ADS1000 的verilog程序

以下是ADS1000的Verilog程序示例：

module ADS1000 (
    input clk,
    input rst_n,
    input start_conv,
    input sclk,
    input din,
    output dout,
    output reg drdy
);

reg [15:0] data_reg;
reg [3:0] state;
reg [3:0] bit_cnt;
reg [3:0] conv_cnt;
reg [3:0] sclk_cnt;

parameter IDLE = 4'b0000;
parameter WRITE_CONFIG = 4'b0001;
parameter CONVERSION = 4'b0010;
parameter READ_DATA = 4'b0011;

parameter CLK_PERIOD = 10;

assign dout = data_reg[15];

always @(posedge clk or negedge rst_n) begin
    if (!rst_n) begin
        state <= IDLE;
        bit_cnt <= 4'h0;
        conv_cnt <= 4'h0;
        sclk_cnt <= 4'h0;
        data_reg <= 16'h0;
        drdy <= 1'b0;
    end else begin
        case (state)
            IDLE: begin
                if (start_conv) begin
                    state <= WRITE_CONFIG;
                    bit_cnt <= 4'h0;
                    data_reg[15:8] <= 8'h20; // write config register
                    data_reg[7:0] <= 8'h03; // set sampling rate to 100 SPS
                end
            end
            WRITE_CONFIG: begin
                sclk_cnt <= sclk_cnt + 1;
                if (sclk_cnt == 4'h8) begin
                    sclk_cnt <= 4'h0;
                    if (bit_cnt == 4'hF) begin
                        state <= CONVERSION;
                    end else begin
                        bit_cnt <= bit_cnt + 1;
                        data_reg[15:8] <= {data_reg[14:0],din};
                    end
                end
            end
            CONVERSION: begin
                conv_cnt <= conv_cnt + 1;
                if (conv_cnt == 4'h8) begin
                    conv_cnt <= 4'h0;
                    state <= READ_DATA;
                    sclk_cnt <= 4'h0;
                end
            end
            READ_DATA: begin
                sclk_cnt <= sclk_cnt + 1;
                if (sclk_cnt == 4'h8) begin
                    sclk_cnt <= 4'h0;
                    if (bit_cnt == 4'hF) begin
                        state <= IDLE;
                        drdy <= 1'b1;
                    end else begin
                        bit_cnt <= bit_cnt + 1;
                        data_reg[15:8] <= {data_reg[14:0],1'b0};
                    end
                end
            end
        endcase
    end
end

endmodule

这个程序是一个状态机，它实现了ADS1000的功能。在正常操作时，它从空闲状态开始，并等待一个启动转换信号。然后它会将配置寄存器写入芯片，并在转换完成后读取数据。在所有操作完成后，它将返回空闲状态。