| 摘要 |
The format of the transmission of isochronous data packets via the IEEE 1394 bus is defined in the IEC 61883 Standard. In this case, it is possible to use an operating mode in which the same number of data blocks (DB0-DB7) is always transmitted in a bus packet. In this case, the memory management is extremely simple and the data source packet boundaries can easily be determined. However, the IEC 61883 standard also leaves open the possibility of transmitting a variable number of data blocks (DB0-DB7) in the context of isochronous data transmission with the aid of bus packets. In this case, however, subsequently ascertaining the data source packet boundaries poses a problem. The invention specifies a solution, favourable in terms of outlay, as to how the data source packet boundaries can easily be reconstructed. It is based essentially on modulo-n counting of data blocks (DB0-DB7). |
