uvm中写一个输入64bits数据并返回该数

在UVM（Universal Verification Methodology）中，可以通过创建一个sequence、一个driver和一个monitor来实现输入64bits数据并返回该数的功能。以下是一个简单的示例，展示了如何实现这一功能。 1. **创建sequence**： ```systemverilog class my_sequence extends uvm_sequence #(my_transaction); `uvm_object_utils(my_sequence) function new(string name = "my_sequence"); super.new(name); endfunction task body; my_transaction tx; tx = my_transaction::type_id::create("tx"); tx.data = 64'h123456789ABCDEF0; // 输入的64bits数据 start_item(tx); finish_item(tx); endtask endclass ``` 2. **创建transaction**： ```systemverilog class my_transaction extends uvm_sequence_item; `uvm_object_utils(my_transaction) rand bit [63:0] data; function new(string name = "my_transaction"); super.new(name); endfunction function void do_copy(uvm_object rhs); my_transaction rhs_; if(!$cast(rhs_, rhs)) begin `uvm_fatal("do_copy", "cast failed"); end data = rhs_.data; endfunction function bit do_compare(uvm_object rhs, uvm_comparer comparer); my_transaction rhs_; if(!$cast(rhs_, rhs)) begin return 0; end return (data == rhs_.data); endfunction function void do_print(uvm_printer printer); super.do_print(printer); printer.print_field_int("data", data, 64); endfunction endclass ``` 3. **创建driver**： ```systemverilog class my_driver extends uvm_driver #(my_transaction); `uvm_component_utils(my_driver) virtual my_if vif; function new(string name, uvm_component parent); super.new(name, parent); endfunction function void build_phase(uvm_phase phase); super.build_phase(phase); if(!uvm_config_db#(virtual my_if)::get(this, "", "vif", vif)) begin `uvm_fatal("NOVIF", "virtual interface not found") end endfunction task run_phase(uvm_phase phase); forever begin seq_item_port.get_next_item(req); // 驱动接口 vif.data_in = req.data; @(posedge vif.clk); seq_item_port.item_done(); end endtask endclass ``` 4. **创建monitor**： ```systemverilog class my_monitor extends uvm_monitor; `uvm_component_utils(my_monitor) virtual my_if vif; uvm_analysis_port #(my_transaction) ap; function new(string name, uvm_component parent); super.new(name, parent); endfunction function void build_phase(uvm_phase phase); super.build_phase(phase); if(!uvm_config_db#(virtual my_if)::get(this, "", "vif", vif)) begin `uvm_fatal("NOVIF", "virtual interface not found") end ap = new("ap", this); endfunction task run_phase(uvm_phase phase); my_transaction tx; forever begin @(posedge vif.clk); tx = my_transaction::type_id::create("tx"); tx.data = vif.data_out; ap.write(tx); end endtask endclass ``` 5. **创建agent**： ```systemverilog class my_agent extends uvm_agent; `uvm_component_utils(my_agent) my_driver driver; my_monitor monitor; virtual my_if vif; function new(string name, uvm_component parent); super.new(name, parent); endfunction function void build_phase(uvm_phase phase); super.build_phase(phase); driver = my_driver::type_id::create("driver", this); monitor = my_monitor::type_id::create("monitor", this); if(!uvm_config_db#(virtual my_if)::get(this, "", "vif", vif)) begin `uvm_fatal("NOVIF", "virtual interface not found") end uvm_config_db#(virtual my_if)::set(this, "driver", "vif", vif); uvm_config_db#(virtual my_if)::set(this, "monitor", "vif", vif); endfunction function void connect_phase(uvm_phase phase); super.connect_phase(phase); driver.seq_item_port.connect(sequencer.seq_item_export); endfunction endclass ``` 6. **创建environment**： ```systemverilog class my_env extends uvm_env; `uvm_component_utils(my_env) my_agent agent; my_scoreboard scoreboard; function new(string name, uvm_component parent); super.new(name, parent); endfunction function void build_phase(uvm_phase phase); super.build_phase(phase); agent = my_agent::type_id::create("agent", this); scoreboard = my_scoreboard::type_id::create("scoreboard", this); endfunction function void connect_phase(uvm_phase phase); super.connect_phase(phase); agent.monitor.ap.connect(scoreboard.analysis_export); endfunction endclass ``` 7. **创建test**： ```systemverilog class my_test extends uvm_test; `uvm_component_utils(my_test) my_env env; my_sequence seq; function new(string name, uvm_component parent); super.new(name, parent); endfunction function void build_phase(uvm_phase phase); super.build_phase(phase); env = my_env::type_id::create("env", this); seq = my_sequence::type_id::create("seq"); endfunction task run_phase(uvm_phase phase); phase.raise_objection(this); seq.start(env.agent.sequencer); phase.drop_objection(this); endtask endclass ``` 通过上述代码，可以实现输入64bits数据并返回该数的功能。