| 摘要 |
PROBLEM TO BE SOLVED: To reduce the memory capacity of a buffer memory. SOLUTION: A differential calculating circuit 22 acquires the held data amount of a correspondent buffer memory 4 at intervals of a fixed time, finds a differential from the last data amount and provides a bit rate during a relevant period. According to this bit rate, a priority change circuit 24 sets the higher priority to the buffer memory 4 of the higher bit rate. On the basis of this set priority, an arbitration circuit 18 selects the buffer memory 4. Therefore, the high priority is dynamically set to the buffer memory 4 to which data is frequently inputted at the time of operation, the wait time of such a buffer memory is shortened and the held data can be frequently outputted. As a result, even when memory capacity is small, overflow does not occur and the memory capacity of the buffer memory 4 can be reduced.
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