Introduction
Introduction Get started Hello UVM example UVM Phases Part 1 UVM Phases Part 2 UVM Base Classes UVM Object and Core Methods UVM Components
Building a Testbench
UVM Transaction UVM Sequence UVM Sequencer UVM Driver UVM Monitor UVM Scoreboard UVM Agent UVM Environment UVM Test
Other Components
Coverage Collector
Execution Model
UVM Phases Objections
Communication
TLM Basics TLM Blocking Put Port TLM Non-Blocking Put Port TLM Blocking Peek Port Analysis Ports TLM FIFO
Configuration
UVM Factory UVM Config DB
Runtime Control
UVM Plusargs Seeds & Reproducibility Verbosity Control Debug Runtime Controls
Advanced
Virtual Sequences Virtual Sequencer
UVM RAL
Intro Abstraction Flexibility Comparison Coverage Minimum Requirements Learning Path Register Types First Implementation Register with 2 Fields Register with Reserved Bits Access Policies Part 1 Access Policies Part 2 Access Policies Part 3 Access Policies Part 4 Memory Modeling Register Block Adapter Introduction Adapter Methods Adapter Example Predictor Types Desired and Mirror Values Register Methods Desired Value Mirror Value

UVM Coverage Collector

The component responsible for collecting functional coverage from monitored transactions.

📘 What is a Coverage Collector?

A Coverage Collector is a passive UVM component that:

  • Receives transactions from the Monitor
  • Defines covergroups
  • Samples functional scenarios
  • Tracks verification completeness

It measures what has been verified, not whether the DUT is correct.

🏗 Position in UVM Architecture 

Sequence → Driver → DUT → Monitor → Coverage Collector

The Monitor reconstructs transactions and sends them through an analysis port to the Coverage Collector.

💻 Coverage Collector Example 

class my_coverage extends uvm_component;

  `uvm_component_utils(my_coverage)

  uvm_analysis_imp #(packet, my_coverage) analysis_export;

  packet pkt;

  covergroup cg;
    coverpoint pkt.addr {
      bins low  = {[0:15]};
      bins mid  = {[16:127]};
      bins high = {[128:255]};
    }

    coverpoint pkt.write;

    cross pkt.addr, pkt.write;
  endgroup

  function new(string name, uvm_component parent);
    super.new(name, parent);
    analysis_export = new("analysis_export", this);
    cg = new();
  endfunction

  function void write(packet t);
    pkt = t;
    cg.sample();
  endfunction

endclass
📊 What is Functional Coverage?

Functional coverage ensures that:

  • All important scenarios are exercised
  • All protocol states are visited
  • Corner cases are tested
  • Cross combinations are verified

It answers: Did we test everything?

🔄 Coverage Collector vs Scoreboard
Feature Coverage Collector Scoreboard
Purpose Measure coverage Check correctness
Uses Covergroups Yes No
Reports Errors No Yes
Passive Yes Yes
🚀 Why Coverage is Critical
  • Prevents missing corner cases
  • Improves regression quality
  • Helps achieve coverage closure
  • Required for tape-out readiness
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