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  • HLS Stream Library

    HLS Stream Library

    Streaming data is a type of data transfer in which data samples are sent in sequential order
    starting from the first sample. Streaming requires no address management.
    Modeling designs that use streaming data can be difficult in C. As discussed in Multi-Access
    Pointer Interfaces: Streaming Data in Chapter 3, the approach of using pointers to perform
    multiple read and/or write accesses can introduce issues, because there are implications for
    the type qualifier and how the test bench is constructed.
    Vivado HLS provides a C++ template class hls::stream<> for modeling streaming data
    structures. The streams implemented with the hls::stream<> class have the following
    attributes.
    • In the C code, an hls::stream<> behaves like a FIFO of infinite depth. There is no
    requirement to define the size of an hls::stream<>.
    • They are read from and written to sequentially. That is, after data is read from an
    hls::stream<>, it cannot be read again.
    • An hls::stream<> on the top-level interface is by default implemented with an
    ap_fifo interface.
    • An hls::stream<> internal to the design is implemented as a FIFO with a depth of 1.
    The optimization directive STREAM is used to change this default size.

    Using HLS Streams

    Reference

    1.Xilinx UG902, Chapter 2, Vivado Design Suite User Guide High-Level Synthesis

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  • 原文地址:https://www.cnblogs.com/wordchao/p/10986538.html
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