DMA,全称Direct Memory Access,即直接存储器访问。 DMA传输将数据从一个地址空间复制到另一个地址空间,提供在外设和存储器之间或者存储器和存储器之间的高速数据传输。 我们知道CPU有转移数据、计算、控制程序转移等很多功能,系统运作的核心就是CPU, CPU无 ...
1.什么是DMA,有什么作用? DMA用于在外设与存储器之间以及存储器与存储器之间提供高速数据传输。可以在无需任何 CPU 操作的情况下通过 DMA 快速移动数据。这样节省的 CPU 资源可供其它操作使用。 我们用一个现实例子来做个类比。有一家冶炼公司,每天要不断 ...
Direct memory access (DMA) is a means of having a peripheral device control a processor’s memory bus directly. DMA permits the peripheral, such as a UART, to transfer data directly to or from memory ...
In the world of computers, the central processing unit (CPU) is–well–central. Your first computer course probably explained it like the brain of the computer. However, sometimes you can overload that ...