| 摘要 |
PURPOSE:To prevent malfunction due to a permission signal for use of an old bus despite the continuous bus requesting for a system containing an arranging device for the competition of bus requests, by adding a simple element to each data processor. CONSTITUTION:Each data processor PU contains an R-SFFd and an AND gate AG in addition to a bus request display FFa. When the FFa is reset, the R-SFFd is also reset to invert its output. Then the output of the gate AG is inverted. Thus the connection is cut between the processor PU and a common bus even under reception of a bus use permitting signal given from a bus request competition arranging device BA. Thus it is possible to prevent a malfunction due to an old bus use permitting signal despite the continuous bus requesting. |
