uvm白皮书练习_ch2_ch231_加入transaction

2.3 为验证平平台加入各种组件
uvm白皮书练习_ch2_ch231_加入transaction

代码部分

top_tb.sv

`timescale 1ns / 1ps
`include "uvm_macros.svh"import uvm_pkg::*;
/*只能现在*/`include "my_if.sv"
`include "my_transaction.sv"
`include "my_driver.sv"module top_tb();
/*time set*/
initial begin$display("start sim");#1.5ms;$finish;
end/*fsdb*/
initial begin$display("fsdbDumpfilrs is start at %d",$time);$fsdbDumpfile("verilog.fsdb");$fsdbDumpvars(0);
endreg             clk;
reg             rst_n;
reg     [7:0]   rxd;
reg             rx_dv;
wire    [7:0]   txd;
wire            tx_en;my_if input_if  (clk,rst_n);
my_if output_if (clk,rst_n);initial beginclk = 0;forever begin#100ns clk = ~ clk;end
endinitial beginrst_n =1'b0 ;#1us;rst_n =1'b1 ;
enddut my_dut(.clk   (clk      ),.rst_n (rst_n    ),.rxd   (input_if.data      ),.rx_dv (input_if.valid    ),.txd   (output_if.data      ),.tx_en (output_if.valid    ) );// initial begin
//     my_driver drv;
//     drv=new("drv",null);
//     drv.main_phase(null);
//     $finish;
// end
initial beginrun_test("my_driver");
endinitial beginuvm_config_db#(virtual my_if)::set(null, "uvm_test_top", "vif", input_if);    
endendmodule

---

my_if.sv

`ifndef MY_IF__SV
`define MY_IF__SV
interface my_if(input clk,input rst_n);logic [7:0] data;logic       valid;
endinterface //my_if`endif 

---

my_transaction.sv

`ifndef MY_TRANSACTION__SV
`define MY_TRANSACTION__SVclass my_transaction extends uvm_sequence_item;rand bit[47:0] dmac;rand bit[47:0] smac;rand bit[15:0] ether_type;rand byte      pload[];rand bit[31:0] crc;constraint pload_cons{pload.size >= 46;pload.size <= 1500;}function bit[31:0] calc_crc();return 32'h0;endfunctionfunction void post_randomize();crc = calc_crc;endfunction`uvm_object_utils(my_transaction)function new(string name = "my_transaction");super.new();endfunction
endclass
`endif

---

my_driver.sv

// `ifndef MY_DRIVER__SV
// `define MY_DRIVER__SV
// class my_driver extends uvm_driver;
//    virtual my_if vif;
//    `uvm_component_utils(my_driver)    //没有后缀//    function new(string name="my_driver",uvm_component parent = null);
//       super.new(name,parent);
//       `uvm_info("my_driver", "new is called", UVM_LOW)
//    endfunction //new()//    virtual function void build_phase(uvm_phase phase);
//       super.build_phase(phase);
//       `uvm_info("my_driver", "build phase is caslled", UVM_LOW)
//       if(!uvm_config_db#(virtual my_if)::get(this, "", "vif", vif))
//          `uvm_fatal("my_driver", "virtual interface must be set for vif!!!")  //没有后缀
//    endfunction//    extern  task main_phase(uvm_phase phase);
//    extern  task drive_one_pkt(my_transaction tr);// endclass //my_driver extends uvm_driver`ifndef MY_DRIVER__SV
`define MY_DRIVER__SV
class my_driver extends uvm_driver;virtual my_if vif;`uvm_component_utils(my_driver)function new(string name = "my_driver", uvm_component parent = null);super.new(name, parent);endfunctionvirtual function void build_phase(uvm_phase phase);super.build_phase(phase);if(!uvm_config_db#(virtual my_if)::get(this, "", "vif", vif))`uvm_fatal("my_driver", "virtual interface must be set for vif!!!")endfunctionextern task main_phase(uvm_phase phase);extern task drive_one_pkt(my_transaction tr);
endclasstask my_driver::main_phase (uvm_phase phase);my_transaction tr ; /*先声明数组*/phase.raise_objection(this);    //有后缀，项目真起始点vif.data    <= 8'b0; vif.valid   <= 1'b0;//先来一个初始化while(!vif.rst_n)@(posedge vif.clk);for(int i = 0; i < 2; i++)begin   //发两轮数据包tr = new("tr");// assert (tr.randomize() with {pload.size ==20;});//源码200,这里减到20，进行随机初始化assert (tr.randomize() with {pload.size ==50;});//源码200,这里减到20，进行随机初始化// else   error_process  //本来此处还有断言，源码处暂时没有drive_one_pkt(tr);endrepeat(5) @(posedge vif.clk);//等待5个时钟// vif.valid <= 1'b0;phase.drop_objection(this);//运行结束
endtask //my_driver::main_phasetask my_driver::drive_one_pkt(my_transaction tr);bit [47:0] tmp_data;bit [7:0] data_q[$]; //push dmac to data_qtmp_data = tr.dmac;for(int i = 0; i < 6; i++) begindata_q.push_back(tmp_data[7:0]);tmp_data = (tmp_data >> 8);end//push smac to data_qtmp_data = tr.smac;for(int i = 0; i < 6; i++) begindata_q.push_back(tmp_data[7:0]);tmp_data = (tmp_data >> 8);end//push ether_type to data_qtmp_data = tr.ether_type;for(int i = 0; i < 2; i++) begindata_q.push_back(tmp_data[7:0]);tmp_data = (tmp_data >> 8);end//push payload to data_qfor(int i = 0; i < tr.pload.size; i++) begindata_q.push_back(tr.pload[i]);end//push crc to data_qtmp_data = tr.crc;for(int i = 0; i < 4; i++) begindata_q.push_back(tmp_data[7:0]);tmp_data = (tmp_data >> 8);end`uvm_info("my_driver", "begin to drive one pkt", UVM_LOW);repeat(3) @(posedge vif.clk);while(data_q.size() > 0) begin@(posedge vif.clk);vif.valid <= 1'b1;vif.data <= data_q.pop_front(); end@(posedge vif.clk);vif.valid <= 1'b0;`uvm_info("my_driver", "end drive one pkt", UVM_LOW);
endtask`endif// /*
// 注册
// main phase// driver one pkt// */

---

仿真结果

UVM_INFO @ 0: reporter [RNTST] Running test my_driver...
UVM_INFO my_driver.sv(100) @ 1100000: uvm_test_top [my_driver] begin to drive one pkt
UVM_INFO my_driver.sv(111) @ 15500000: uvm_test_top [my_driver] end drive one pkt
UVM_INFO my_driver.sv(100) @ 15500000: uvm_test_top [my_driver] begin to drive one pkt
UVM_INFO my_driver.sv(111) @ 29900000: uvm_test_top [my_driver] end drive one pkt--- UVM Report Summary ---** Report counts by severity
UVM_INFO :    5
UVM_WARNING :    0
UVM_ERROR :    0
UVM_FATAL :    0
** Report counts by id
[RNTST]     1
[my_driver]     4

---

小结

Error-[CNST-CIF] Constraints inconsistency failure
my_driver.sv, 57Constraints are inconsistent and cannot be solved.Please check the inconsistent constraints being printed above and rewrite them.

约束超出预设范围，会导致失败
解决方法，使用范围内的数据值进行随机化