用verlog生成一个标准的AXI slave接口

以下是一个基本的AXI从设备接口的Verilog代码示例：

module axi_slave(
  input wire        clk,
  input wire        resetn,
  input wire [31:0] awaddr,
  input wire [2:0]  awprot,
  input wire [3:0]  awvalid,
  input wire        awready,
  input wire [31:0] wdata,
  input wire [3:0]  wstrb,
  input wire [3:0]  wvalid,
  input wire        wready,
  output reg [1:0]  bresp,
  output reg        bvalid,
  input wire        bready,
  input wire [31:0] araddr,
  input wire [2:0]  arprot,
  input wire [3:0]  arvalid,
  input wire        arready,
  output reg [31:0] rdata,
  output reg [1:0]  rresp,
  output reg        rvalid,
  input wire        rready
);

// Internal registers
reg [31:0] mem[1024];
reg [1:0]  bresp_reg;
reg        bvalid_reg;
reg [31:0] rdata_reg;
reg [1:0]  rresp_reg;
reg        rvalid_reg;

// Address decoding logic
assign bresp = bresp_reg;
assign bvalid = bvalid_reg;
assign rdata = rdata_reg;
assign rresp = rresp_reg;
assign rvalid = rvalid_reg;

always @(posedge clk) begin
  if (!resetn) begin
    bresp_reg <= 2'b00;
    bvalid_reg <= 1'b0;
    rdata_reg <= 32'h0;
    rresp_reg <= 2'b00;
    rvalid_reg <= 1'b0;
  end else begin
    if (awvalid && awready && wvalid && wready) begin
      // Write data transfer
      mem[awaddr[9:2]] <= wdata;
      bresp_reg <= 2'b00; // OKAY response
      bvalid_reg <= 1'b1;
    end else if (arvalid && arready) begin
      // Read data transfer
      rdata_reg <= mem[araddr[9:2]];
      rresp_reg <= 2'b00; // OKAY response
      rvalid_reg <= 1'b1;
    end
  end
end

endmodule

这个模块包括了AXI接口的所有必需信号，包括地址和数据传输。在这个示例中，数据存储在一个简单的32位数组内，地址位宽为10位。当写入传输完成时，从设备将返回OKAY响应。当读取传输完成时，从设备将返回请求的数据和OKAY响应。