VHDL-2019 Support

While support for VHDL-2019 is being improved, this page lists the VHDL-2019 features that are supported in our latest release.

Currently Supported

All the VHDL 2019 APIs in the updated std and ieee libraries

Functions now know the return value’s type of receiver

  function convert_to_slv(constant i: in integer) return TResult of std_logic_vector is
    variable result: TResult;
  begin
    -- Can now access attributes of the receiver of this return value
    result := std_logic_vector(to_signed(i, result'length));
    return result;
  end function;

  -- Now we can do the following
  x <= convert_to_slv(i);

  -- Instead of
  x <= std_logic_vector(to_signed(i, x'length));

The ending component keyword in a component declarations is now optional
A trailing semicolon in port, generic, and parameter lists is now allowed
Parameters of impure functions can now have inout and out modes
record declarations can now be empty

Qualified expressions’ operand is now optional

  -- Value of "abc" is an empty value of the type std_logic
  constant abc : std_logic := std_logic'();

Improved syntax of power expressions (**)
when-else and unaffected expressions are now allowed in return statements
Sequential block statements
Added an autocomplete for, and improved automatic indentation of, protected type declarations

Added support for VHDL 2019 private variable declaration and aliases in protected declaration

type SharedCounter is protected
    function increment(i : integer) return integer;
    private variable v : integer := 0;
    alias aliasName is increment;
    alias aliasName2 is aliasName;
end protected SharedCounter;

Added support for VHDL 2019 generic protected type declarations

Allow conditional_or_unaffected_expression where needed

proc : process is
  variable v : bit := '1';
begin
  v := '0' when isAnswer(42) else unaffected;
end process;

Added support for VHDL 2019 Conditional Analysis
Mode views are now fully suported, more information about this new language feature can be found in this blogpost

The Sigasi Studio 4.11 release introduced VHDL 2019 into Sigasi Studio. To make use of the improved language features and APIs you need to set your Sigasi project (or a single file) to VHDL 2019 and update the std and ieee libraries:

Update the project version: Right click the project (or file) and select Properties > VHDL Version > VHDL 2019.
Update the std and ieee libraries: Right click the Common Libraries folder, and select Set Library > Reset Common libraries

We have made a screencast to demonstrate this.