- A VHDL design can instantiate Verilog/SystemVerilog (SV) modules and a Verilog/SV design can instantiate VHDL components. Component instantiation-based default binding is used for binding a Verilog/SV module to a VHDL component. Any other kind of mixed-use of VHDL and Verilog, such as the VHDL process calling a Verilog function, is not supported.
- A subset of VHDL types, generics, and ports are allowed on the boundary to a
Verilog/SV module. Similarly, a subset of Verilog/SV types, parameters, and ports are
allowed on the boundary to VHDL components. See Table 2. Important: Connecting the whole VHDL record object to a Verilog object is unsupported; however, VHDL record elements of a supported type can be connected to a compatible Verilog port.
- A Verilog/SV hierarchical reference cannot refer to a VHDL unit nor can a VHDL expanded or selected name refer to a Verilog/SV unit.