This directory contains the standard source files for anaVHDL.  The
user is responsible for coding the VHDL simulation file(s) for the
a specific circuit.  The packages given here are included in the
user-defined VHDL file as "use" statements.  D2A and A2D define type
translation functions between analog and digital circuits.  See the
examples for specific descriptions on how to code the simulation file(s).