class driver extends uvm_driver #(wrap_txn);
    `uvm_component_utils(driver)
    virtual axi_if vif;
    wrap_txn txn;
    function new(string name ="driver",uvm_component parent);
        suoer.new(name,parent);
    endfunction

    function void build_phase(uvm_phase phase);
        super.build_phase(phase);
        txn = wrap_txn::type_id::create("txn",this);
        if(!uvm_config_db #(axi_if)::get(this,"","vif",vif))
          `uvm_error("build phase","driver virtual interface failed")
    endfunction

    task run_phase(uvm_phase phase);
       forever 
        begin
            seq_item_port.get_next_item(txn);
            drive_logic(txn);
            seq_item_port.item_done();
        end
    endtask

    task drve_logic(wrap_txn txn);
        begin
            `uvm_info("AXI_DRIVER",$sformatf("driver started"),UVM_LOW);
            @(vif.drv_cb);
            vif.arst<=1;
            @(vif.drv_cb);
            vif.arst<=0;
            if(wr_rd <= 1)
            begin 
            vif.awid <= txn.awid;
            vif.awaddr<= txn.awaddr;
            vif.awburst <= txn.awburst;
            vif.awsize <= txn.awsize;
            vif.awlen <= txn.awlen;
            vif.awlock <= txn.awlen;
            vif.awprot <= txn.awprot;
            vif.awcache<= txn.awcache;
            vif.awvalid <= 1;
            wait(vif.drv_cb.awready == 1);
            vif.awvalid <= 0;
            @(vif.drv_cb);
            for(int i =1;i<=vif.awlen+1;i++)
            begin
            vif.wid <= txn.wid;
            vif.wdata<= txn.wdata.pop_front();
            vif.wstrb <= txn.wstrb;
            vif.awvalid <= 1;
            if(i == vif.awlen+1)
            vif.wlast <= txn.wlast;
            else
            vif.wlast <= 0;
            wait(vif.wready == 1);
            vif.wvalid <= 0;
            end
            @(vif.drv_cb);
            vif.bid <= txn.bid;
            vif.bresp <= txn.bresp;
            vif.bvalid <= 1;
            wait(vif.bready == 1);
            vif.bvalid <= 0;
          end
        else
        begin
            vif.arid <= txn.arid;
            vif.araddr<= txn.araddr;
            vif.arburst <= txn.arburst;
            vif.arsize <= txn.arsize;
            vif.arlen <= txn.arlen;
            vif.arlock <= txn.arlen;
            vif.arprot <= txn.arprot;
            vif.arcache<= txn.arcache;
            vif.arvalid <= 1;
            wait(vif.drv_cb.arready == 1);
            vif.arvalid <= 0;
            @(vif.drv_cb);
            end
        end
    endtask