| 摘要 |
PURPOSE:To realize a common bus using system with a low cost circuit constitution by connecting plural processors to a common bus by a bidirectional or a single direction gate in parallel and providing a control part for opening and closing the gate at a certain cycle. CONSTITUTION:The bidirectional gate 8 is used between the common bus 13 and the processors 1-4 to connect them. A bus controller 7 is operated at a timing synchronizing with the processor to control the four processors by the combination of signals INT1, INT0 and apply a common bus use permitting signal. At the same timing, a common bus control signal (GATE signal) is transmitted to attain a control by opening and closing the bidirectional gate. IN such a way, the common bus using system is realized with the compact circuit constitution and the low cost by a few bus signal lines and control elements to many processors. |
