brief introduction: The IEEE1394 standard, developed by the Institute of Electrical and Electronics Engineers (IEEE), is a serial interface, but it provides the same services as the parallel SCSI interface at low cost.It is characterized by high transmission speed, suitable for transmitting digital image signal.The transmission of 1394 interface is realized by layered protocol, which is divided into physical layer, link layer and processing layer.Four of the six pins are signal lines for data transmission and the o