vhdl-use-direct-instantiation

vhdl-use-direct-instantiation is a variable defined in `vhdl-mode.el'.
Its value is

standard

Documentation:
Non-nil means use VHDL'93 direct component instantiation.
Never : never
Standard: only in VHDL standards that allow it (VHDL'93 and higher)
Always : always

You can customize this variable.