What is the difference between dma mode and channel management mode?-Common Problem-php.cn

What is the difference between dma mode and channel management mode?

Apr 16, 2020 pm 04:49 PM

What is the difference between dma mode and channel management mode? The following article will introduce it to you. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to everyone.

What is the difference between dma mode and channel management mode?

The similarities and differences between I/O channel control mode and DMA mode:

Channel Control mode and DMA mode Similarly, it is also a memory-centered control method that realizes direct exchange of data between the device and the memory.

Different from the DMA mode, in the DMA mode, the data transmission direction, the memory address where the data is stored, and the length of the data block to be transmitted are all controlled by the CPU, while in the channel mode, these are all controlled by the CPU. channel for control. In addition, each device in DMA mode requires at least one DMA controller, and one channel controller can control multiple devices.

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