`ifndef MY_DRIVER_SV
`define MY_DRIVER_SV
class my_driver extends uvm_driver#(my_transation);
    `uvm_component_utils(my_driver);
    virtual my_if vif;

    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

    function void build_phase(uvm_phase phase);
        super.build_phase(phase);
        `uvm_info("my_driver", "build_phase is called", UVM_LOW);
        if (!uvm_config_db#(virtual my_if)::get(this, "", "vif", vif)) begin
            `uvm_fatal("my_driver", "interface set error!");
        end
    endfunction: build_phase

    /* task main_phase(uvm_phase phase); */
    /*     /1* my_transation tr; *1/ */
    /*     phase.raise_objection(this); */
    /*     `uvm_info("my_driver", "main_phase is called!", UVM_LOW); */
    /*     vif.data<=8'b0; */
    /*     vif.valid<=1'b0; */
    /*     while(!vif.rst_n) begin */
    /*         @(posedge vif.clk); */
    /*     end */
    /*     /1* for (int i = 0; i < 256; i++) begin *1/ */
    /*     /1*     @(posedge vif.clk); *1/ */
    /*     /1*     vif.data<=$urandom_range(0,255); *1/ */
    /*     /1*     vif.valid<=1'b1; *1/ */
    /*     /1*     `uvm_info("my_driver", "data is drived!", UVM_LOW); *1/ */
    /*     /1* end *1/ */
    /*     for (int i = 0; i < 2; i++) begin */
    /*         /1* tr=new("tr"); *1/ */
    /*         /1* assert(tr.randomize with {pload.size==200;}); *1/ */
    /*         req = new("req"); */
    /*         assert(req.randomize with {pload.size==200;}); */
    /*         `uvm_info("main_phase", $sformatf("this is the %0d drive----------------------", i), UVM_LOW) */
    /*         drive_one_pkt(req); */
    /*         /1* drive_one_pkt(tr); *1/ */
    /*     end */

    /*     repeat (5) begin */
    /*         @(posedge vif.clk); */
    /*         vif.valid<=1'b0; */    
    /*     end */
    /*     phase.drop_objection(this); */
    /* endtask: main_phase */

    task main_phase(uvm_phase phase);
        vif.data <= 8'b0;
        vif.valid <= 1'b0;
        while(!vif.rst_n) begin
            @(posedge vif.clk);
        end
        while (1) begin
            /* seq_item_port.get_next_item(req); */
            seq_item_port.try_next_item(req);
            if (req==null) begin
                @(posedge vif.clk);
            end else begin
                drive_one_pkt(req);
                seq_item_port.item_done();
            end
        end

    endtask

    task drive_one_pkt(my_transation tr); 
        byte unsigned data_q[];
        int data_size;

        data_size = tr.pack_bytes(data_q) / 8;
        `uvm_info("drive_one_pkt", "start drive one packet", UVM_LOW);
        repeat (3) begin
            @(posedge vif.clk);
        end
        for (int i = 0; i < data_size; i++) begin
            @(posedge vif.clk);
            vif.valid<=1'b1;
            vif.data<= data_q[i];
        end

        @(posedge vif.clk);
        vif.valid<=1'b0;
        `uvm_info("drive_one_pkt", "one packet send over", UVM_LOW);

    endtask

    /* task drive_one_pkt(my_transation tr); */
    /*     bit [7:0] data_q[$]; */
    /*     pack_bytes(data_q, tr.dmac, 6); */
    /*     pack_bytes(data_q, tr.smac, 6); */
    /*     pack_bytes(data_q, tr.ether_type, 2); */
    /*     for (int i = 0; i < tr.pload.size; i++) begin */
    /*         data_q.push_back(tr.pload[i]); */
    /*         /1* $write("push %0d %0h|", i, tr.pload[i]); *1/ */
    /*     end */
    /*     pack_bytes(data_q, tr.crc, 4); */
    /*     `uvm_info("drive_one_pkt", "start drive one packet", UVM_LOW); */
    /*     repeat (3) begin */
    /*         @(posedge vif.clk); */
    /*     end */
    /*     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("drive_one_pkt", "one packet send over", UVM_LOW); */
    /* endtask: drive_one_pkt */

    /* function void pack_bytes(ref bit [7:0] data_q[$],input bit [47:0] data_i, input byte num); */
    /*     for (int i = 0; i < num; i++) begin */
    /*         data_q.push_back(data_i[7:0]); */
    /*         data_i=data_i>>8; */
    /*     end */
    /* endfunction: pack_bytes */

endclass : my_driver
`endif