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    • 1. 发明授权
    • DMA controller and DMA transfer method
    • DMA控制器和DMA传输方法
    • US07380027B2
    • 2008-05-27
    • US10642145
    • 2003-08-18
    • Kazuhito TakashimaHiromitsu HorieYuji Tarui
    • Kazuhito TakashimaHiromitsu HorieYuji Tarui
    • G06F13/28G06F13/00
    • G06F13/28
    • A DMA channel data quantity setting section sets a data transfer quantity of each of a plurality of DMA channels in accordance with a data quantity or a ratio in advance. A channel select control circuit determines whether each DMA channel is active. A data transfer control circuit transfers the data of the DMA channel determined to be active by the channel select control circuit in accordance with the data transfer quantity of each DMA channel set by the DMA channel data quantity setting section. By doing so, a plurality of DMA requests are accepted per bus hold request, and the number of bus management right arbitration procedures and the latency between the channels are decreased.
    • DMA通道数据量设定部根据数据量或比例预先设定多个DMA通道中的每一个的数据传送量。 通道选择控制电路确定每个DMA通道是否有效。 数据传送控制电路根据由DMA通道数据量设定部设定的各DMA通道的数据传送量,传送被通道选择控制电路确定为有效的DMA通道的数据。 通过这样做,每个总线保持请求接受多个DMA请求,并且减少总线管理权仲裁程序的数量和通道之间的等待时间。