Altera Quartus, combining Verilog and VHDL

In my previous post, I ported the Multicomp from Grant Searle to an Altera Cyclone II FPGA platform.

The Multicomp peripheral are quite minimal, and I wished to use the on board facilities. Code for these were supplied in Verilog. In my tiny pea brain, I figured that the geniuses at Altera could combine easily Verilog and VHDL code.

As soon as you add the Verilog file in the project, it’s recognized.


I ran into some errors; “design library work does not contain primary unit”. I tried different syntaxes and solutions found on the web without success, but after some tweaks, I succeeded in compiling the project.

Here is the working solution:

After including the Verilog file, we modify the main VHDL file to connect the new component.

library ieee;
use ieee.std_logic_1164.all;

entity Microcomputer is
    port(-- all the ios, etc);
end Microcomputer;

architecture struct of Microcomputer is

-- Here, we declare the Verilog component.
-- This is a One Wire controller which is connected to a Dallas chip.
component DS18B20_CTL is
    port(-- all the ios, etc);
end component;


-- We instanciate the Verilog component just as another VHDL component.
ow1 : component DS18B20_CTL
port map (-- all the ios, etc);

-- Other VHDL code


It’s as simple as that!

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