| 摘要 |
PURPOSE:To obtain such a control system that data transfer by a DAM is carried out by a burst system in a minimum time and an muPU can access to the outside, while the DAM is acting, by transmitting a signal to a driver/ receiver based on the signal from each DAM controller and interrupting a local bus relating to a DAM action from an inner bus. CONSTITUTION:In a normal mode, a DAM action is not executed, and 1st and 2nd local buses 801 and 802 are both connected to an inner bus 60. In a DMA mode the DAM action between the 1st and 2nd local buses 801 and 802, both of which are separated from the inner bus 60, executed. The muPU10, the 1st DMA C1101 and the 2nd DMA C1102 take the intiative in the inner bus 60, the 1st local bus 801 and the 2nd local bus 802, respectively. Accordingly, while 1st and 2nd devices 1001 and 1002 carry out the DMA action, the muPU10 on the inner bus 60 can freely access to a device 70, etc., for instance, on the inner bus 60. |
