Top Function Declaration - 2022.2 English

Vitis Tutorials: AI Engine Development

Document ID
XD100
Release Date
2022-12-01
Version
2022.2 English

The dma_hls kernel takes the following arguments, as shown in the following example:

int dma_hls(
      hls::stream<qdma_axis<128, 0, 0, 0>> &strmOut_to_rowiseFFT,
      hls::stream<qdma_axis<128, 0, 0, 0>> &strmInp_from_rowiseFFT,
      hls::stream<qdma_axis<128, 0, 0, 0>> &strmOut_to_colwiseFFT,
      hls::stream<qdma_axis<128, 0, 0, 0>> &strmInp_from_colwiseFFT,
      int matSz, int rows, int cols, int iterCnt
     );
  • ap_int<N> is an arbitrary precision integer data type defined in ap_int.h where N is a bit size from 1-1024. In this design, the bit size is set to 128.

  • hls::stream<qdma_axis<D,0,0,0>> is a data type defined in ap_axi_sdata.h. It is a special data class used for data transfer when using a streaming platform. The parameter <D> is the data width of the streaming interface, which is set to 128. The remaining three parameters should be set to 0.