ARINC818_FILE

module ARINC818_FILE(
    input clk,
    input rst_n,
    input [31:0] container_cnt,    // 容器计数
    input [15:0] advb_frame_cnt,   // advb帧计数
    input advb_frame_last,          // ADVB最后一帧
    input [15:0] img_width,         // 图像宽度
    input [15:0] img_high,          // 图像高度

    output reg [31:0] sofi,        // 首帧起始定界符
    output reg [31:0] sofn,        // 非首帧起始定界符
    output reg [31:0] eofn,        // 非最后帧结束定界符
    output reg [31:0] eoft,        // 最后帧结束定界符
    output reg [31:0] advb_idle,   // advb帧间隙字符

    output reg [31:0] frame_words0_r_ctl,
    output reg [31:0] frame_words0_dst_id,
    output reg [31:0] frame_words1_cs_ctl,
    output reg [31:0] frame_words1_src_id,
    output reg [31:0] frame_words2_type,
    output reg [31:0] frame_words2_f_ctl,
    output reg [31:0] frame_words3_seq_id,
    output reg [31:0] frame_words3_df_ctl,
    output reg [31:0] frame_words3_seq_cnt,
    output reg [31:0] frame_words4_OX_RX_ID,
    output reg [31:0] frame_words5_parameter,
    output reg [31:0] container_words0_cnt,
    output reg [31:0] container_words1_id,
    output reg [31:0] container_words2_time,
    output reg [31:0] container_words3_time,
    output reg [31:0] container_words4_fps,
    output reg [31:0] container_words4_rate
);

    // K28.5, D21.5, D22.2编码示例（ARINC 818协议定义的字符编码）
    localparam [7:0] K28_5 = 8'hBC; // 示例码，真实协议确认
    localparam [7:0] D21_5 = 8'h95;
    localparam [7:0] D22_2 = 8'hB5;
    localparam [31:0] SOFI_VAL = {K28_5, D21_5, D22_2, D22_2};
    localparam [31:0] SOFN_VAL = {K28_5, D21_5, D21_5, D22_2};
    localparam [31:0] EOFN_VAL = {K28_5, D22_2, D21_5, D21_5};
    localparam [31:0] EOFT_VAL = {K28_5, D22_2, D22_2, D21_5};
    localparam [31:0] ADVB_IDLE_VAL = 32'hBC95_B5B5;  // 休止符

    // 初始化和状态更新
    always @(posedge clk or negedge rst_n) begin
        if (!rst_n) begin
            sofi <= SOFI_VAL;
            sofn <= SOFN_VAL;
            eofn <= EOFN_VAL;
            eoft <= EOFT_VAL;
            advb_idle <= ADVB_IDLE_VAL;

            // 这里frame_words*和container_words*初始化为0或默认值
            frame_words0_r_ctl <= 32'd0;
            frame_words0_dst_id <= 32'd0;
            frame_words1_cs_ctl <= 32'd0;
            frame_words1_src_id <= 32'd0;
            frame_words2_type <= 32'd0;
            frame_words2_f_ctl <= 32'd0;
            frame_words3_seq_id <= 32'd0;
            frame_words3_df_ctl <= 32'd0;
            frame_words3_seq_cnt <= 32'd0;
            frame_words4_OX_RX_ID <= 32'd0;
            frame_words5_parameter <= 32'd0;
            container_words0_cnt <= 32'd0;
            container_words1_id <= 32'd0;
            container_words2_time <= 32'd0;
            container_words3_time <= 32'd0;
            container_words4_fps <= 32'd0;
            container_words4_rate <= 32'd0;
        end else begin
            // 根据advb_frame_last控制使用SOFI或SOFN
            sofi <= advb_frame_last ? SOFI_VAL : sofi;
            sofn <= (!advb_frame_last) ? SOFN_VAL : sofn;
            eofn <= (!advb_frame_last) ? EOFN_VAL : eofn;
            eoft <= advb_frame_last ? EOFT_VAL : eoft;

            // 赋值frame_words，示例根据计数器简单赋值，可根据协议详细填写
            frame_words0_r_ctl <= {16'd0, advb_frame_cnt};      // 示例：下16位为帧计数
            frame_words0_dst_id <= 32'h0000_0001;              // 目的ID示例
            frame_words1_cs_ctl <= 32'h0000_0000;               // 控制字段示例
            frame_words1_src_id <= 32'h0000_0002;               // 源ID示例
            frame_words2_type <= 32'h0000_0001;                 // 帧类型示例
            frame_words2_f_ctl <= 32'h0000_0000;                // 帧控制示例
            frame_words3_seq_id <= 32'h0000_0000;                // 序列ID示例
            frame_words3_df_ctl <= 32'h0000_0000;                // DF控制示例
            frame_words3_seq_cnt <= {16'd0, advb_frame_cnt};    // 序列计数示例
            frame_words4_OX_RX_ID <= 32'h0000_0000;             // OX/RX示例
            frame_words5_parameter <= {img_width, img_high};     // 图片分辨率打包示例

            // 容器相关信息直接赋值
            container_words0_cnt <= container_cnt;
            container_words1_id <= 32'h0000_0001;              // 容器ID示例
            container_words2_time <= 32'd0;                      // 时间戳示例
            container_words3_time <= 32'd0;                      // 时间戳示例
            container_words4_fps <= 32'd60;                      // 帧率示例
            container_words4_rate <= 32'd1000;                   // 码率示例
        end
    end

endmodule