| 摘要 |
PURPOSE:To improve a use efficiency of an interface by sending out a signal for showing message holding, to the second device from the first device, before releasing a reception informing signal to a message for informing a processing end. CONSTITUTION:Central processors 1, 2 are connected to input/output control devices 3-5 by an interface 6. When the input/output control device 3 requests to receive a message, to the central processor 1, the central processor 1 returns a response signal to the input/output control device 3. The input/output control device 3 requests to transmit a message, to the central processor 1. In response to its request, the central processor 1 sends out a message to a data bus. |
