Allwinner A20 - 1.12. DMA

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1.12. DMA

1.12.1. Overview

There are two kinds of DMA in the chip. One is Normal DMA with 8 channels, the other is Dedicated

DMA with 8 channels .

For normal DMA, only one channel can be active and the sequence is in line with the priority level.

While for the dedicated DMA, at most 8-channel can be active at the same time if their source or

destination has no conflict. The dedicated DMA can only transfer data between the DRAM and the

module.

DMA can support 8-bit/16-bit/32-bit data width. The data width of Source and Destination can be

different, but the address should be aligned.

Although the increase mode of NDMA should be address aligned, but its byte counter should not be

multiple.

The DMA Source Address, Destination Address, Byte Counter Registers can be modified even if the

DMA is started.