avalon总线主设备代码

Avalon总线主设备代码通常涉及到FPGA设计。在Quartus Prime软件中使用Verilog或VHDL语言进行编程。下面是一个使用Verilog的Avalon总线主设备代码示例：

module avalon_master(
  input clk,
  input rst,
  input [31:0] write_data,
  input [31:0] read_addr,
  output reg [31:0] read_data,
  output reg [1:0] burst_count,
  output reg [31:0] address,
  output reg read,
  output reg write,
  output reg waitrequest
);

  // Avalon Master Interface Signals
  assign read_data = 0;
  assign burst_count = 0;

  // Control signals
  reg [3:0] state;
  wire ack;
  wire [31:0] data;

  // State machine
  always @(posedge clk or negedge rst) begin
    if (~rst) begin
      state <= 4'b0000;
      address <= 0;
      read <= 0;
      write <= 0;
      waitrequest <= 0;
    end
    else begin
      case (state)
        4'b0000: begin // Idle
          if (write) begin
            state <= 4'b0001;
            address <= read_addr;
            data <= write_data;
          end
          else if (read) begin
            state <= 4'b0010;
            address <= read_addr;
          end
        end
        4'b0001: begin // Write
          if (ack) begin
            state <= 4'b0000;
            address <= 0;
            write <= 0;
            waitrequest <= 0;
          end
          else begin
            waitrequest <= 1;
          end
        end
        4'b0010: begin // Read
          if (ack) begin
            state <= 4'b0000;
            address <= 0;
            read <= 0;
            waitrequest <= 0;
            read_data <= data;
          end
          else begin
            waitrequest <= 1;
          end
        end
        default: state <= 4'b0000;
      endcase
    end
  end

  // Avalon Master Interface
  assign address = address;
  assign read = read;
  assign write = write;
  assign waitrequest = waitrequest;
  assign data = read_data;

  // Write and read signals
  always @(posedge clk or negedge rst) begin
    if (~rst) begin
      write <= 0;
      read <= 0;
    end
    else begin
      if (burst_count == 2'b00) begin
        write <= 1;
        read <= 0;
      end else if (burst_count == 2'b10) begin
        write <= 0;
        read <= 1;
      end else begin
        write <= 0;
        read <= 0;
      end
    end
  end

endmodule

需要注意的是，这只是一个简单的示例代码，实际上Avalon总线主设备代码会更复杂，因为它需要处理更多的控制信号和状态机。