Default Interfaces - 2022.1 English

As described in Defining Interfaces, the type of the interfaces that Vitis HLS creates depends on the data type of the C arguments or the top-level function, the target flow, the default interface mode, and any specified INTERFACE pragmas or directives.

You can specify the target flow as either Vivado® IP flow or Vitis Kernel flow using the open_solution -flow_target [vitis | vivado] option, or when opening the project solution as explained in Vitis HLS Process Overview. The following sections describe the default interface for the target flows.

Argument type definitions include the following:

• I: Input only (can only read from arg)
• O: Output only (can only write to arg)
• IO: Input & output (can read from and write to arg)
• Return: Return data output
• Block: Block-level control
• D: Default mode for each type