一个简单的 只有driver uvm

一个简单的只有driver uvm测试环境通常用于验证一个设计单元的输入和输出。在这种环境中，最重要的组件是driver。它负责向设计单元发送有效数据和控制信号，并且能够管理时序和发送请求。driver往往是根据设计规范和需求编写的，以确保设计单元在接收到正确的输入时能够产生预期的输出。

在这种简单的测试环境中，driver通常是满足一个spec接口的UVM组件。spec接口定义了与设计单元进行通信所需的各种数据和信号。driver会接收到来自测试端口的事务，并将其转换为对设计单元的操作。它可能需要处理一些低层次的细节，比如时钟域的转换、接口转换和顺序管理，以确保正确的传输和操作顺序。

尽管只有driver在测试环境中，但实际上在一些简单的测试场景中，这种环境已经足够了。只有driver的环境可以轻松地对设计单元的输入和输出进行单元级别的验证，而无需引入过多的复杂性。对于一些只需要测试接口行为或一些简单逻辑的设计单元来说，这样的环境非常适用。

然而，在更复杂的设计单元验证中，这种简单的只有driver的环境可能无法满足需求。在这种情况下，可能需要引入其他组件，比如monitor、scoreboard和Sequencer等，以进行更全面的功能和性能验证。但是对于一些简单的测试场景来说，一个只有driver的环境是一个简单而有效的解决方案。

相关问题

uvm一个driver怎么多个transaction

一个 UVM 的 driver 可以管理多个 transaction，通过使用一个队列来存储多个 transaction，然后 driver 可以按照队列中的顺序逐个处理这些 transaction。当 driver 处理完一个 transaction 后，它会从队列中移除该 transaction，然后继续处理下一个 transaction。这样，一个 driver 就可以管理多个 transaction。

写一个简易的uvm平台

UVM（Universal Verification Methodology）是一种基于SystemVerilog的验证方法学，用于构建可重用、可扩展的验证环境。以下是一个简单的UVM平台的实现示例。

1. 创建一个Testbench模块，该模块包含了UVM框架的主要组件，例如Env、Agent、Driver、Monitor和Scoreboard。

`include "uvm_macros.svh"

module tb_top;

  // UVM Components
  `uvm_component_name(tb_env)
  tb_env env;

  `uvm_component_name(tb_agent)
  tb_agent agent;

  `uvm_component_name(tb_driver)
  tb_driver driver;

  `uvm_component_name(tb_monitor)
  tb_monitor monitor;

  `uvm_component_name(tb_scoreboard)
  tb_scoreboard scoreboard;

  // Constructor
  function new(string name, uvm_component parent);
    super.new(name, parent);
  endfunction

  // Build Phase
  function void build_phase(uvm_phase phase);
    super.build_phase(phase);

    // Create UVM Components
    env = tb_env::type_id::create("env", this);
    agent = tb_agent::type_id::create("agent", this);
    driver = tb_driver::type_id::create("driver", this);
    monitor = tb_monitor::type_id::create("monitor", this);
    scoreboard = tb_scoreboard::type_id::create("scoreboard", this);

    // Connect UVM Components
    agent.monitor_port.connect(monitor.analysis_export);
    driver.seq_item_port.connect(agent.seq_item_export);
    scoreboard.analysis_export.connect(agent.scoreboard_export);
  endfunction

  // Run Phase
  task run_phase(uvm_phase phase);
    super.run_phase(phase);
  endtask

endmodule

2. 创建一个Env模块，该模块包含了被测设备的接口和其他环境组件。

`include "uvm_macros.svh"

class tb_env extends uvm_env;

  // UVM Components
  `uvm_component_name(tb_env_driver)
  tb_env_driver driver;

  `uvm_component_name(tb_env_monitor)
  tb_env_monitor monitor;

  // Constructor
  function new(string name, uvm_component parent);
    super.new(name, parent);
  endfunction

  // Build Phase
  function void build_phase(uvm_phase phase);
    super.build_phase(phase);

    // Create UVM Components
    driver = tb_env_driver::type_id::create("driver", this);
    monitor = tb_env_monitor::type_id::create("monitor", this);

    // Connect UVM Components
    driver.clock = env_clk;
    driver.reset = env_reset;
    monitor.clock = env_clk;
    monitor.reset = env_reset;
  endfunction

endclass

class tb_env_driver extends uvm_driver #(tb_env_packet);

  // Interface
  uvm_blocking_put_port #(tb_env_packet) put_port;

  // Constructor
  function new(string name, uvm_component parent);
    super.new(name, parent);
  endfunction

  // Run Phase
  virtual task run_phase(uvm_phase phase);
    tb_env_packet packet;
    forever begin
      // Generate Packet
      packet = new;
      packet.data = $random;

      // Send Packet
      put_port.put(packet);

      // Delay
      #10;
    end
  endtask

endclass

class tb_env_monitor extends uvm_monitor #(tb_env_packet);

  // Interface
  uvm_analysis_port #(tb_env_packet) analysis_port;

  // Constructor
  function new(string name, uvm_component parent);
    super.new(name, parent);
  endfunction

  // Run Phase
  virtual task run_phase(uvm_phase phase);
    tb_env_packet packet;
    forever begin
      // Wait for Packet
      @(posedge env_clk);
      packet = get_packet();

      // Send Packet to Analysis
      analysis_port.write(packet);
    end
  endtask

  // Private Methods
  function tb_env_packet get_packet();
    tb_env_packet packet;
    packet = new;
    packet.data = env_data;
    return packet;
  endfunction

endclass

3. 创建一个Agent模块，该模块包含了一个Driver和一个Monitor。

`include "uvm_macros.svh"

class tb_agent extends uvm_agent;

  // UVM Components
  `uvm_component_name(tb_agent_driver)
  tb_agent_driver driver;

  `uvm_component_name(tb_agent_monitor)
  tb_agent_monitor monitor;

  // Constructor
  function new(string name, uvm_component parent);
    super.new(name, parent);
  endfunction

  // Build Phase
  function void build_phase(uvm_phase phase);
    super.build_phase(phase);

    // Create UVM Components
    driver = tb_agent_driver::type_id::create("driver", this);
    monitor = tb_agent_monitor::type_id::create("monitor", this);

    // Connect UVM Components
    monitor.agent = this;
    driver.monitor_port.connect(monitor.analysis_export);
  endfunction

endclass

class tb_agent_driver extends uvm_driver #(tb_agent_sequence_item);

  // Interface
  uvm_blocking_put_port #(tb_agent_sequence_item) seq_item_port;

  // Constructor
  function new(string name, uvm_component parent);
    super.new(name, parent);
  endfunction

  // Run Phase
  virtual task run_phase(uvm_phase phase);
    tb_agent_sequence_item seq_item;
    forever begin
      // Get Sequence Item
      seq_item_port.get(seq_item);

      // Drive Sequence Item
      drive_sequence_item(seq_item);

      // Delay
      #10;
    end
  endtask

  // Private Methods
  function void drive_sequence_item(tb_agent_sequence_item seq_item);
    // Drive Sequence Item
  endfunction

endclass

class tb_agent_monitor extends uvm_monitor #(tb_agent_sequence_item);

  // Interface
  uvm_analysis_port #(tb_agent_sequence_item) analysis_port;

  // Agent
  tb_agent agent;

  // Constructor
  function new(string name, uvm_component parent);
    super.new(name, parent);
  endfunction

  // Run Phase
  virtual task run_phase(uvm_phase phase);
    tb_agent_sequence_item seq_item;
    forever begin
      // Wait for Sequence Item
      @(posedge agent.clock);
      seq_item = get_sequence_item();

      // Send Sequence Item to Analysis
      analysis_port.write(seq_item);
    end
  endtask

  // Private Methods
  function tb_agent_sequence_item get_sequence_item();
    tb_agent_sequence_item seq_item;
    seq_item = new;
    return seq_item;
  endfunction

endclass

4. 创建一个Scoreboard模块，该模块用于比对Agent的输出和Env的输出。

`include "uvm_macros.svh"

class tb_scoreboard extends uvm_scoreboard;

  // UVM Components
  `uvm_component_name(tb_scoreboard_driver)
  tb_scoreboard_driver driver;

  // Constructor
  function new(string name, uvm_component parent);
    super.new(name, parent);
  endfunction

  // Build Phase
  function void build_phase(uvm_phase phase);
    super.build_phase(phase);

    // Create UVM Components
    driver = tb_scoreboard_driver::type_id::create("driver", this);

    // Connect UVM Components
    driver.agent = agent;
  endfunction

endclass

class tb_scoreboard_driver extends uvm_driver #(tb_scoreboard_sequence_item);

  // Agent
  tb_agent agent;

  // Constructor
  function new(string name, uvm_component parent);
    super.new(name, parent);
  endfunction

  // Run Phase
  virtual task run_phase(uvm_phase phase);
    tb_scoreboard_sequence_item exp_seq_item;
    tb_agent_sequence_item act_seq_item;
    forever begin
      // Get Expected Sequence Item
      exp_seq_item = get_expected_sequence_item();

      // Get Actual Sequence Item
      act_seq_item = get_actual_sequence_item();

      // Compare Sequence Items
      compare_sequence_items(exp_seq_item, act_seq_item);

      // Delay
      #10;
    end
  endtask

  // Private Methods
  function tb_scoreboard_sequence_item get_expected_sequence_item();
    tb_scoreboard_sequence_item seq_item;
    seq_item = new;
    return seq_item;
  endfunction

  function tb_agent_sequence_item get_actual_sequence_item();
    tb_agent_sequence_item seq_item;
    seq_item = new;
    return seq_item;
  endfunction

  function void compare_sequence_items(tb_scoreboard_sequence_item exp_seq_item, tb_agent_sequence_item act_seq_item);
    // Compare Sequence Items
  endfunction

endclass

5. 创建一个Sequence模块，该模块用于生成测试序列。

`include "uvm_macros.svh"

class tb_sequence extends uvm_sequence #(tb_agent_sequence_item);

  // Constructor
  function new(string name);
    super.new(name);
  endfunction

  // Body
  virtual task body();
    tb_agent_sequence_item seq_item;
    forever begin
      // Generate Sequence Item
      seq_item = new;

      // Send Sequence Item
      seq_item_port.put(seq_item);

      // Delay
      #10;
    end
  endtask

endclass

6. 最后，在顶层模块中实例化Testbench模块和Sequence模块，并运行UVM测试。

module top;

  // Testbench
  tb_top tb;

  // Sequence
  tb_sequence seq;

  // Clock
  logic clk;

  // Reset
  logic reset;

  // Constructor
  initial begin
    // Create Testbench
    tb = new;

    // Create Sequence
    seq = tb_sequence::type_id::create("seq");

    // Set Clock
    clk = 0;
    forever begin
      #5 clk = ~clk;
    end

    // Set Reset
    reset = 1;
    #10 reset = 0;

    // Run UVM Test
    run_test();
  end

endmodule

module env;

  // Clock
  logic clk;

  // Reset
  logic reset;

  // Data
  logic [31:0] data;

  // Constructor
  initial begin
    // Set Clock
    clk = 0;
    forever begin
      #5 clk = ~clk;
    end

    // Set Reset
    reset = 1;
    #10 reset = 0;

    // Run Testbench
    top.tb.env_clk = clk;
    top.tb.env_reset = reset;
    run_test();
  end

endmodule