ddr3的verilog驱动代码

以下是一个简单的DDR3的Verilog驱动代码的例子：

module ddr3_controller (
    input clk,
    input reset,
    input [13:0] address,
    input [63:0] write_data,
    input write_enable,
    output reg [63:0] read_data
);

reg [1:0] state;
reg [3:0] bank;
reg [2:0] row;
reg [7:0] column;
reg [7:0] data_in;
reg [7:0] data_out;
reg [2:0] cas_latency;
reg [1:0] burst_count;

// Initialize state machine to idle state
initial state = 0;

always @(posedge clk) begin
    if (reset) begin
        state <= 0;
        bank <= 0;
        row <= 0;
        column <= 0;
        data_out <= 0;
        cas_latency <= 0;
        burst_count <= 0;
        read_data <= 0;
    end else begin
        case (state)
            0: begin // Idle state
                if (write_enable) begin
                    state <= 1;
                    bank <= address[13:11];
                    row <= address[10:0];
                    column <= address[9:3];
                    data_in <= write_data[7:0];
                end else if (address[13:3] != {bank, row, column}) begin
                    state <= 2;
                    bank <= address[13:11];
                    row <= address[10:0];
                    column <= address[9:3];
                    cas_latency <= 0;
                    burst_count <= 0;
                end
            end
            1: begin // Write state
                data_out <= {data_out[55:0], data_in};
                if (burst_count == 3) begin
                    state <= 0;
                end else begin
                    state <= 1;
                    column <= column + 1;
                    data_in <= write_data[(burst_count+1)*8-1:burst_count*8];
                    burst_count <= burst_count + 1;
                end
            end
            2: begin // Read state
                cas_latency <= cas_latency + 1;
                if (cas_latency == 5) begin
                    data_out <= read_data;
                    if (burst_count == 3) begin
                        state <= 0;
                    end else begin
                        state <= 2;
                        column <= column + 1;
                        cas_latency <= 0;
                        burst_count <= burst_count + 1;
                    end
                end
            end
        endcase
    end
end

// DDR3 memory model (not shown)
// ...

endmodule

上述代码只是一个简单的例子，实际的DDR3控制器需要更复杂的逻辑来支持不同的时序和操作。