| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a master/slave synchronous communication system capable of making a communication cycle long in accordance with the number of stations (communication load), wherein jitter does not occur at a synchronizing point of the communication cycle and performing transmission scheduling so as to transmit data after a prescribed period of time from the synchronizing point. <P>SOLUTION: This master/slave synchronous communication system has the communication cycle set to an integral multiple of a unique cycle of IEEE1394 communication with the unique cycle considered as a base cycle, and each station has a detecting means for a synchronizing point being starting timing of a communication cycle and a base cycle counter (counter value has the same value in all stations after detecting synchronizing point) showing what base cycle number the present cycle is from the synchronizing point. A master transmits a command to each slave on the basis of a transmission management table preallocated to each corresponding base cycle counter value, and each slave transmits response data to the master on the basis of transmission timing information with the base cycle counter value for transmitting response set therein. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
