-- --------------------------------------------------------------------------
--
-- Title      : Draft Standard VHDL 1076.1 Multi Energy Domain Packages.
--
-- Library    : This package shall be compiled into a library symbolically
--            : named IEEE.
--
-- Developers : IEEE 1076.1 Working Group,
--              (to be changed with the actual WG PAR number).
--
-- Purpose    : This package contains declarations for modeling in the
--            : electrical energy domain.
--
-- Note       :
--
-- --------------------------------------------------------------------------
--   Modification History :
--
--   Version   Date           Description
--     1.0     6 July 2001    Original version.
-- --------------------------------------------------------------------------

library IEEE;
    use IEEE.ENERGY_SYSTEMS.all;

package ELECTRICAL_SYSTEMS is
   -- type declarations

   -- subtype declarations
   subtype VOLTAGE     is REAL tolerance "DEFAULT_VOLTAGE";
   subtype CURRENT     is REAL tolerance "DEFAULT_CURRENT";
   subtype CHARGE      is REAL tolerance "DEFAULT_CHARGE";
   subtype RESISTANCE  is REAL tolerance "DEFAULT_RESISTANCE";
   subtype CAPACITANCE is REAL tolerance "DEFAULT_CAPACITANCE" ;

   subtype MMF         is REAL tolerance "DEFAULT_MMF";
   subtype FLUX        is REAL tolerance "DEFAULT_FLUX";
   subtype INDUCTANCE  is REAL tolerance "DEFAULT_INDUCTANCE";

   -- nature declarations
   nature ELECTRICAL is
      VOLTAGE        across
      CURRENT        through
      ELECTRICAL_REF reference;
   nature ELECTRICAL_VECTOR is array (NATURAL range <>) of ELECTRICAL;

   nature MAGNETIC is
      MMF          across
      FLUX         through
      MAGNETIC_REF reference;
   nature MAGNETIC_VECTOR is array (NATURAL range <>) of MAGNETIC;

   -- subnature declarations

   -- object declarations

   -- attribute declarations
   attribute SYMBOL of VOLTAGE     : subtype is "Volt";
   attribute SYMBOL of CURRENT     : subtype is "Ampere";
   attribute SYMBOL of CHARGE      : subtype is "Coulomb";
   attribute SYMBOL of RESISTANCE  : subtype is "Ohm";
   attribute SYMBOL of CAPACITANCE : subtype is "Farad";

   attribute SYMBOL of MMF         : subtype is "Ampere-Turns";
   attribute SYMBOL of FLUX        : subtype is "Weber";
   attribute SYMBOL of INDUCTANCE  : subtype is "Henry";

   -- operation declarations (e.g., subprograms)

   -- alias declarations
   alias GROUND is ELECTRICAL_REF;
end package ELECTRICAL_SYSTEMS;