#csapp This process, whereby a device performs a read or write bus transaction on its own, without any involvement of the CPU, is known as direct memory access (DMA). The transfer of data is known as a DMA transfer. 设备可以自己执行读或写的总线事务而不需要CPU干涉的过程，称为直接内存访问。这种数据传送称为DMA传送
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