| 摘要 |
PURPOSE:To prevent the collision of block transfer requests of respective processors, by adding a dummy block transfer request outputting function to each processor connected to a data transfer bus. CONSTITUTION:A block transfer request output part of each processor is provided with a block transfer request output time generating part 23 which outputs a block transfer request output timing signal 104 and a dummy block transfer request generating part 26. If a block transfer request is not outputted over a long time, the generating part 26 outputs a dummy block transfer request. Then, a frequency divider 22 is initialized even if the block transfer request is not outputted for a certain time, and the lag of the block transfer request output time is held down within a certain time to prevent the collision of block transfer requests. Thus, the collision of block transfer requests of respective processors is prevented. |
