Scatter Gather DMA Mode

Zynq UltraScale+ Device Technical Reference Manual (UG1085)

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2.4 English

In scatter gather mode, DMA transfer parameters are specified in memory (descriptors) and parameters in APB registers are ignored. Software programs SRC and DST descriptors programs registers to point to the start of these descriptors in memory and enables a channel. Upon receiving a channel enable, the DMA channel fetches SRC and DST descriptors from memory and uses these parameters to perform the actual data transfer. The descriptors must be configured before enabling a channel.