| 摘要 |
PURPOSE:To transfer a large quantity of data without interruption by dividing a memory to be used for transmitting/receiving data and enabling said memory to be used repeatedly. CONSTITUTION:The memory 2 to be used for data transfer is divided into N blocks. A DMA controller 30 contained in an I/O controller 3 reads out or writes data in each block. Every completion of reading-out or writing of the data in each block, the DMA controller 30 informs the completion to a CPU1 and turns the completed block to reusable status. After completing the reading out or writing of the whole areas of the memory 2, the DMA controller 3 returns the initial address of the memory 2. Since the fixed quantity of data can be used repeatedly, a large quantity of data can be transferred without interruption. |
