| 摘要 |
PURPOSE:To obtain a rational and efficient access procedure by omitting access to a bus to which no channel is connected. CONSTITUTION:Channels 4(0)-4(n) are connected to one CPU1 through an asynchronous bus 2, and channels 5(0)-5(n) are connected through a synchronous bus 3. Further, a means which informs the CPU1 that the channels 4(0)-4(n) and 5(0)-5(n) are not connected to buses 2 and 3 having a specific priority procedure is provided. When there is information on that, the CPU1 omits access to the buses. |
