一个完整的sdi编解码的verilog实现

SDI（Serial Digital Interface）是一种用于数字视频信号传输的标准接口，常用于广播、电视制作和视频监控等领域。SDI包括SD-SDI、HD-SDI、3G-SDI等多种规格，其中最常见的是HD-SDI。

下面是一个简单的SDI编解码的Verilog实现，包括SDI接收端和发送端。该实现仅支持HD-SDI规格，即1.485Gbps的传输速率。

SDI接收端：

module sdi_rx (
    input clk,
    input rst,
    input sdi_in,
    output reg [9:0] data_out,
    output reg [2:0] ctrl_out,
    output reg err_out
);

parameter IDLE = 3'd0;
parameter HEADER = 3'd1;
parameter DATA = 3'd2;
parameter PARITY = 3'd3;

reg [2:0] state;
reg [9:0] data_reg;
reg [2:0] ctrl_reg;
reg [9:0] crc_reg;
reg crc_en;
reg [4:0] crc_cnt;
reg crc_err;

always @(posedge clk or posedge rst) begin
    if (rst) begin
        state <= IDLE;
        data_reg <= 0;
        ctrl_reg <= 0;
        crc_reg <= 0;
        crc_en <= 0;
        crc_cnt <= 0;
        crc_err <= 0;
        err_out <= 0;
    end else begin
        case (state)
            IDLE: begin
                if (sdi_in == 1'b0) begin
                    state <= HEADER;
                    crc_en <= 1;
                    crc_cnt <= 4;
                end
            end
            HEADER: begin
                data_reg <= {data_reg[7:0], sdi_in};
                ctrl_reg <= {ctrl_reg[1:0], sdi_in};
                if (ctrl_reg == 3'b000) begin
                    state <= DATA;
                    crc_en <= 1;
                    crc_cnt <= 10;
                end else if (ctrl_reg == 3'b010) begin
                    state <= PARITY;
                    crc_en <= 1;
                    crc_cnt <= 10;
                end else if (ctrl_reg == 3'b101) begin
                    state <= IDLE;
                    if (crc_reg == 10'd0 && crc_err == 0) begin
                        data_out <= data_reg;
                        ctrl_out <= ctrl_reg;
                    end else begin
                        err_out <= 1;
                    end
                end else begin
                    state <= IDLE;
                    err_out <= 1;
                end
            end
            DATA: begin
                data_reg <= {data_reg[7:0], sdi_in};
                ctrl_reg <= {ctrl_reg[1:0], sdi_in};
                if (crc_en) begin
                    crc_reg <= crc_reg ^ {2'b00, sdi_in};
                    crc_cnt <= crc_cnt - 1;
                    if (crc_cnt == 0) begin
                        crc_en <= 0;
                        crc_cnt <= 4;
                    end
                end
                if (ctrl_reg == 3'b101) begin
                    state <= IDLE;
                    if (crc_reg == 10'd0 && crc_err == 0) begin
                        data_out <= data_reg;
                        ctrl_out <= ctrl_reg;
                    end else begin
                        err_out <= 1;
                    end
                end
            end
            PARITY: begin
                if (sdi_in == crc_err) begin
                    crc_err <= 1;
                end
                if (crc_en) begin
                    crc_reg <= crc_reg ^ {2'b00, sdi_in};
                    crc_cnt <= crc_cnt - 1;
                    if (crc_cnt == 0) begin
                        crc_en <= 0;
                        crc_cnt <= 4;
                    end
                end
                if (ctrl_reg == 3'b101) begin
                    state <= IDLE;
                    if (crc_reg == 10'd0 && crc_err == 0) begin
                        data_out <= data_reg;
                        ctrl_out <= ctrl_reg;
                    end else begin
                        err_out <= 1;
                    end
                end
            end
        endcase
    end
end

endmodule

SDI发送端：

module sdi_tx (
    input clk,
    input rst,
    input [9:0] data_in,
    input [2:0] ctrl_in,
    output reg sdi_out
);

parameter IDLE = 3'd0;
parameter HEADER = 3'd1;
parameter DATA = 3'd2;
parameter PARITY = 3'd3;

reg [2:0] state;
reg [9:0] data_reg;
reg [2:0] ctrl_reg;
reg [9:0] crc_reg;
reg crc_en;
reg [4:0] crc_cnt;

always @(posedge clk or posedge rst) begin
    if (rst) begin
        state <= IDLE;
        data_reg <= 0;
        ctrl_reg <= 0;
        crc_reg <= 0;
        crc_en <= 0;
        crc_cnt <= 0;
    end else begin
        case (state)
            IDLE: begin
                sdi_out <= 1'b1;
                if (ctrl_in == 3'b000) begin
                    state <= HEADER;
                    crc_en <= 1;
                    crc_cnt <= 4;
                end
            end
            HEADER: begin
                sdi_out <= ctrl_reg[2];
                data_reg <= {data_reg[7:0], sdi_out};
                ctrl_reg <= {ctrl_reg[1:0], sdi_out};
                if (ctrl_reg == 3'b000) begin
                    state <= DATA;
                    crc_en <= 1;
                    crc_cnt <= 10;
                end else if (ctrl_reg == 3'b010) begin
                    state <= PARITY;
                    crc_en <= 1;
                    crc_cnt <= 10;
                end else if (ctrl_reg == 3'b101) begin
                    state <= IDLE;
                end else begin
                    state <= IDLE;
                end
            end
            DATA: begin
                sdi_out <= data_reg[9];
                data_reg <= {data_reg[7:0], data_in[0]};
                ctrl_reg <= {ctrl_reg[1:0], data_in[1]};
                if (crc_en) begin
                    crc_reg <= crc_reg ^ {2'b00, sdi_out};
                    crc_cnt <= crc_cnt - 1;
                    if (crc_cnt == 0) begin
                        crc_en <= 0;
                        crc_cnt <= 4;
                    end
                end
                if (ctrl_in == 3'b101) begin
                    state <= HEADER;
                    crc_en <= 1;
                    crc_cnt <= 4;
                end
            end
            PARITY: begin
                sdi_out <= crc_reg[9];
                if (crc_en) begin
                    crc_reg <= crc_reg ^ {2'b00, sdi_out};
                    crc_cnt <= crc_cnt - 1;
                    if (crc_cnt == 0) begin
                        crc_en <= 0;
                        crc_cnt <= 4;
                    end
                end
                if (ctrl_in == 3'b101) begin
                    state <= HEADER;
                    crc_en <= 1;
                    crc_cnt <= 4;
                end
            end
        endcase
    end
end

endmodule

以上是一个简单的SDI编解码的Verilog实现，仅供参考。实际应用中，需要考虑更多的细节和特殊情况。