| 摘要 |
PURPOSE:To shorten the time needed for transfer of data in DMA and through plural external interfaces. CONSTITUTION:The request signals A and B produced by the external interfaces 4 and 9 are inputted to a DMA pattern detector means 13. Then a selection signal is outputted in response to the produced DMA pattern. A request signal generating means 14 produces a request signal in response to the selection signal. Thus it is possible to continuously transfer data in, DMA through both interfaces 4 and 9 just by acquiring a single bus and therefore to shorten the data transfer time. |
