Can I directly instantiate a Verilog HDL entity in a VHDL design file by referencing the library?

Due to a limitation in the Quartus® II synthesis, you cannot directly instantiate a Verilog HDL module in a VHDL design file by referencing it with the library. For example, you cannot instantiate a Verilog HDL module using the following syntax:

<Verilog HDL instance>: entity <library name>.<Verilog HDL module>

To work around this limitation, create a component declaration for the Verilog HDL module before instantiating it. The component can be declared in a package or in the architecture section of the design.

This limitation is scheduled to be fixed in a future release of the Quartus II software.