SATA控制器FPGA代码

SATA控制器的FPGA代码涉及到硬件描述语言，通常使用Verilog或VHDL来实现。下面是一个简单的Verilog代码示例，用于实现SATA控制器的基本功能：

module sata_controller(
    input clk,
    input rst,
    input [31:0] data_in,
    input [7:0] cmd_in,
    output [31:0] data_out,
    output [7:0] cmd_out,
    output [7:0] status
);

// Internal registers
reg [31:0] data_reg;
reg [7:0] cmd_reg;
reg [7:0] status_reg;

// State machine
reg [2:0] state;

// Constants
parameter IDLE = 3'd0;
parameter READ = 3'd1;
parameter WRITE = 3'd2;

// Reset the state machine and internal registers
always @(posedge clk) begin
    if (rst) begin
        state <= IDLE;
        data_reg <= 0;
        cmd_reg <= 0;
        status_reg <= 0;
    end
end

// State machine logic
always @(posedge clk) begin
    case (state)
        IDLE: begin
            cmd_reg <= cmd_in;
            if (cmd_in[7] == 1'b0) begin
                state <= READ;
            end else begin
                state <= WRITE;
                data_reg <= data_in;
            end
        end
        READ: begin
            data_out <= read_data_from_sata();
            status_reg <= get_status_from_sata();
            state <= IDLE;
        end
        WRITE: begin
            write_data_to_sata(data_reg);
            status_reg <= get_status_from_sata();
            state <= IDLE;
        end
    endcase
end

// Output logic
assign cmd_out = cmd_reg;
assign status = status_reg;

endmodule

请注意，这是一个非常简单的示例，并且可能需要根据具体应用进行修改。此外，这里只是一个Verilog代码示例，如果使用VHDL则语法会有所不同。