Text Design File (.tdf) Definition

An ASCII text file (with the extension .tdf) written in the Altera Hardware Description Language (AHDL).

A TDF can contain any combination of Boolean equations, truth tables, state machines, and group operations. TDFs can also be parameterized.

You can easily incorporate Intel-provided primitives and both Intel-provided megafunctions and user-defined megafunctions and macrofunctions, including library of parameterized modules (LPM) functions, into a TDF. You can use a megafunction or macrofunction by creating a Function Prototype and inserting an instance of the function into the Text Design File. You can also use this method to incorporate Text Design File logic in another Text Design File.

Text Design Files can be incorporated into both top-level entities and lower-level entities in a project.