| 术语 | direct-memory access (DMA) |
| 释义 | direct-memory access (DMA) 直接存储器存取;［直接记忆接达］ 1. The preferred form of data transfer for use with high-speed storage devices such as magnetic disk or tape units. The DMA mechanism transfers data directly between memory and peripheral devices. The CPU is involved only in setting up the transfer; the transfers take place with no processor intervention on a cycle stealing basis. The DMA transfer rate is limited only by the bandwidth of the memory and the data transfer characteristics of the device. The device generates a DMA request when it is ready to transfer data. 一种用于像磁盘或磁带机那样的高速存储设备的数据传送的优选形式。DMA机构在存储器 和外围设备之间直接传送数据。只有在准备传送时,CPU才干预,数据传送在周期挪用的基础 上,在不用处理器干预的情况下进行。DMA传送率只受存储器的带宽和设备的数据传送特性的 限制。当设备准备传送数据时发出DMA请求。 2. High-speed data transfer operation in which an input/output (I/O) channel transfers information directly to or from the memory. 高速数据传送操作,在这操作中,输入输出信道和存储器之间直接传送信息。 同data break。 |
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