cameralink 接收数据Verilog代码

以下是一个简单的 CameraLink 接收器的 Verilog 代码示例：

module cameralink_receiver (
  input clk,
  input reset,
  input data_in,
  input clkp,
  input clkn,
  output reg [7:0] pixel_out,
  output reg [1:0] status_out
);

// CameraLink receiver state machine states
parameter IDLE = 2'b00;
parameter HEADER = 2'b01;
parameter DATA = 2'b10;
parameter FOOTER = 2'b11;

// CameraLink receiver state machine signals
reg [1:0] state;
reg header_valid;
reg [3:0] header_count;
reg [7:0] pixel_count;
reg [3:0] footer_count;

// CameraLink receiver register definitions
reg [7:0] header [8:0];
reg [7:0] pixel [7:0];
reg [1:0] status;
reg [7:0] crc;

// CameraLink receiver constants
parameter HEADER_SYNC = 8'hAC; // CameraLink header sync byte
parameter FOOTER_SYNC = 8'hAD; // CameraLink footer sync byte
parameter HEADER_LENGTH = 3;   // CameraLink header length in bytes
parameter FOOTER_LENGTH = 4;   // CameraLink footer length in bytes

// CameraLink receiver state machine
always @(posedge clk or posedge reset) begin
  if (reset) begin
    state <= IDLE;
    header_valid <= 0;
    header_count <= 0;
    pixel_count <= 0;
    footer_count <= 0;
  end else begin
    case (state)
      IDLE: begin
        pixel_out <= 0;
        status_out <= 0;
        if (data_in == HEADER_SYNC) begin
          header_valid <= 1;
          header_count <= 0;
          crc <= 0;
          state <= HEADER;
        end
      end
      HEADER: begin
        header[header_count] <= data_in;
        header_count <= header_count + 1;
        if (header_count == HEADER_LENGTH) begin
          header_valid <= 0;
          state <= DATA;
        end
      end
      DATA: begin
        if (pixel_count < 8) begin
          pixel[pixel_count] <= data_in;
          pixel_count <= pixel_count + 1;
        end else begin
          crc <= crc ^ pixel[7];
          for (int i = 6; i >= 0; i = i - 1)
            crc <= crc ^ ((crc & 0x80) ? 0x09 : 0);
          pixel_out <= pixel;
          status_out <= status;
          pixel_count <= 0;
          if (data_in == FOOTER_SYNC) begin
            state <= FOOTER;
          end
        end
      end
      FOOTER: begin
        if (footer_count < FOOTER_LENGTH) begin
          crc <= crc ^ data_in;
          footer_count <= footer_count + 1;
        end else begin
          if (crc == 0) begin
            status <= 2'b10; // CameraLink frame received without errors
          end else begin
            status <= 2'b01; // CameraLink frame received with errors
          end
          state <= IDLE;
        end
      end
    endcase
  end
end

// CameraLink receiver clock data recovery
always @(posedge clk) begin
  status <= {status[0], clkp & clkn};
end

endmodule

这个例子实现了一个简单的 CameraLink 接收器，包括一个状态机和时钟数据恢复电路。该模块通过输入时钟和数据信号，输出像素数据和状态信号。请注意，此代码仅用于示例目的，实际实现可能需要更多的功能和细节处理。