Debugging C/RTL Co-Simulation - 2022.2 English

Vitis High-Level Synthesis User Guide (UG1399)

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2022.2 English

When C/RTL co-simulation completes, Vitis HLS typically indicates that the simulations passed and the functionality of the RTL design matches the initial C code. When the C/RTL co-simulation fails, Vitis HLS issues the following message:

@E [SIM-4] *** C/RTL co-simulation finished: FAIL ***

Following are the primary reasons for a C/RTL co-simulation failure:

  • Incorrect environment setup
  • Unsupported or incorrectly applied optimization directives
  • Issues with the C test bench or the C source code

To debug a C/RTL co-simulation failure, run the checks described in the following sections. If you are unable to resolve the C/RTL co-simulation failure, see Xilinx Support for support resources, such as answers, documentation, downloads, and forums.