Global and Local Streams - 2021.2 English

Vitis High-Level Synthesis User Guide (UG1399)

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2021.2 English

Streams may be defined either locally or globally. Local streams are always implemented as internal FIFOs. Global streams can be implemented as internal FIFOs or ports:

  • Globally-defined streams that are only read from, or only written to, are inferred as external ports of the top-level RTL block.
  • Globally-defined streams that are both read from and written to (in the hierarchy below the top-level function) are implemented as internal FIFOs.

Streams defined in the global scope follow the same rules as any other global variables.