用verilog写一个AXI4的Master接口

以下是一个简单的AXI4 Master接口的Verilog实现：

module axi4_master (
    input         clk,       //系统时钟信号
    input         reset,     //系统复位信号
    input         start,     //启动信号
    input  [31:0] addr,      //AXI地址信号
    input  [31:0] data_in,   //AXI写数据信号
    output [31:0] data_out,  //AXI读数据信号
    output        done       //操作完成信号
);

    //AXI4 Master信号声明
    wire            m_axi_arvalid;
    wire  [31:0]    m_axi_araddr;
    wire  [7:0]     m_axi_arlen;
    wire  [1:0]     m_axi_arsize;
    wire  [2:0]     m_axi_arburst;
    wire            m_axi_arlock;
    wire  [3:0]     m_axi_arcache;
    wire  [3:0]     m_axi_arprot;
    wire            m_axi_arqos;
    wire            m_axi_arready;

    wire            m_axi_rvalid;
    wire  [31:0]    m_axi_rdata;
    wire  [1:0]     m_axi_rresp;
    wire            m_axi_rlast;
    wire            m_axi_rready;

    wire            m_axi_awvalid;
    wire  [31:0]    m_axi_awaddr;
    wire  [7:0]     m_axi_awlen;
    wire  [1:0]     m_axi_awsize;
    wire  [2:0]     m_axi_awburst;
    wire            m_axi_awlock;
    wire  [3:0]     m_axi_awcache;
    wire  [3:0]     m_axi_awprot;
    wire            m_axi_awqos;
    wire            m_axi_awready;

    wire            m_axi_wvalid;
    wire  [31:0]    m_axi_wdata;
    wire  [3:0]     m_axi_wstrb;
    wire            m_axi_wlast;
    wire            m_axi_wready;

    //AXI4 Master模块实例化
    axi4_master_inst #(8'h0) axi4_master (
        .clk(clk),
        .reset(reset),
        .start(start),
        .arvalid(m_axi_arvalid),
        .araddr(m_axi_araddr),
        .arlen(m_axi_arlen),
        .arsize(m_axi_arsize),
        .arburst(m_axi_arburst),
        .arlock(m_axi_arlock),
        .arcache(m_axi_arcache),
        .arprot(m_axi_arprot),
        .arqos(m_axi_arqos),
        .arready(m_axi_arready),
        .rvalid(m_axi_rvalid),
        .rdata(m_axi_rdata),
        .rresp(m_axi_rresp),
        .rlast(m_axi_rlast),
        .rready(m_axi_rready),
        .awvalid(m_axi_awvalid),
        .awaddr(m_axi_awaddr),
        .awlen(m_axi_awlen),
        .awsize(m_axi_awsize),
        .awburst(m_axi_awburst),
        .awlock(m_axi_awlock),
        .awcache(m_axi_awcache),
        .awprot(m_axi_awprot),
        .awqos(m_axi_awqos),
        .awready(m_axi_awready),
        .wvalid(m_axi_wvalid),
        .wdata(m_axi_wdata),
        .wstrb(m_axi_wstrb),
        .wlast(m_axi_wlast),
        .wready(m_axi_wready)
    );

    //AXI4 Master模块实例化的输出端口连接
    assign done = axi4_master.done;
    assign data_out = axi4_master.read_data;

    //输入端口与AXI4 Master模块实例化的输入端口连接
    assign axi4_master.address = addr;
    assign axi4_master.write_data = data_in;

endmodule

需要注意的是，此代码需要在AXI4 Master模块的实例化中指定AXI4信号的位宽和地址宽度。在本例中，我们使用了一个字节地址宽度为8的AXI4接口。如果需要使用不同的位宽和地址宽度，请相应地更改模块实例化。