| 摘要 |
PCT No. PCT/IB94/00250 Sec. 371 Date Apr. 17, 1995 Sec. 102(e) Date Apr. 17, 1995 PCT Filed Aug. 15, 1995 PCT Pub. No. WO95/05636 PCT Pub. Date Feb. 23, 1995A multistation single-channel communication bus system accommodating master stations and slave stations, with any master performing arbitration, arbitration outcome detection, and, upon winning the arbitration, formatting a frame having a slave address and slave control signals, and accommodating data byte periods for data transmission from a transmitter station to a receiver station up to a first maximum data byte length. Each period accommodating an acknowledge bit from the receiver station. The transmitter station responding to the absence of the acknowledge bit for a particular data byte by repeating that data byte. The system, for a message whose data byte length would exceed the first maximum, divides the message into partial messages each of an associated frame data byte count below the first maximum, and assigns each partial message to a respective bus frame. The system counts, in a particular frame, data byte periods and received acknowledge bits. The transmitter station, upon attaining the first maximum earlier by the data byte periods than the frame data byte count by the acknowledge bits, signalling a frame failure and ignoring any transfer in the particular frame for undertaking a repeat thereof. |
