该FIFO应当提供用户读使能和写使能输入控制信号，并输出指示FIFO状态的非空和非满信号，FIFO的输入、输出数据使各自的数据总线：in_data和out_data。-The FIFO should be provided to enable users to read and write enable input control signal, and outputs instructions FIFO status signals of non-empty and non-full, FIFO input and output data to make their respective data bus: in_data and out_data.