| 摘要 |
PURPOSE:To satisfy the distributed processing request easily with a simple circuit constitution, by arranging distributively simple control means at each function block, providing a common control line for setting the right of using of the common bus and controlling the common bus. CONSTITUTION:A circuit block Bi is connected to a common bus A and a control line L is connected to a power supply Vcc as the 1st voltage level via a resistor R. An output circuit 1 comprises a transistor (TR) 7, the TR 7 shows a high output characteristic at nonoperating state and shows a ground potential as the 2nd voltage level at the operating state. An input circuit 6 consists of an AND gate 3. A controller is arranged at each block Bi and the control of a bus A is performed with the control line L for the setting of the right of using the bus A allowing to simplify the circuit constitution and to match the request of the distributed processing easily. |
