Versal ACAP Technical Reference Manual (AM011)

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1.4 English

The LPD DMA controller has eight DMA channels. Each channel is divided into two functional sides (in simple DMA mode) or two queues (in scatter-gather DMA mode), source (read) and destination (write).

The schematic in the following figure illustrates the source and destination side scatter-gather mode buffer descriptor arrays. The buffer descriptors (DSCR) point to their respective buffers. The DMA facilitates transfer of data from source (SRC) buffers to destination (DST) buffers. A source side descriptor can go to multiple destination side descriptors.

Figure 1. SRC and DST Descriptors Pointing to Data Buffers