Module Instantiation Using Mixed Languages

To instantiate a Verilog module inside a VHDL entity, you must first declare a component that models the interface of the Verilog HDL module. The component should have the same port names and port ranges as the Verilog HDL module declaration.

If the port names do not match, the Intel^® Quartus^® Prime software issues an error.
If the port ranges do not match, the Intel^® Quartus^® Prime software issues a warning and connects individual bits in the port by name.

In the this example, the VHDL component for the Verilog HDL module sub declares port A with the range 1 to 4, which does not match the range of port a in sub.

From Verilog HDL:

module sub(input
a[5:2],...)"...

From VHDL, the prototype of sub looks like:

COMPONENT sub
PORT (
A : IN STD_LOGIC_VECTOR (1 TO 4);
...
);
END COMPONENT;

The Intel^® Quartus^® Prime software will connect the component and module ports as follows:

Verilog HDL Pin	VHDL Port
No match	A[1]
a[2]	A[2]
a[3]	A[3]
a[4]	A[4]
a[5]	No match