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 clock,
  input reset,
  input [7:0] data_in,
  output [7:0] mac_out,
  output tx_en
);

  // 定义状态机状态
  parameter IDLE = 2'b00;
  parameter PREAMBLE = 2'b01;
  parameter SFD = 2'b10;
  parameter PAYLOAD = 2'b11;

  // 定义状态机信号
  reg [1:0] state = IDLE;
  reg [7:0] preamble = 8'h55;
  reg [7:0] sfd = 8'hD5;
  reg [31:0] frame;
  reg [31:0] crc;

  // 定义计数器和标志位
  reg [3:0] byte_cnt;
  reg preamble_sent;
  reg sfd_sent;
  reg payload_sent;

  // 定义 CRC 生成器模块
  crc_generator crc_gen(
    .data_in(frame),
    .crc_out(crc)
  );

  // 定义状态机
  always @ (posedge clock) begin
    if (reset) begin
      state <= IDLE;
      byte_cnt <= 0;
      preamble_sent <= 0;
      sfd_sent <= 0;
      payload_sent <= 0;
      mac_out <= 8'h00;
      tx_en <= 0;
    end else begin
      case (state)
        IDLE: begin
          if (data_in != 8'h00) begin
            state <= PREAMBLE;
          end else begin
            mac_out <= 8'h00;
            tx_en <= 0;
          end
        end
        PREAMBLE: begin
          if (!preamble_sent) begin
            mac_out <= preamble;
            tx_en <= 1;
            byte_cnt <= byte_cnt + 1;
            if (byte_cnt == 7) begin
              preamble_sent <= 1;
              byte_cnt <= 0;
            end
          end else begin
            state <= SFD;
            byte_cnt <= 0;
          end
        end
        SFD: begin
          if (!sfd_sent) begin
            mac_out <= sfd;
            tx_en <= 1;
            byte_cnt <= byte_cnt + 1;
            if (byte_cnt == 7) begin
              sfd_sent <= 1;
              byte_cnt <= 0;
            end
          end else begin
            state <= PAYLOAD;
            byte_cnt <= 0;
          end
        end
        PAYLOAD: begin
          if (!payload_sent) begin
            mac_out <= frame[byte_cnt*8 +: 8];
            tx_en <= 1;
            byte_cnt <= byte_cnt + 1;
            if (byte_cnt == 3) begin
              payload_sent <= 1;
              byte_cnt <= 0;
            end
          end else begin
            mac_out <= crc[byte_cnt*8 +: 8];
            tx_en <= 1;
            byte_cnt <= byte_cnt + 1;
            if (byte_cnt == 3) begin
              state <= IDLE;
              byte_cnt <= 0;
              preamble_sent <= 0;
              sfd_sent <= 0;
              payload_sent <= 0;
              mac_out <= 8'h00;
              tx_en <= 0;
            end
          end
        end
      endcase
    end
  end

endmodule

module gige_rx(
  input clock,
  input reset,
  input [7:0] mac_in,
  input rx_dv,
  output reg [7:0] data_out
);

  // 定义状态机状态
  parameter IDLE = 2'b00;
  parameter PREAMBLE = 2'b01;
  parameter SFD = 2'b10;
  parameter PAYLOAD = 2'b11;

  // 定义状态机信号
  reg [1:0] state = IDLE;
  reg [7:0] preamble = 8'h55;
  reg [7:0] sfd = 8'hD5;
  reg [31:0] frame;
  reg [31:0] crc;

  // 定义计数器和标志位
  reg [3:0] byte_cnt;
  reg preamble_detected;
  reg sfd_detected;
  reg payload_detected;

  // 定义 CRC 验证模块
  crc_verifier crc_verif(
    .data_in(frame),
    .crc_in(crc),
    .crc_valid(crc_valid)
  );

  // 定义状态机
  always @ (posedge clock) begin
    if (reset) begin
      state <= IDLE;
      byte_cnt <= 0;
      preamble_detected <= 0;
      sfd_detected <= 0;
      payload_detected <= 0;
      data_out <= 8'h00;
    end else begin
      case (state)
        IDLE: begin
          if (rx_dv && mac_in == preamble) begin
            state <= PREAMBLE;
            preamble_detected <= 1;
            byte_cnt <= 0;
          end
        end
        PREAMBLE: begin
          if (rx_dv && mac_in == sfd) begin
            state <= SFD;
            sfd_detected <= 1;
            byte_cnt <= 0;
          end else if (!rx_dv) begin
            state <= IDLE;
            preamble_detected <= 0;
          end
        end
        SFD: begin
          if (rx_dv) begin
            frame[byte_cnt*8 +: 8] <= mac_in;
            byte_cnt <= byte_cnt + 1;
            if (byte_cnt == 3) begin
              state <= PAYLOAD;
              payload_detected <= 1;
              byte_cnt <= 0;
            end
          end else begin
            state <= IDLE;
            preamble_detected <= 0;
            sfd_detected <= 0;
          end
        end
        PAYLOAD: begin
          if (rx_dv) begin
            frame[byte_cnt*8 +: 8] <= mac_in;
            byte_cnt <= byte_cnt + 1;
            if (byte_cnt == 3) begin
              state <= IDLE;
              payload_detected <= 0;
              byte_cnt <= 0;
              data_out <= frame[0:7];
            end
          end else begin
            state <= IDLE;
            preamble_detected <= 0;
            sfd_detected <= 0;
            payload_detected <= 0;
          end
        end
      endcase
    end
  end

endmodule

该代码包含了一个 GigE 通信协议的发送端和接收端。发送端负责将数据帧转换成 GigE 协议格式并发送，接收端负责接收 GigE 协议格式的数据帧并将其转换回原始数据帧。该代码仅作为示例，实际应用中可能需要根据具体需求进行修改。