{"id":10277,"date":"2026-10-08T08:12:00","date_gmt":"2026-10-08T08:12:00","guid":{"rendered":"https:\/\/inskill.in\/training\/?p=10277"},"modified":"2026-10-09T11:48:31","modified_gmt":"2026-10-09T11:48:31","slug":"uvm-coding-interview-questions-practical-examples","status":"publish","type":"post","link":"https:\/\/inskill.in\/training\/vlsi\/uvm-coding-interview-questions-practical-examples\/","title":{"rendered":"UVM Coding Interview Questions With Practical Examples"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"10277\" class=\"elementor elementor-10277\">\n\t\t\t\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-becba74 elementor-section-boxed elementor-section-height-default elementor-section-height-default wpr-particle-no wpr-jarallax-no wpr-parallax-no wpr-sticky-section-no\" data-id=\"becba74\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-7fdec00\" data-id=\"7fdec00\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t\t\t<div class=\"elementor-element elementor-element-905f15f elementor-widget elementor-widget-text-editor\" data-id=\"905f15f\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<style>\/*! elementor - v3.11.2 - 22-02-2023 *\/\n.elementor-widget-text-editor.elementor-drop-cap-view-stacked .elementor-drop-cap{background-color:#818a91;color:#fff}.elementor-widget-text-editor.elementor-drop-cap-view-framed .elementor-drop-cap{color:#818a91;border:3px solid;background-color:transparent}.elementor-widget-text-editor:not(.elementor-drop-cap-view-default) .elementor-drop-cap{margin-top:8px}.elementor-widget-text-editor:not(.elementor-drop-cap-view-default) .elementor-drop-cap-letter{width:1em;height:1em}.elementor-widget-text-editor .elementor-drop-cap{float:left;text-align:center;line-height:1;font-size:50px}.elementor-widget-text-editor .elementor-drop-cap-letter{display:inline-block}<\/style>\t\t\t\t<p><span style=\"font-weight: 400;\">UVM (Universal Verification Methodology) interviews often go beyond definitions such as sequence, sequencer, driver, and monitor. Interviewers may ask you to write a transaction class, implement a sequence, connect a monitor to a scoreboard, debug a configuration failure, or explain why a test ends before all transactions are processed.<\/span><\/p><p><span style=\"font-weight: 400;\">For functional verification engineers, the goal is to demonstrate that you understand how UVM components work together in a reusable testbench\u2014not simply that you can remember class names and macros.<\/span><\/p><p><span style=\"font-weight: 400;\">This guide covers practical UVM coding interview questions with SystemVerilog examples, common coding mistakes, and follow-up questions relevant to VLSI verification interviews. Here are the concepts covered in <\/span><a href=\"https:\/\/vlsiguru.com\/blog\/uvm-interview-preparation\"><span style=\"font-weight: 400;\">UVM interview preparation material<\/span><\/a><span style=\"font-weight: 400;\">.<\/span><\/p><h3><span style=\"font-weight: 400;\">1. How do you write a UVM sequence item?<\/span><\/h3><p><span style=\"font-weight: 400;\">A sequence item represents an individual transaction that a verification environment sends to the DUT through a driver. For example, a simple bus transaction may contain an address, data, and a read\/write control field.<\/span><\/p><p><span style=\"font-weight: 400;\">class bus_item extends uvm_sequence_item;<\/span><\/p><p>\u00a0<\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0rand bit [7:0]\u00a0 addr;<\/span><\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0rand bit [31:0] data;<\/span><\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0rand bit\u00a0 \u00a0 \u00a0 \u00a0 write;<\/span><\/p><p>\u00a0<\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0`uvm_object_utils(bus_item)<\/span><\/p><p>\u00a0<\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0function new(string name = &#8220;bus_item&#8221;);<\/span><\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0super.new(name);<\/span><\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0endfunction<\/span><\/p><p>\u00a0<\/p><p><span style=\"font-weight: 400;\">endclass<\/span><\/p><p>\u00a0<\/p><p><span style=\"font-weight: 400;\">The class extends <\/span><span style=\"font-weight: 400;\">uvm_sequence_item<\/span><span style=\"font-weight: 400;\">, while <\/span><span style=\"font-weight: 400;\">rand<\/span><span style=\"font-weight: 400;\"> allows the fields to be randomized. The factory registration macro makes the class available for factory-based creation.<\/span><\/p><p><b>Likely follow-up:<\/b><span style=\"font-weight: 400;\"> Why use <\/span><span style=\"font-weight: 400;\">uvm_sequence_item<\/span><span style=\"font-weight: 400;\"> instead of <\/span><span style=\"font-weight: 400;\">uvm_component<\/span><span style=\"font-weight: 400;\">?<\/span><\/p><p><span style=\"font-weight: 400;\">A sequence item represents transaction data and does not participate in the UVM component hierarchy. A driver, monitor, agent, or environment is a component because it participates in that hierarchy.<\/span><\/p><h3><span style=\"font-weight: 400;\">2. How do you write a sequence that generates multiple transactions?<\/span><\/h3><p><span style=\"font-weight: 400;\">A sequence defines the stimulus scenario by creating and sending one or more sequence items to a sequencer.<\/span><\/p><p><span style=\"font-weight: 400;\">class bus_sequence extends uvm_sequence #(bus_item);<\/span><\/p><p>\u00a0<\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0`uvm_object_utils(bus_sequence)<\/span><\/p><p>\u00a0<\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0function new(string name = &#8220;bus_sequence&#8221;);<\/span><\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0super.new(name);<\/span><\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0endfunction<\/span><\/p><p>\u00a0<\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0task body();<\/span><\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0bus_item req;<\/span><\/p><p>\u00a0<\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0repeat (10) begin<\/span><\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0req = bus_item::type_id::create(&#8220;req&#8221;);<\/span><\/p><p>\u00a0<\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0start_item(req);<\/span><\/p><p>\u00a0<\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0if (!req.randomize())<\/span><\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0`uvm_fatal(&#8220;RAND&#8221;, &#8220;Randomization failed&#8221;)<\/span><\/p><p>\u00a0<\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0finish_item(req);<\/span><\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0end<\/span><\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0endtask<\/span><\/p><p>\u00a0<\/p><p><span style=\"font-weight: 400;\">endclass<\/span><\/p><p>\u00a0<\/p><p><span style=\"font-weight: 400;\">Here, the sequence generates ten randomized transactions. <\/span><span style=\"font-weight: 400;\">start_item()<\/span><span style=\"font-weight: 400;\"> and <\/span><span style=\"font-weight: 400;\">finish_item()<\/span><span style=\"font-weight: 400;\"> participate in the sequence-to-sequencer handshake.<\/span><\/p><p><b>Likely follow-up:<\/b><span style=\"font-weight: 400;\"> What happens if <\/span><span style=\"font-weight: 400;\">randomize()<\/span><span style=\"font-weight: 400;\"> fails?<\/span><\/p><p><span style=\"font-weight: 400;\">The sequence should not silently continue with invalid or unintended stimulus. Check the return value and investigate contradictory constraints or other randomization problems.<\/span><\/p><h3><span style=\"font-weight: 400;\">3. How does a UVM driver receive and process a transaction?<\/span><\/h3><p><span style=\"font-weight: 400;\">A driver receives transaction-level requests and converts them into pin-level activity on the DUT interface.<\/span><\/p><p><span style=\"font-weight: 400;\">For this example, assume a simplified interface with <\/span><span style=\"font-weight: 400;\">valid<\/span><span style=\"font-weight: 400;\">, <\/span><span style=\"font-weight: 400;\">ready<\/span><span style=\"font-weight: 400;\">, <\/span><span style=\"font-weight: 400;\">addr<\/span><span style=\"font-weight: 400;\">, and <\/span><span style=\"font-weight: 400;\">data<\/span><span style=\"font-weight: 400;\"> signals.<\/span><\/p><p><span style=\"font-weight: 400;\">class bus_driver extends uvm_driver #(bus_item);<\/span><\/p><p>\u00a0<\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0`uvm_component_utils(bus_driver)<\/span><\/p><p>\u00a0<\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0virtual bus_if vif;<\/span><\/p><p>\u00a0<\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0function new(string name, uvm_component parent);<\/span><\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0super.new(name, parent);<\/span><\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0endfunction<\/span><\/p><p>\u00a0<\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0task run_phase(uvm_phase phase);<\/span><\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0bus_item req;<\/span><\/p><p>\u00a0<\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0forever begin<\/span><\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0seq_item_port.get_next_item(req);<\/span><\/p><p>\u00a0<\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/ Drive transaction fields using vif.<\/span><\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/ Wait for the protocol&#8217;s completion condition.<\/span><\/p><p>\u00a0<\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0seq_item_port.item_done();<\/span><\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0end<\/span><\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0endtask<\/span><\/p><p>\u00a0<\/p><p><span style=\"font-weight: 400;\">endclass<\/span><\/p><p>\u00a0<\/p><p><span style=\"font-weight: 400;\">The omitted interface-driving logic depends on the actual protocol. A production driver must drive the correct signals, handle reset, wait for the required handshake, and avoid completing a transaction prematurely.<\/span><\/p><p><b>Likely follow-up:<\/b><span style=\"font-weight: 400;\"> What is the difference between <\/span><span style=\"font-weight: 400;\">get_next_item()<\/span><span style=\"font-weight: 400;\"> and <\/span><span style=\"font-weight: 400;\">get()<\/span><span style=\"font-weight: 400;\">?<\/span><\/p><p><span style=\"font-weight: 400;\">With <\/span><span style=\"font-weight: 400;\">get_next_item()<\/span><span style=\"font-weight: 400;\">, the driver explicitly calls <\/span><span style=\"font-weight: 400;\">item_done()<\/span><span style=\"font-weight: 400;\"> when it finishes processing the request. With <\/span><span style=\"font-weight: 400;\">get()<\/span><span style=\"font-weight: 400;\">, the item retrieval operation includes completion of the request handshake. The choice depends on the driver&#8217;s transaction-processing requirements.<\/span><\/p><h3><span style=\"font-weight: 400;\">4. How do you implement a monitor and publish transactions?<\/span><\/h3><p><span style=\"font-weight: 400;\">A monitor observes DUT activity and converts sampled signals into transaction objects. It should not drive the DUT.<\/span><\/p><p><span style=\"font-weight: 400;\">class bus_monitor extends uvm_monitor;<\/span><\/p><p>\u00a0<\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0`uvm_component_utils(bus_monitor)<\/span><\/p><p>\u00a0<\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0uvm_analysis_port #(bus_item) ap;<\/span><\/p><p>\u00a0<\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0function new(string name, uvm_component parent);<\/span><\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0super.new(name, parent);<\/span><\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0ap = new(&#8220;ap&#8221;, this);<\/span><\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0endfunction<\/span><\/p><p>\u00a0<\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0\/\/ In the sampling task:<\/span><\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0\/\/ 1. Observe the protocol handshake.<\/span><\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0\/\/ 2. Create a bus_item.<\/span><\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0\/\/ 3. Populate the observed fields.<\/span><\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0\/\/ 4. Publish the transaction with ap.write(item).<\/span><\/p><p>\u00a0<\/p><p><span style=\"font-weight: 400;\">endclass<\/span><\/p><p>\u00a0<\/p><p><span style=\"font-weight: 400;\">The analysis port allows the monitor to publish transactions to a scoreboard, coverage collector, or other subscribers without knowing their internal implementation.<\/span><\/p><p><b>Likely follow-up:<\/b><span style=\"font-weight: 400;\"> Why should the monitor avoid modifying a transaction after publishing it?<\/span><\/p><p><span style=\"font-weight: 400;\">Subscribers may retain the object handle. Modifying the same object for another transaction can cause consumers to observe changed data unexpectedly. Creating a fresh object for each sampled transaction is a straightforward way to avoid this problem.<\/span><\/p><h3><span style=\"font-weight: 400;\">5. How do you connect a monitor to a scoreboard?<\/span><\/h3><p><span style=\"font-weight: 400;\">A scoreboard checks observed behavior against expected behavior. UVM analysis communication lets the monitor and scoreboard remain independent.<\/span><\/p><p><span style=\"font-weight: 400;\">A simplified scoreboard can receive transactions using an analysis implementation:<\/span><\/p><p><span style=\"font-weight: 400;\">class bus_scoreboard extends uvm_scoreboard;<\/span><\/p><p>\u00a0<\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0`uvm_component_utils(bus_scoreboard)<\/span><\/p><p>\u00a0<\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0uvm_analysis_imp #(bus_item, bus_scoreboard) analysis_export;<\/span><\/p><p>\u00a0<\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0function new(string name, uvm_component parent);<\/span><\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0super.new(name, parent);<\/span><\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0analysis_export = new(&#8220;analysis_export&#8221;, this);<\/span><\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0endfunction<\/span><\/p><p>\u00a0<\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0function void write(bus_item item);<\/span><\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0`uvm_info(&#8220;SB&#8221;,<\/span><\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0$sformatf(&#8220;Observed addr=%0h data=%0h&#8221;,<\/span><\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0item.addr, item.data),<\/span><\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0UVM_MEDIUM)<\/span><\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0endfunction<\/span><\/p><p>\u00a0<\/p><p><span style=\"font-weight: 400;\">endclass<\/span><\/p><p>\u00a0<\/p><p><span style=\"font-weight: 400;\">In the environment&#8217;s <\/span><span style=\"font-weight: 400;\">connect_phase<\/span><span style=\"font-weight: 400;\">, connect the monitor&#8217;s analysis port to the scoreboard&#8217;s implementation:<\/span><\/p><p><span style=\"font-weight: 400;\">monitor.ap.connect(scoreboard.analysis_export);<\/span><\/p><p>\u00a0<\/p><p><span style=\"font-weight: 400;\">The example logs observed transactions. A functional scoreboard must also obtain expected results and compare them with the observed results.<\/span><\/p><p><b>Likely follow-up:<\/b><span style=\"font-weight: 400;\"> The monitor detects transactions, but the scoreboard receives none. What would you check?<\/span><\/p><p><span style=\"font-weight: 400;\">Confirm that <\/span><span style=\"font-weight: 400;\">ap.write()<\/span><span style=\"font-weight: 400;\"> is reached, the analysis port is constructed, the connection is made in <\/span><span style=\"font-weight: 400;\">connect_phase<\/span><span style=\"font-weight: 400;\">, and the producer and consumer use compatible transaction types.<\/span><\/p><h3><span style=\"font-weight: 400;\">6. What is the difference between <\/span><span style=\"font-weight: 400;\">uvm_object<\/span><span style=\"font-weight: 400;\"> and <\/span><span style=\"font-weight: 400;\">uvm_component<\/span><span style=\"font-weight: 400;\">?<\/span><\/h3><p><span style=\"font-weight: 400;\">This question checks whether you understand the basic UVM class hierarchy.<\/span><\/p><table><tbody><tr><td><p><b>uvm_object<\/b><\/p><\/td><td><p><b>uvm_component<\/b><\/p><\/td><\/tr><tr><td><p><span style=\"font-weight: 400;\">Used for data objects and sequences<\/span><\/p><\/td><td><p><span style=\"font-weight: 400;\">Used for hierarchical testbench components<\/span><\/p><\/td><\/tr><tr><td><p><span style=\"font-weight: 400;\">Examples: transactions and sequences<\/span><\/p><\/td><td><p><span style=\"font-weight: 400;\">Examples: drivers, monitors, agents and environments<\/span><\/p><\/td><\/tr><tr><td><p><span style=\"font-weight: 400;\">Does not have a component parent-child hierarchy<\/span><\/p><\/td><td><p><span style=\"font-weight: 400;\">Participates in the component hierarchy<\/span><\/p><\/td><\/tr><tr><td><p><span style=\"font-weight: 400;\">Does not use component phase callbacks<\/span><\/p><\/td><td><p><span style=\"font-weight: 400;\">Participates in UVM component phases<\/span><\/p><\/td><\/tr><\/tbody><\/table><p><span style=\"font-weight: 400;\">A sequence item typically extends <\/span><span style=\"font-weight: 400;\">uvm_sequence_item<\/span><span style=\"font-weight: 400;\">, while a driver extends <\/span><span style=\"font-weight: 400;\">uvm_driver<\/span><span style=\"font-weight: 400;\">.<\/span><\/p><p><b>Interview tip:<\/b><span style=\"font-weight: 400;\"> Explain the responsibility of the class as well as its base class. Memorizing the inheritance relationship alone does not demonstrate that you understand the architecture.<\/span><\/p><h3><span style=\"font-weight: 400;\">7. How do you use the UVM factory to replace a component?<\/span><\/h3><p><span style=\"font-weight: 400;\">The factory enables a testbench to substitute one registered implementation for another without changing every location where the component is created.<\/span><\/p><p><span style=\"font-weight: 400;\">Suppose a base driver is extended by a specialized driver:<\/span><\/p><p><span style=\"font-weight: 400;\">class debug_driver extends base_driver;<\/span><\/p><p>\u00a0<\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0`uvm_component_utils(debug_driver)<\/span><\/p><p>\u00a0<\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0function new(string name, uvm_component parent);<\/span><\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0super.new(name, parent);<\/span><\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0endfunction<\/span><\/p><p>\u00a0<\/p><p><span style=\"font-weight: 400;\">endclass<\/span><\/p><p>\u00a0<\/p><p><span style=\"font-weight: 400;\">A type override can be registered before the affected component is created:<\/span><\/p><p><span style=\"font-weight: 400;\">base_driver::type_id::set_type_override(<\/span><\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0debug_driver::get_type()<\/span><\/p><p><span style=\"font-weight: 400;\">);<\/span><\/p><p>\u00a0<\/p><p><span style=\"font-weight: 400;\">This substitution works when the original component is created through the factory, for example with <\/span><span style=\"font-weight: 400;\">base_driver::type_id::create()<\/span><span style=\"font-weight: 400;\">.<\/span><\/p><p><b>Likely follow-up:<\/b><span style=\"font-weight: 400;\"> Why might an override not take effect?<\/span><\/p><p><span style=\"font-weight: 400;\">Check whether both classes are registered correctly, whether the override is set before construction, and whether the original object is created through the factory rather than directly with <\/span><span style=\"font-weight: 400;\">new()<\/span><span style=\"font-weight: 400;\">.<\/span><\/p><h3><span style=\"font-weight: 400;\">8. How do you pass a virtual interface using <\/span><span style=\"font-weight: 400;\">uvm_config_db<\/span><span style=\"font-weight: 400;\">?<\/span><\/h3><p><span style=\"font-weight: 400;\">UVM components are class-based, while a SystemVerilog interface instance exists in the static simulation hierarchy. A virtual interface lets a class-based component access that interface.<\/span><\/p><p><span style=\"font-weight: 400;\">The top-level module can publish the interface instance:<\/span><\/p><p><span style=\"font-weight: 400;\">uvm_config_db#(virtual bus_if)::set(<\/span><\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0null,<\/span><\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0&#8220;uvm_test_top.env.agent.driver&#8221;,<\/span><\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0&#8220;vif&#8221;,<\/span><\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0bus_vif<\/span><\/p><p><span style=\"font-weight: 400;\">);<\/span><\/p><p>\u00a0<\/p><p><span style=\"font-weight: 400;\">The driver can retrieve it in <\/span><span style=\"font-weight: 400;\">build_phase<\/span><span style=\"font-weight: 400;\">:<\/span><\/p><p><span style=\"font-weight: 400;\">if (!uvm_config_db#(virtual bus_if)::get(<\/span><\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0this, &#8220;&#8221;, &#8220;vif&#8221;, vif))<\/span><\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0`uvm_fatal(&#8220;NOVIF&#8221;, &#8220;Virtual interface not configured&#8221;)<\/span><\/p><p>\u00a0<\/p><p><span style=\"font-weight: 400;\">The component path and field name must match the intended configuration scope.<\/span><\/p><p><b>Likely follow-up:<\/b><span style=\"font-weight: 400;\"> What would you check if <\/span><span style=\"font-weight: 400;\">get()<\/span><span style=\"font-weight: 400;\"> fails?<\/span><\/p><p><span style=\"font-weight: 400;\">Check the interface type, the field name (<\/span><span style=\"font-weight: 400;\">&#8220;vif&#8221;<\/span><span style=\"font-weight: 400;\">), the component hierarchy, and whether the configuration is set before it is retrieved.<\/span><\/p><h3><span style=\"font-weight: 400;\">9. How do you manage objections in a UVM test?<\/span><\/h3><p><span style=\"font-weight: 400;\">Objections help control when a task-based phase can complete. A test can raise an objection before starting its main sequence and drop it after the sequence completes.<\/span><\/p><p><span style=\"font-weight: 400;\">task run_phase(uvm_phase phase);<\/span><\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0bus_sequence seq;<\/span><\/p><p>\u00a0<\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0phase.raise_objection(this);<\/span><\/p><p>\u00a0<\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0seq = bus_sequence::type_id::create(&#8220;seq&#8221;);<\/span><\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0seq.start(env.agent.sequencer);<\/span><\/p><p>\u00a0<\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0phase.drop_objection(this);<\/span><\/p><p><span style=\"font-weight: 400;\">endtask<\/span><\/p><p>\u00a0<\/p><p><span style=\"font-weight: 400;\">If the test drops its objection before required activity finishes, the run phase may end prematurely. If an objection is never dropped, the simulation can remain active longer than intended.<\/span><\/p><p><b>Likely follow-up:<\/b><span style=\"font-weight: 400;\"> Why is the objection raised before starting the sequence?<\/span><\/p><p><span style=\"font-weight: 400;\">It prevents the phase from completing while the intended stimulus is running. The objection should be dropped only when the work protected by it is complete.<\/span><\/p><h3><span style=\"font-weight: 400;\">10. How do you write constraints for a randomized transaction?<\/span><\/h3><p><span style=\"font-weight: 400;\">Constraints restrict random values to legal scenarios.<\/span><\/p><p><span style=\"font-weight: 400;\">class aligned_item extends uvm_sequence_item;<\/span><\/p><p>\u00a0<\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0rand bit [7:0] addr;<\/span><\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0rand bit [31:0] data;<\/span><\/p><p>\u00a0<\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0constraint addr_alignment {<\/span><\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0addr[1:0] == 2&#8217;b00;<\/span><\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0}<\/span><\/p><p>\u00a0<\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0constraint addr_range {<\/span><\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0addr inside {[8&#8217;h10:8&#8217;hF0]};<\/span><\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0}<\/span><\/p><p>\u00a0<\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0`uvm_object_utils(aligned_item)<\/span><\/p><p>\u00a0<\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0function new(string name = &#8220;aligned_item&#8221;);<\/span><\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0super.new(name);<\/span><\/p><p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0endfunction<\/span><\/p><p>\u00a0<\/p><p><span style=\"font-weight: 400;\">endclass<\/span><\/p><p>\u00a0<\/p><p><span style=\"font-weight: 400;\">The address must fall within the specified range and be aligned to a four-byte boundary.<\/span><\/p><p><span style=\"font-weight: 400;\">A useful follow-up is to ask what happens when two constraints conflict. For example, requiring an address to be both below 10 and above 20 leaves no legal solution. In that case, <\/span><span style=\"font-weight: 400;\">randomize()<\/span><span style=\"font-weight: 400;\"> fails, so the calling code should check the return value.<\/span><\/p><h3><span style=\"font-weight: 400;\">11. What is the difference between an active and a passive UVM agent?<\/span><\/h3><p><span style=\"font-weight: 400;\">An agent groups components associated with a DUT interface or protocol.<\/span><\/p><p><span style=\"font-weight: 400;\">An <\/span><b>active agent<\/b><span style=\"font-weight: 400;\"> generally contains a sequencer, driver, and monitor. It can generate and drive stimulus while observing the response.<\/span><\/p><p><span style=\"font-weight: 400;\">A <\/span><b>passive agent<\/b><span style=\"font-weight: 400;\"> typically contains a monitor and observes activity generated elsewhere.<\/span><\/p><p><span style=\"font-weight: 400;\">For example, a subsystem may already have another component controlling a bus. A passive agent can monitor that bus and provide transactions to checking and coverage components without driving it.<\/span><\/p><p><b>Likely follow-up:<\/b><span style=\"font-weight: 400;\"> Can a passive agent contribute to a scoreboard?<\/span><\/p><p><span style=\"font-weight: 400;\">Yes. Its monitor can publish observed transactions through an analysis port, just as a monitor in an active agent can.<\/span><\/p><h3><span style=\"font-weight: 400;\">12. How would you debug a scoreboard mismatch?<\/span><\/h3><p><span style=\"font-weight: 400;\">Do not immediately assume the DUT is faulty. Trace the expected and actual transaction paths and identify where they first differ.<\/span><\/p><p><span style=\"font-weight: 400;\">Check:<\/span><\/p><ol><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Was the expected transaction generated correctly?<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Did the driver execute the intended transaction?<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Did the monitor sample the correct handshake and reconstruct the fields properly?<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Are transactions arriving in the expected order?<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Does the reference model account for protocol latency?<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Are reset and simultaneous-operation cases handled correctly?<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Does the comparison handle unknown values appropriately?<\/span><\/li><\/ol><p><span style=\"font-weight: 400;\">A useful scoreboard report should include the expected value, actual value, transaction identifier, and relevant protocol context. A generic \u201ccomparison failed\u201d message is much less useful for debugging.<\/span><\/p><h3><span style=\"font-weight: 400;\">13. How do you debug a UVM test that ends before all transactions finish?<\/span><\/h3><p><span style=\"font-weight: 400;\">Start by checking objection handling and sequence execution.<\/span><\/p><p><span style=\"font-weight: 400;\">Common causes include:<\/span><\/p><ul><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The test does not raise an objection for required run-time activity.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The objection is dropped before the sequence completes.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The sequence finishes earlier than expected.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The driver is blocked waiting for a handshake.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The driver and sequencer handshake is incomplete.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">A timeout or explicit simulation termination occurs.<\/span><\/li><\/ul><p><span style=\"font-weight: 400;\">Add informative messages at the beginning and end of the sequence, around transaction retrieval in the driver, and when the driver completes each item. This helps locate where execution stops.<\/span><\/p><h3><span style=\"font-weight: 400;\">14. What is the difference between a sequence, sequencer, and driver?<\/span><\/h3><p><span style=\"font-weight: 400;\">These three components work together but have different responsibilities.<\/span><\/p><ul><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Sequence:<\/b><span style=\"font-weight: 400;\"> Defines the stimulus scenario and generates sequence items.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Sequencer:<\/b><span style=\"font-weight: 400;\"> Manages the flow of sequence items from sequences to the driver.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Driver:<\/b><span style=\"font-weight: 400;\"> Converts received transactions into signal-level activity on the DUT interface.<\/span><\/li><\/ul><p><span style=\"font-weight: 400;\">A typical flow is:<\/span><\/p><p><b>Sequence \u2192 Sequencer \u2192 Driver \u2192 DUT<\/b><\/p><p><span style=\"font-weight: 400;\">The monitor observes the resulting DUT activity and publishes transactions to checking or coverage components.<\/span><\/p><p><span style=\"font-weight: 400;\">An interviewer may ask you to explain this flow using a simple bus transaction. Be prepared to describe where the transaction is created, randomized, handed to the driver, driven onto the interface, and observed.<\/span><\/p><h3><span style=\"font-weight: 400;\">How should you prepare for UVM coding interviews?<\/span><\/h3><p><span style=\"font-weight: 400;\">Practice by building a small verification environment in stages:<\/span><\/p><ol><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Create a sequence item with fields and constraints.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Write a sequence that generates multiple items.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Implement a driver for a clearly defined protocol.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Add a monitor that reconstructs transactions.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Connect the monitor to a scoreboard.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Pass the virtual interface using configuration.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Add useful reporting and debug a deliberate failure.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Add functional coverage for meaningful scenarios.<\/span><\/li><\/ol><p><span style=\"font-weight: 400;\">For broader preparation, review the<\/span> <span style=\"font-weight: 400;\">practical<\/span><a href=\"https:\/\/inskill.in\/training\/vlsi\/vlsi-verification-engineer-interview-questions\/\"> <span style=\"font-weight: 400;\">VLSI verification interview questions<\/span><\/a><span style=\"font-weight: 400;\">.<\/span><\/p><p><span style=\"font-weight: 400;\">For project-oriented questions, also practise explaining how you developed a testbench, isolated a failure, or improved checking. The<\/span><a href=\"https:\/\/inskill.in\/training\/vlsi\/how-to-explain-vlsi-project-in-technical-interview\/\"> <span style=\"font-weight: 400;\">guide to explaining a VLSI project in a technical interview<\/span><\/a><span style=\"font-weight: 400;\"> can help structure those answers.<\/span><\/p><h4><span style=\"font-weight: 400;\">Final Takeaway<\/span><\/h4><p><span style=\"font-weight: 400;\">UVM coding interviews test whether you can build a verification environment that is correct, reusable, and debuggable. Prioritize transaction creation, sequence-driver communication, monitor-to-scoreboard connections, factory overrides, virtual interfaces, objections, and constrained randomization.<\/span><\/p><p><span style=\"font-weight: 400;\">The strongest answers explain not only what the code does, but also why the component is needed, how it communicates with the rest of the environment, and what could go wrong.<\/span><\/p><p><span style=\"font-weight: 400;\">Practise writing the code from a blank file, tracing transactions through the environment, and debugging realistic failures. That is more valuable than memorizing isolated definitions.<\/span><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>UVM (Universal Verification Methodology) interviews often go beyond definitions such as sequence, sequencer, driver, and monitor. Interviewers may ask you to write a transaction class, implement a sequence, connect a monitor to a scoreboard, debug a configuration failure, or explain why a test ends before all transactions are processed. For functional verification engineers, the goal [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[8],"tags":[],"class_list":["post-10277","post","type-post","status-publish","format-standard","hentry","category-vlsi"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.7 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>UVM Coding Interview Questions With Practical Examples<\/title>\n<meta name=\"description\" content=\"Prepare for UVM coding interviews with practical SystemVerilog examples covering sequences, drivers, monitors, scoreboards, factory overrides, and debugging.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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