DVP时序解析模块verilog

DVP时序解析模块（Digital Video Port Timing Parsing Module）是用于数字视频接口（Digital Video Port）的时序解析的模块。它将DVP时序信号进行解析，以获得各种视频信号的时序参数，如行数、场数、帧率、数据位宽等。

以下是一个简单的DVP时序解析模块的Verilog代码示例：

module dvp_timing_parser(
    input clk,
    input rstn,
    input dvp_pclk,
    input dvp_vsync,
    input dvp_href,
    output reg [11:0] hcount,
    output reg [10:0] vcount,
    output reg [1:0] field,
    output reg [6:0] data_width,
    output reg [31:0] pixel_count
);

reg [1:0] state;
reg [11:0] count;

parameter IDLE = 2'b00;
parameter HACTIVE = 2'b01;
parameter HBLANK = 2'b10;
parameter VSYNC = 2'b11;

always @(posedge clk or negedge rstn) begin
    if (!rstn) begin
        state <= IDLE;
        count <= 12'd0;
        hcount <= 12'd0;
        vcount <= 11'd0;
        field <= 2'd0;
        data_width <= 7'd0;
        pixel_count <= 32'd0;
    end else begin
        case (state)
            IDLE: begin
                if (dvp_vsync == 1'b0) begin
                    state <= VSYNC;
                    count <= 12'd0;
                end
            end
            VSYNC: begin
                if (dvp_vsync == 1'b1) begin
                    state <= HBLANK;
                    count <= 12'd0;
                end
            end
            HBLANK: begin
                if (dvp_href == 1'b1) begin
                    state <= HACTIVE;
                    count <= 12'd0;
                end
            end
            HACTIVE: begin
                if (dvp_href == 1'b0) begin
                    hcount <= count;
                    state <= HBLANK;
                    count <= 12'd0;
                    if (vcount == 10'd0) begin
                        field <= ~field;
                    end
                end else begin
                    count <= count + 12'd1;
                end
            end
        endcase
        if (state == VSYNC) begin
            vcount <= count;
        end
        if (dvp_pclk == 1'b0 && count == 12'd0) begin
            data_width <= 7'd0;
            pixel_count <= 32'd0;
        end else if (dvp_pclk == 1'b1 && count > 12'd0 && count < 12'd8) begin
            data_width <= dvp_data;
        end else if (dvp_pclk == 1'b1 && count >= 12'd8) begin
            pixel_count <= pixel_count + 32'd1;
        end
    end
end

endmodule

该模块通过有限状态机（FSM）的方式对DVP信号进行时序解析，得到各种视频信号的时序参数。其中，模块输入包括DVP的像素时钟（dvp_pclk）、垂直同步信号（dvp_vsync）和水平参考信号（dvp_href）等，输出包括行数（hcount）、场数（vcount）、帧率（field）、数据位宽（data_width）和像素计数（pixel_count）等。