Isochronous transfer (synchronous transmission) used in the large amount of data, real-time high demanding applications, such as audio equipment, video equipment, etc., that are sensitive to data delay, for audio and video equipment, the 100% correct data less demanding, a small amount of data errors can tolerate that, the main thing is to ensure that does not stop; it does not guarantee the isochronous data transfer is 100% correct. When a data error, the retransmission operation is not performed. Therefore, when there is no response packet transmission and so on. Whether the data is correct can be confirmed by the CRC check packet. As for how to deal with erroneous data, determined by the software. Transaction data is transmitted using isochronous transfer.
