Port Mapping for Verilog Instantiated in VHDL - 2023.2 English

Vivado Design Suite User Guide: Synthesis (UG901)
Document ID
UG901
Release Date
2023-11-01
Version
2023.2 English

When a Verilog module is instantiated in a VHDL entity or architecture, formal ports can have the following characteristics:

  • Allowed directions are: input, output, and inout.
  • Allowed data types are: wire and reg
  • Vivado synthesis does not support:
    • Connection to bidirectional pass options in Verilog.
    • Unnamed Verilog ports for mixed language boundaries.

Use an equivalent component declaration to connect to a case sensitive port in a Verilog module. Vivado synthesis assumes Verilog ports are in all lowercase.