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你好，请问DMA的选用和CPU带宽有关系吗？读写外部存储器时可以通过CPU直接读写，也可以通过DMA读写。请问什么时候选用DMA读写最佳？
选用DMA和CPU的带宽没关系，DMA传输不需要CPU管，但是DMA的传输是有优先级的
