gige通信协议的verilog代码

以下是一个简单的 GigE 通信协议的 Verilog 代码示例：

module gige_tx(
  input clk,
  input reset,
  input [7:0] mac_src[5:0], // Source MAC address
  input [7:0] mac_dest[5:0], // Destination MAC address
  input [15:0] ethertype, // EtherType
  input [7:0] data_in, // Data input
  input start_tx, // Start transmit
  output reg [7:0] mii_data_out, // MII data out
  output reg mii_en_out // MII enable out
);

  // State machine states
  parameter IDLE = 2'b00;
  parameter PREAMBLE = 2'b01;
  parameter SOF = 2'b10;
  parameter DATA = 2'b11;

  // State machine variables
  reg [1:0] state;
  reg [3:0] byte_cnt;
  reg [31:0] tx_data;
  reg [31:0] preamble;
  reg [31:0] sof;
  reg [31:0] mac_dest_reg;
  reg [31:0] mac_src_reg;
  reg [15:0] ethertype_reg;
  reg [7:0] data_in_reg;
  reg start_tx_reg;

  // Initialize variables on reset
  always @(posedge clk or posedge reset) begin
    if (reset) begin
      state <= IDLE;
      byte_cnt <= 0;
      tx_data <= 0;
      preamble <= 32'h55555555;
      sof <= {32'h55555555, 16'hAAAA};
      mac_dest_reg <= {mac_dest, 16'h0000};
      mac_src_reg <= {mac_src, 16'h0000};
      ethertype_reg <= ethertype;
      data_in_reg <= data_in;
      start_tx_reg <= start_tx;
    end else begin
      state <= state;
      byte_cnt <= byte_cnt;
      tx_data <= tx_data;
      preamble <= preamble;
      sof <= sof;
      mac_dest_reg <= mac_dest_reg;
      mac_src_reg <= mac_src_reg;
      ethertype_reg <= ethertype_reg;
      data_in_reg <= data_in_reg;
      start_tx_reg <= start_tx;
    end
  end

  // State machine
  always @(posedge clk) begin
    case(state)
      IDLE: begin
        if (start_tx_reg) begin
          state <= PREAMBLE;
          byte_cnt <= 0;
        end
      end
      PREAMBLE: begin
        tx_data <= preamble;
        byte_cnt <= byte_cnt + 1;
        if (byte_cnt == 7) begin
          state <= SOF;
          byte_cnt <= 0;
        end
      end
      SOF: begin
        tx_data <= sof;
        byte_cnt <= byte_cnt + 1;
        if (byte_cnt == 15) begin
          state <= DATA;
          byte_cnt <= 0;
        end
      end
      DATA: begin
        case(byte_cnt)
          0: tx_data <= mac_dest_reg[31:24];
          1: tx_data <= mac_dest_reg[23:16];
          2: tx_data <= mac_dest_reg[15:8];
          3: tx_data <= mac_dest_reg[7:0];
          4: tx_data <= mac_src_reg[31:24];
          5: tx_data <= mac_src_reg[23:16];
          6: tx_data <= mac_src_reg[15:8];
          7: tx_data <= mac_src_reg[7:0];
          8: tx_data <= ethertype_reg[15:8];
          9: tx_data <= ethertype_reg[7:0];
          default: tx_data <= data_in_reg;
        endcase
        byte_cnt <= byte_cnt + 1;
        if (byte_cnt == 1500) begin
          state <= IDLE;
          byte_cnt <= 0;
        end
      end
    endcase
  end

  // MII interface
  always @(posedge clk) begin
    case(state)
      IDLE: begin
        mii_data_out <= 8'h00;
        mii_en_out <= 0;
      end
      PREAMBLE: begin
        mii_data_out <= tx_data[31:24];
        mii_en_out <= 1;
      end
      SOF: begin
        mii_data_out <= tx_data[31:24];
        mii_en_out <= 1;
      end
      DATA: begin
        mii_data_out <= tx_data[31:24];
        mii_en_out <= 1;
      end
    endcase
  end

endmodule

这个代码实现了一个 GigE 发送器，它将数据从输入端口发送到 MII 接口。它使用一个状态机来控制发送过程，并根据 GigE 协议格式对数据进行编码和封装。请注意，这只是一个简单的示例，实际的 GigE 实现可能需要更复杂的逻辑和协议支持。