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`include "uvm_macros.svh"

import uvm_pkg::*;

​

class component_A extends uvm_component;

  int id;

  `uvm_component_utils(component_A)

  function new(string name = "component_A", uvm_component parent = null);

    super.new(name, parent);

    id = 1;

  endfunction

  function display();

    `uvm_info(get_type_name(), $sformatf("inside component_A: id = %0d", id), UVM_LOW);

  endfunction

endclass

​

class component_B extends component_A;

  int receive_value;

  int id;

  `uvm_component_utils(component_B)

  function new(string name = "component_B", uvm_component parent = null);

    super.new(name, parent);

    id = 2;

  endfunction

  function void build_phase(uvm_phase phase);

    super.build_phase(phase);

    if(!uvm_config_db #(int)::get(this, "*", "value", receive_value))

      `uvm_fatal(get_type_name(), "get failed for resource in this scope");    

  endfunction

  function display();

    `uvm_info(get_type_name(), $sformatf("inside component_B: id = %0d, receive_value = %0d", id, receive_value), UVM_LOW);

  endfunction

endclass

​

class env extends uvm_env;

  `uvm_component_utils(env)

  component_A comp_A;

  component_B comp_B;

  function new(string name = "env", uvm_component parent = null);

    super.new(name, parent);

  endfunction

  function void build_phase(uvm_phase phase);

    super.build_phase(phase);

    comp_A = component_A ::type_id::create("comp_A", this);

    comp_B = component_B ::type_id::create("comp_B", this);

    uvm_config_db #(int)::set(this, "*", "value", 200);

  endfunction

  task run_phase(uvm_phase phase);

    super.run_phase(phase);

    void'(comp_A.display());

    void'(comp_B.display());

  endtask

endclass

​

class my_test extends uvm_test;

  bit control;

  `uvm_component_utils(my_test)

  env env_o;

  function new(string name = "my_test", uvm_component parent = null);

    super.new(name, parent);

  endfunction

  function void build_phase(uvm_phase phase);

    super.build_phase(phase);

    env_o = env::type_id::create("env_o", this);

    uvm_config_db #(int)::set(null, "*", "value", 100);

  endfunction

  function void end_of_elaboration_phase(uvm_phase phase);

    super.end_of_elaboration_phase(phase);

    uvm_top.print_topology();

  endfunction

endclass

​

module tb_top;

  initial begin

    run_test("my_test");

  end

endmodule