vhdl-highlight-keywords

vhdl-highlight-keywords is a variable defined in `vhdl-mode.el'.
Its value is

t

Documentation:
Non-nil means highlight VHDL keywords and other standardized words.
The following faces are used:
`font-lock-keyword-face' : keywords
`font-lock-type-face' : standardized types
`vhdl-font-lock-attribute-face': standardized attributes
`vhdl-font-lock-enumvalue-face': standardized enumeration values
`vhdl-font-lock-function-face' : standardized function and package names

NOTE: Activate the new setting in a VHDL buffer by re-fontifying it (menu
entry "Fontify Buffer").

You can customize this variable.