| 摘要 |
PURPOSE:To prevent the degradation of processing capability by providing two idle operation indicating parts consisting of non-operation commands which indicate switching of a control command, by which the data transfer operation if indicated from a central processing unit to a communication control unit which executes data transfer, to a link destination switching command, and link destination switching commands which indicate switching of said control command to a preliminarily set control command. CONSTITUTION:When the transmission request of data Di is generated, a central processing unit 1 stores a transmission command CSi, which indicates the transmission of data Di and switching to a link destination switching command CTi, and the link destination switching command CTi, which indicates the control command to be switched after the transmission of data Di, in a main storage device 2 together with data Di, and a non-operation command CN1 set to a command indicating part NX1 in a link destination switching command CT1 included in an idle operation indicating part IL1 is changed to the transmission command CSi, and a non-operation command CN2 is set to a command indicating part NXi incorporated in the link destination switching command CTi. As the result, a communication control unit 3 executes the transmission command CSi indicated by the link destination switching command CT1 to transmit data Di to a transmission line 4 successively. |
