-- --------------------------------------------------------------------------
--
-- Title      : Draft Standard VHDL 1076.1.1 Packages for Multiple Energy 
--            : Domain Support.
--
-- Library    : This package shall be compiled into a library symbolically
--            : named IEEE.
--
-- Developers : IEEE 1076.1.1 Working Group
--
-- Purpose    : This package contains material and environmental constants 
--            : that may have different values depending on how they are 
--            : measured or may vary for simulation. Therefore, we will
--            : only be submitting these deferred constants as part of the 
--            : standard in order to reserve the names. This will allow 
--            : users and vendors to supply their own values according to
--            : their needs.
--
-- Note       :
--
-- --------------------------------------------------------------------------
--   Modification History :
--
--   Version   Date           Description
--     1.0     31 Aug 2002    Original version from DAC 2002.
--     1.1     30 Sep 2002    FDL 2002 revisions.
-- --------------------------------------------------------------------------

library IEEE;
    use IEEE.MATH_REAL.all;

package MATERIAL_CONSTANTS is

   -- Relative permittivity of silicon
   -- source?
   -- uncertainty: ?
   -- constant EPS_SI : REAL := 11.7;
   constant PHYS_EPS_SI : REAL;

   -- Relative permittivity of silicon dioxide
   -- source?
   -- uncertainty: ?
   -- constant EPS_SIO2 : REAL := 3.9;
   constant PHYS_EPS_SIO2 : REAL;

   -- Young's Modulus for silicon <PASCALS>
   -- source?
   -- uncertainty: ?
   -- constant E_SI : REAL := 190.0e+9;
   constant PHYS_E_SI : REAL;

   -- Young's Modulus for silicon dioxide <PASCALS>
   -- source?
   -- uncertainty: ?
   -- constant E_SIO2 : REAL := 73.0e+9;
   constant PHYS_E_SIO2 : REAL;

   -- Poisson's Ratio for silicon <100orientation>
   -- source?
   -- uncertainty: ?
   -- constant NU_SI : REAL := 0.28;
   constant PHYS_NU_SI : REAL;

   -- Density of Polysilicon
   -- source?
   -- uncertainty: ?
   -- constant RHO_POLY : REAL := 2330.0;
   constant PHYS_RHO_POLY : REAL;

   -- Environmental constants
   constant AMBIENT_TEMPERATURE : REAL;
   constant AMBIENT_PRESSURE    : REAL;
   constant AMBIENT_LUMINANCE   : REAL;

end package MATERIAL_CONSTANTS;