Components such as checkers are often derived from the UVM_subscriber class. comp_b [component_b] Printing trans, ----- Name Type Size Value ----- trans transaction - @209 addr integral 4 'he wr_rd integral 1 'h0 wdata integral 8 'h4 ----- UVM_INFO component_b. svh","path":"projects/ahb2_uvm_tb/ahb_env/ahb. Note that config_db should be. svh","path":"tb/UVM/tb_classes/async_fifo_base_test. svh","path":"tb/UVM/tb_classes/async_fifo_base_test. SystemVerilog. 286 class transition_coverage_collector extends uvm_subscriber # (transaction); 287 `uvm_component_utils (transition_coverage_collector) 288In higher id, add_coverage class is defined and extended from uvm_subscriber class. e. {"payload":{"allShortcutsEnabled":false,"fileTree":{"":{"items":[{"name":"README. The uvm_comparer adds up policy for the comparison and. ,Dear UVM Subscriber, Thank you for using UVM, We always want to improve our services - and provide you with the best e-mailing experience possible to Improved Email Security, such as Antivirus, Spam and Phishing filters. So we can take advantage of this and connect it with the pkt_mon analysis port. . 其代码如下：. subscriber是消费，用户的意思 uvm_subscriber主要作为coverage的收集方式之一 uvm_subscriber的代码非常简单，继承于uvm_component，再加上一个analysis export而已。 其代码如下： virtual class uvm_subscribThe UVM configuration database accessed by the class uvm_config_db is a great way to pass different objects between multiple testbench components. It is recommended to extend uvm_sequencer base class since it contains all of the functionality required to allow a sequence to communicate with a driver. Doing TDD of the coverage class is the point where I exceeded what I thought was reasonable with SVUnit. UVM Tutorial for Candy Lovers – 8. The uvm_driver class is a parameterized class of type REQ sequence_item and RSP sequence item. Bases:. log","contentType":"file"},{"name":"README. The line 4 constrains the num_jelly_beans to be between 2 and 4. Analysis Port Multi Imp port. Verification of register behavior can include testing different access scenarios, checking field values after resets, verifying register side-effects, and more. uvm_subscriber creates an. d","contentType":"file"},{"name":"uvm. This. uvm driver is a component that initiate requests for new transactions and drives it to lower level components. 6e. md","path":"README. you create a proxy using the uvm_subscriber(or similar). UVM Subscriber : Could have functional coverage groups and coverpoints in a subscriber and have that sampled whenever it receives an object from the agent. Continue reading. 1. 0 Ports, Exports and Imps; TLM-2. The way it is depicted in the example and in some other examples on the net: You call uvm_reg::include_coverage ("*", UVM_CVR_ALL) in the env. The utility macros help to register each object with the factory. {"payload":{"allShortcutsEnabled":false,"fileTree":{"src/tutorial_32":{"items":[{"name":"agent. We would like to show you a description here but the site won’t allow us. . pyuvm uses cocotb to interact with the simulator and schedule simulation events. Implementing analysis imp_port’s in comp_b. Now let’s create the multiple jelly beans of the same flavor. 2 Class Reference, but is not the only way. Email with a Subject of "Dear subscriber" is a phishing scam-- an attempt to steal your UVM credentials (your Net-ID and password). To actually start the test, a task called run_test is called from the initial block in your top-level module. new: Creates and initializes an instance of this class using the normal constructor arguments for uvm_component: name is the name of the instance, and parent is the handle to the hierarchical parent, if any. ius","path":"Part_1/uvm_core_utilities/run/Makefile. sv(68) @ 0: uvm_test_top. sv(37) @ 0: uvm_test_top. The perl script easier_uvm_gen. 0; TLM-2. md","contentType":"file"},{"name":"mux. Example 5 ‐ Partial uvm_subscriber code 18. d","path":"src/uvm/comps/package. This will trigger up the UVM testbench. UVM Environment An environment provides a well-mannered hierarchy and container for agents, scoreboards, and other verification components including other environment classes that are helpful in reusing block-level environment components at the SoC level. get_inst_coverage (), t. sv(37) @ 0: uvm_test_top. Analysis Export. . The events provide synchronization between processes by triggering an event from one process and waiting for that event in another process to be triggered. Some insurers may go along with. This is usually used to configure the agent to be either active/passive. 0; TLM-2. 1 reference manual. The sequence_item(s) are provided by one uvm_sequence objects. 08 Scoreboard and Coverage. An export is a waypoint; it can only be connected to another export or imp . It uses a TLM analysis port to broadcast transactions. A uvm_component does not have a built-in analysis port while a uvm_subscriber is an extended version with a built-in analysis implementation port named as analysis_export. The compare() method compares two objects to return 1 in case of successful comparison. uvm_subscriber. October 30: Last Day to Withdraw. class UVMSubscriber (UVMComponent): # (type T=int) extends uvm_component """ This class provides an analysis export for receiving transactions from a connected analysis export. sv" We would like to show you a description here but the site won’t allow us. Create a user-defined test class extended from uvm_test and register it in the factory. Also, we can instantiate as many covergroups as we may need. The record function of uvm_object calls the do_record. uvm_object is the one of the base classes from where almost all UVM classes are derived. focusing on AXI, OCP, or other system buses in existence, this tutorial will be based on the hypothetical. write (), it basically cycles through. Expected values can be either golden reference values or generated from the. 2 User’s Guide. The Subscriber Text File you will upload to LISTSERV must be ordered “e-mail address, space, the subscriber’s first name, space, and the subscriber’s last name” For. `uvm_do (Item/Seq) This macro takes seq_item or sequence as argument. class add_coverage extends uvm_subscriber # (packet_c) uvm_subscriber creates an analysis_export with the correct parameterized type and links it to the write() function. Graduation Information. The uvm_subscriber. We would like to show you a description here but the site won’t allow us. TLM Analysis TesetBench Components are, Implementing analysis port in comp_a. {"payload":{"allShortcutsEnabled":false,"fileTree":{"src/uvm/comps":{"items":[{"name":"package. 3. UVM subscriber (uvm_subscriber) is a base component class of UVM with a built in analysis_port named as analysis_export which provides the access to the write method for receiving transactions. A UVM Testbench for Analog Verification: A Programmable Filter Example Charles Dančak Betasoft Consulting, Inc. Pages 183 ; Ratings 100% (1) 1 out of 1 people found this document helpful; This preview shows page 101 - 104 out of 183 pages. d","path":"src/uvm/comps/package. The monitor captures values on the DUT's input and output pin. {"payload":{"allShortcutsEnabled":false,"fileTree":{"15_Talking_Objects/02_With_Analysis_Port":{"items":[{"name":"average. uvm_active_passive_enum is a UVM enum declaration that stores UVM_ACTIVE or UVM_PASSIVE. Already have an account? UVM example code. User classes derived directly from uvm_void inherit none of the UVM functionality, but. {"payload":{"allShortcutsEnabled":false,"fileTree":{"":{"items":[{"name":"apb_uvm","path":"apb_uvm","contentType":"directory"},{"name":"compile","path":"compile. UVM_INFO testbench. This example shows connecting the same. But I already have the write function for the analysis port defined with _imp. ion_cal tback. But I already have the write function for the analysis port defined with _imp. It is usually called in the initial block from the top-level testbench module. This task either takes the test name as a string argument or more commonly, you specify the test name on the command line with UVM_TESTNAME. UVM Factory Override. An example of what. 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. Verification of register behavior can include testing different access scenarios, checking field values after resets, verifying register side-effects, and more. svh","contentType":"file. . As you mentioned, the jelly_bean_sb_subscriber and the jelly_bean_scoreboard each need a handle to the other. Put-> get : producer put data and consumer gets the data. This class provides an analysis export for receiving transactions from a connected analysis export. All the signals listed as the module ports belong to APB specification. pyuvm does not need uvm_subscriber. Multiple uvm_analysis_port can be connected to a single uvm_analysis_imp or uvm_analysis_export. Minimal example with register sequence and register blockMacros. 1 to create reusable and portable testbenches. this works even when you object do not derive from ovm_object. uvm_active_passive_enum is a UVM enum declaration that stores UVM_ACTIVE or UVM_PASSIVE. mode can take 16 values, while key can take 4 values. Typically configuration classes and data objects are derived from this class and are passed to different testbench components during the course of a simulation. You do not have one. Richard Pursehouse Richard Pursehouse. t system verilog version of uvm. 2 FIX 12 kHz 52 mV. uvm_analysis_imp 's are the subscriber, they receive transactions and call a function named 'write' in the class in which they are defined. {"payload":{"allShortcutsEnabled":false,"fileTree":{"tb/agents/apb_mstr_agent":{"items":[{"name":"apb_agent_pkg. T – Object type where user-defined callback is used and it must be derived from uvm_object. This is implemented in derived classes. Overview. uvm_subscriber. The new Interconnect design block consists of combination of different communication protocols as shown in Fig. An export is a waypoint; it can only be connected to. UVM factory is a mechanism to improve flexibility and scalability of the testbench by allowing the user to substitute an existing class object by any of its inherited child class objects. . A: Subscribers receive transactions from monitors (sent over an "analysis_port"). sv(30) @ 0: uvm_test_top. H. svh","contentType":"file. {"payload":{"allShortcutsEnabled":false,"fileTree":{"":{"items":[{"name":"LICENSE","path":"LICENSE","contentType":"file"},{"name":"README. class mem_scoreboard extends uvm_scoreboard; `uvm_component_utils (mem_scoreboard) // new - constructor function new (string name, uvm_component parent); super. Uvm components, uvm env and uvm test are the three main building blocks of a testbench in uvm based verification. uvm_subscriber already has analysis_export so that it can directly receive transactions from the connected. . my previous implementation was creating uvm_analysis_imp handles which I was connecting with the uvm_analysis_port. class clkndata_coverage extends uvm_subscriber #(data_tx); `uvm_component_utils(clkndata_coverage) bit m_is_covered; data_tx m_item;. preview shows page 101 - 104 out of 183 pages. {"payload":{"allShortcutsEnabled":false,"fileTree":{"tb":{"items":[{"name":"axi_agent. pyuvm implements the most often-used parts of the UVM while taking advantage of the fact that Python does not have strict typing and does not require parameterized classes. This paper explains UVM analysis port usage and compares the functionality to subscriber satellite TV. Collected data is exported via an analysis port. The uvm_scoreboard is an extension of uvm component without adding capabilities. Single uvm_analysis_port can have a connection with uvm_analysis_imp or uvm_analysis_export. This class provides an analysis export for receiving transactions from a connected analysis export. Using wait_for_grant(), send_request(), wait_for_item_done() etc b. S. Depending on Agent type, create agent components in the build phase, driver and sequencer will be created only for the active agent. Minimal example with register sequence and register blockWe would like to show you a description here but the site won’t allow us. For this purpose, the factory needs to know all the types of classes created within the testbench by a process called as registration. 282 cg. In essense, the uvm_subscriber class is a component with a built-in analysis export. {"payload":{"allShortcutsEnabled":false,"fileTree":{"distrib/src/comps":{"items":[{"name":"uvm_agent. svh","contentType":"file"},{"name. static function void set (. The uvm_subscriber base component can be used to simplify this operation, so a typical analysis component would extend uvm_subscriber as: class sub1 #(type T = simple_trans) extends uvm_subscriber #(T);. 2 Class Reference is independent of any specific design processes and is complete for the construction ofTypically, coverage collectors are UVM subscribers that are connected to monitors. In a previous article, copy, do_copy and use of automation macros to print were discussed. pyuvm is the Universal Verification Methodology implemented in Python instead of SystemVerilog. v","path":"mux. Hi Peter, Thank you for you answer. pyuvm does not need uvm_subscriber. uvm_subscriber; uvm_test; TLM Implementation Declaration Macros; TLM-1 Interfaces; TLM-1. p_sequencer is defined using the macro `uvm_declare_p_sequencer (SEQUENCER_NAME){"payload":{"allShortcutsEnabled":false,"fileTree":{"projects/ahb2_uvm_tb/ahb_env":{"items":[{"name":"ahb_coverage. Multi Subscribers with Multiports. Create a custom class inherited from uvm_env, register with factory, and call new. The document covers the UVM 1. Create a user-defined test class extended from uvm_test and register it in the factory. module traffic ( input pclk, input presetn, input [31:0] paddr, input [31:0] pwdata. It is intended for verification engineers who want to use UVM 1. Immediate assertion can be used directly inside class based UVM components like uvm_test, scoreboard and monitors. The uvm_tlm_if_base class is the base class of uvm_port_base class, which in turn is the base class of uvm_analysis_imp class (line 22). You can sample your coverage data anywhere in your verification environment, including uvm_monitor or uvm_subscriber. UVM Tutorial for Candy Lovers – 1. do' file which compiles and executes the tests. env_o. This brings about. {"payload":{"allShortcutsEnabled":false,"fileTree":{"tb/UVM/tb_classes":{"items":[{"name":"async_fifo_base_test. svh","path":"15_Talking_Objects/02_With. The idea behind UVM is to enhance flexibility and reuse code so that the same testbench can be configured in different ways to build different components, and provide different stimulus. UVM is built on top of the SystemVerilog language and provides a framework for creating modular, reusable testbench components that can be easily integrated. The analysis_export of the jelly-bean-functional-coverage subscriber (jb_fc_sub) is an object of the uvm_analysis_imp class specialized with the jelly_bean_transaction type. The uvm_*_export classes are used to connect the uvm_*_imp of enclosed component to the enclosing component. The variable is_active can be set either at environment level or via a. If you're familiar with SystemC, an imp port doesn't have a direct equivalent. UVM is based on Open Verification Methodology (OVM) and Verification Methodology Manual (VVM). The run_test() method is required to call from the static part of the testbench. It allows for generic containers of objects to be created, similar to a void pointer in the C programming language. As usual the code compiles w/o error, and functions if I remove the port code. md","path":"README. Meteorology. Using get () and put () In the previous article, we saw how a UVM driver gets the next item by the calling get_next_item method, and how it informs the sequencer that the current item is done. faculty and students at UVM studying Ecology, Evolution, or Environmental Biology. Uvm_env. 1 Answer. SystemVerilog 1800-2009 reserved the keyword checker as an encapsulation block for building verification libraries of assertions along with modeling code for formal verification. 02. 1、声明 analysis port 变量, 然后定义待传输数据的类型. 1. 2 Answers. The UVM scoreboard is a component that checks the functionality of the DUT. All examples were tested with Questa 10. env_o. An agent is written by extending UVM_agent, 2. 2 Design of Interconnect Block. inherit from this base element a custom transaction where each derived type does have a custom member with your private type embedded. UVM example code. RSP sequence item is optional. Collected data can be used for protocol checking and coverage. I think the idea of separating the UVC monitor and the coverage by encapsulating the coverage groups within a uvm_subscriber is neat, however I can foresee that the example of the coverage library (lpcm_cov_lib. uvm_component クラス定義 virtual class uvm_component extends uvm_report_object 生成メソッド new ( string name, uvm_component parent ) 階層メソッド get_parent get_full_name get_children, get_child, get_next_child, get_first_child get_num_children, has_child function uvm_component lookup ( string name ) function intLifeline is the FCC's program to help make communications services more affordable for low-income consumers. Instantiations of UVM classes will use the same suffixes as mandated by 1. The compare method returns 1 if comparison matches for the current object when it is compared with the R. 1. This UVM Class Reference provides detailed reference information for each user-visible class in the UVM library. 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. As a subscriber to this list, you will receive a regular newsletter regarding Employee Wellness opportunities and initiatives. // instance, and ~parent~ is the handle to the hierarchical parent, if any. The UVM monitor functionality should be limited to basic monitoring that is. Last Updated: April 4, 2014 Accellera’s recently released UVM may change the future of verification, as verification methodology seems to be consolidated in this UVM. Our engineer inspected the roof and. For example, write and read values from a RW register should match. UVM scoreboard is a verification component that contains checkers and verifies the functionality of a design. It is to do with verbosity. env_o. uvm_env is used to create and connect the uvm_components like driver, monitors , sequeners etc. The type of the analysis_export of the uvm_subscriber is actually uvm_analysis_imp. Participating Insurance Plans at the UVM Medical Center: Please Note: The below is a list of insurers contracted with The University of Vermont Medical Center, but it does not guarantee participation of your specific insurance plan or coverage of your planned service (i. So UVM phases act as a synchronizing mechanism in. virtual task start ( uvm_sequencer_base sequencer, uvm_sequence_base parent_sequence = null, int this_priority = -1; bit call_pre_post = 1; Arguments Descriptionmodule uvm_first_ex; import uvm_pkg::*; `include "uvm_macros. Note that you had spawned seq2 towards the end of seq1. 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. uvm_subscriber is an extension of uvm_component with a built-in analysis_export. 5. The typedef (the first line) of the jelly_bean_sb_subscriber provides a forward declaration for the. Example 5 ‐ Partial uvm_subscriber code 18. The default implementations return 1, which allows the report to be processed. Create a custom class inherited from uvm_test, register it with factory and call function new. 1d, an abstract uvm_event_base class does not exist. comps. medlib-l@list. . Collected data can be used for protocol checking and coverage. These are some of the most commonly used methods in uvm_reg_field. The broadcaster here is the analysis_port. When the register is created, the build_coverage should be called. svh","path":"21_UVM_Transactions/tb_classes/add_test. For testbench hierarchy, base class components are. py","path":"src/uvm/comps/__init__. The monitor simply observes the transactions happening across the interface signals. 16 We use the uvmenv class to hold the structure of the testbench then we use from DCAE 001 at Politehnica University BucharestOnce the connection is made, the driver can utilize API calls in the TLM port definitions to receive sequence items from the sequencer. Using macros like `uvm_do , `uvm_create, `uvm_send etc; Using existing methods from the base class a. use uvm_subscriber to create a container around the port type you want. Thus, this class provides an analysis export for receiving transactions from a connected analysis export. subscriber components that observe transactions from exactly one analysis port. g. No errors will be reported. The base class is parameterized by the request and response item types that can be handled by the. SystemVerilog Coverage bins options examples Functional CoverageCross Coverage Coverage Options Coverage Functional Coverage Cross Coverage Coverage OptionsIf you are using UVM, uvm_subscriber is a SystemVerilog example of an abstract class (where the write function must be implemented in extended classes). Creating a Subscriber Text File. uvm_subscriber; This class provides an analysis export for receiving transactions from a connected analysis export. See what happens behind the scenes when start_item and finish_item is called. If you lower the verbosity to UVM_MEDIUM, it gets printed: function void mem_cov::report_phase (uvm_phase phase); `uvm_info (get_full_name. We defined a function called check_taste_in_c which takes the flavor, sour, and taste as arguments and returns 0 if the combination is as expected. Please refer to the UVM reference manual. 3. UVM Tutorial for Candy Lovers – 23. It is optional, but unless it is specified, no recording takes place. We would like to show you a description here but the site won’t allow us. It is recommended to extend uvm_sequencer base class since it contains all of the functionality required to allow a sequence to communicate with a driver. this works even when you object do not derive from ovm_object. In this scheme, data is represented as transactions (class objects that contain random, protocol specific information) which flow in and out of different components via special ports called TLM interfaces. They are called only if the UVM_CALL_HOOK bit is specified in the action associated with the report. UVM中内建了uvm_subscriber类，可以被当作观察者或者订阅者使用。 一般用在构建功能覆盖率的收集。伪代码如下： 订阅者订阅monitor中收集到的transaction，覆盖率模块，参考模型，scoreboard都是订阅者。A Scoreboard is a checker element that keeps a tally on the input stimulus, and the expected output. How to execute sequences via start ( ) virtual task start ( uvm_sequencer_base sequencer, uvm_sequence_base parent_sequence = null, int this_priority = -1, bit call_pre_post = 1 ); Note that you have to always pass the handle to a sequencer which should execute this sequence, whereas the other arguments are optional. So UVM phases act as a synchronizing mechanism in the life cycle of a simulation. The following. UVM Tutorial for Candy Lovers – 1. The analysis implementation is the write function. 1) In uvm_scoreboard, we can define & initialize analysis_export to implement write function. class scoreboard extends uvm_component; `uvm_component_utils(scoreboard). comp_b [component_b] Printing trans, ----- Name Type Size Value ----- trans transaction - @209 addr integral 4 'he wr_rd integral 1 'h0 wdata integral 8 'h4 ----- UVM_INFO component_b.