TLM通信示例11：TLM FIFO Example

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TLM FIFO 为两个独立运行的进程之间的事务提供存储服务。

• FIFO可以用作生产者和消费者之间的缓冲区
• TLM FIFO 由 put 和 get 方法组成
• Producer port连接到 FIFO 的 put_export
• Consumer port连接到FIFO的get_export

TLM TesetBench 组件

————————————————————– 
Name                              Type 
————————————————————– 
uvm_test_top                  basic_test 
env                                environment 
comp_a                     component_a 
trans_out               uvm_blocking_put_port 
comp_b                     component_b 
trans_in                 uvm_blocking_get_port 
fifo_ab                      uvm_tlm_fifo #(T) 
get_ap                   uvm_analysis_port 
get_peek_export   uvm_get_peek_imp 
put_ap                   uvm_analysis_port 
put_export             uvm_put_imp
————————————————————–

在 comp_a 中实现port

class component_a extends uvm_component;
  
  transaction trans;
  uvm_blocking_put_port#(transaction) trans_out; 
  
  `uvm_component_utils(component_a)
  
  //--------------------------------------- 
  // Constructor
  //---------------------------------------
  function new(string name, uvm_component parent);
    super.new(name, parent);
    trans_out = new("trans_out", this); 
  endfunction : new

  //---------------------------------------
  // run_phase 
  //---------------------------------------
  virtual task run_phase(uvm_phase phase);
    phase.raise_objection(this);
    
    trans = transaction::type_id::create("trans", this);

    void'(trans.randomize());
    `uvm_info(get_type_name(),$sformatf(" tranaction randomized"),UVM_LOW)
    `uvm_info(get_type_name(),$sformatf(" Printing trans, \n %s",trans.sprint()),UVM_LOW)
    
    `uvm_info(get_type_name(),$sformatf(" Before calling port put method"),UVM_LOW)
    trans_out.put(trans);
    `uvm_info(get_type_name(),$sformatf(" After  calling port put method"),UVM_LOW)
    
    phase.drop_objection(this);
  endtask : run_phase

endclass : component_a

在 comp_b 中实现port

class component_b extends uvm_component;
  
  transaction trans;
  uvm_blocking_get_port#(transaction) trans_in;  

  `uvm_component_utils(component_b)
  
  //--------------------------------------- 
  // Constructor
  //---------------------------------------
  function new(string name, uvm_component parent);
    super.new(name, parent);
    trans_in = new("trans_in", this);
  endfunction : new
  
  //---------------------------------------
  // run_phase 
  //---------------------------------------
  virtual task run_phase(uvm_phase phase);
    phase.raise_objection(this);
    
    `uvm_info(get_type_name(),$sformatf(" Before calling port get method"),UVM_LOW)
    trans_in.get(trans);
    `uvm_info(get_type_name(),$sformatf(" After  calling port get method"),UVM_LOW)
    `uvm_info(get_type_name(),$sformatf(" Printing trans, \n %s",trans.sprint()),UVM_LOW)
    
    phase.drop_objection(this);
  endtask : run_phase

endclass : component_b

在env中实现 TLM FIFO

`include "transaction.sv"
`include "component_a.sv"
`include "component_b.sv"

class environment extends uvm_env;
  
  //---------------------------------------
  // Components Instantiation
  //---------------------------------------
  component_a comp_a;
  component_b comp_b;
  
  uvm_tlm_fifo #(transaction) fifo_ab;
  
  `uvm_component_utils(environment)
  
  //--------------------------------------- 
  // Constructor
  //---------------------------------------
  function new(string name, uvm_component parent);
    super.new(name, parent);
  endfunction : new

  //---------------------------------------
  // build_phase - Create the components
  //---------------------------------------
  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);
    
    fifo_ab = new("fifo_ab", this);
  endfunction : build_phase
  
  //---------------------------------------
  // Connect_phase 
  //---------------------------------------
  function void connect_phase(uvm_phase phase);
    comp_a.trans_out.connect(fifo_ab.put_export);
    comp_b.trans_in.connect(fifo_ab.get_export);
  endfunction : connect_phase
endclass : environment

仿真结果：

UVM_INFO @ 0: reporter [RNTST] Running test basic_test...
---------------------------------------------------------
Name Type Size Value
---------------------------------------------------------
uvm_test_top basic_test - @1815
env environment - @1882
comp_a component_a - @1914
trans_out uvm_blocking_put_port - @1965
comp_b component_b - @1998
trans_in uvm_blocking_get_port - @2048
fifo_ab uvm_tlm_fifo #(T) - @1999
get_ap uvm_analysis_port - @2278
get_peek_export uvm_get_peek_imp - @2178
put_ap uvm_analysis_port - @2228
put_export uvm_put_imp - @2128
---------------------------------------------------------
UVM_INFO component_b.sv(26) @ 0: uvm_test_top.env.comp_b [component_b] Before calling port get method
UVM_INFO component_a.sv(29) @ 0: uvm_test_top.env.comp_a [component_a] tranaction randomized
UVM_INFO component_a.sv(30) @ 0: uvm_test_top.env.comp_a [component_a] Printing trans,
---------------------------------
Name Type Size Value
---------------------------------
trans transaction - @1857
addr integral 4 'h3
wr_rd integral 1 'h0
wdata integral 8 'h33
---------------------------------

UVM_INFO component_a.sv(32) @ 0: uvm_test_top.env.comp_a [component_a] Before calling port put method
UVM_INFO component_a.sv(34) @ 0: uvm_test_top.env.comp_a [component_a] After calling port put method
UVM_INFO component_b.sv(28) @ 0: uvm_test_top.env.comp_b [component_b] After calling port get method
UVM_INFO component_b.sv(29) @ 0: uvm_test_top.env.comp_b [component_b] Printing trans,
---------------------------------
Name Type Size Value
---------------------------------
trans transaction - @1857
addr integral 4 'h3
wr_rd integral 1 'h0
wdata integral 8 'h33
---------------------------------

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