Altera Hardware Description Language (AHDL)

A high-level, modular language that is completely integrated into the Quartus^® II system. You can create AHDL Text Design Files (.tdf) with the Quartus II Text Editor or any standard text editor, then compile, simulate, and program projects within the Quartus II software. AHDL supports Boolean equation, state machine, conditional, and decode logic. AHDL also allows you to create and use parameterized functions, and includes full support for functions in the library of parameterized modules (LPM).