interface if_dd();

    logic hard_reset;
    logic cmd_request;
    logic cmd_ack;
    logic [7:0] command;
    logic [15:0] status;
    logic [15:0] data_input;
    logic [15:0] data_output;
    logic bm_request;
    logic [15:0] bm_control;
    logic [15:0] bm_status;

    modport n64 (
        output hard_reset,
        output cmd_request,
        input cmd_ack,
        output command,
        input status,
        output data_input,
        input data_output,
        output bm_request,
        output bm_control,
        input bm_status
    );

    modport cpu (
        input hard_reset,
        input cmd_request,
        output cmd_ack,
        input command,
        output status,
        input data_input,
        output data_output,
        input bm_request,
        input bm_control,
        output bm_status
    );

endinterface