syn.directive.top - 2025.2 English - UG1702

Vitis Reference Guide (UG1702)
Document ID
UG1702
Release Date
2025-11-20
Version
2025.2 English

Description

Attaches a name to a function. The name can then be used by the set_top command to set the named function as the top. This is typically used to synthesize member functions of a class in C++.

Syntax

syn.directive.top=[OPTIONS] <location>
  • <location> is the function to be renamed.

Options

name=<string>
Specifies the name of the function to be used by the syn.top command as described in HLS General Options.

Examples

Function foo_long_name renames to DESIGN_TOP. The top-level is then specified as DESIGN_TOP. If the pragma is placed in the code, the set_top command must still be issued in the top-level specified in the GUI project settings.

syn.directive.top=name=DESIGN_TOP foo_long_name

Followed by the syn.top=DESIGN_TOP command.

See Also