design unit Definition
A design entity that can be used together with gate and flipflop primitives and/or megafunctions in Quartus® Prime design files.
Entities include the following:
- user AHDL macrofunctions
 - Very High Speed Integrated Circuit (VHSIC) Hardware Description Language (VHDL) entity-architecture design units
 - Verilog HDL modules
 - EDIF cells inside an EDIF design
 - user schematic (or block diagram) macrofunctions
 - library of parameterized modules (LPM) functions
 - megafunctions