2-D Transfers - 7.1 English

AXI DMA v7.1 LogiCORE IP Product Guide (PG021)

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7.1 English

In Multichannel Mode, AXI DMA supports 2-D memory access patterns to be efficiently transferred with an AXI4-Stream channel.

Access patterns are controlled with descriptor fields HSIZE, VSIZE, and STRIDE, which enable the transfer of sub-blocks within the (implicit) 2-D array. HSIZE is specified between starting addresses for successive 'row' sub-blocks. For 2-D transfers, the HSIZE, VISZE and STRIDE should be byte aligned. Having unaligned values of HSIZE, VSIZE or STRIDE causes unexpected behavior.

Each read (MM2S) or write (S2MM) transfer consists of VSIZE transfers, each of size HSIZE. The starting address of each successive transfer is STRIDE address from the starting address of the previous transfer (initially, the BaseAddr of the packet transfer).

The following figure shows the example of the two-dimensional data format.

Figure 1. 2-D Data Format