Added VerilogA reference manuals

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+// Copyright(c) 2009-2014 Accellera Systems Initiative Inc.
+// 1370 Trancas Street #163, Napa, CA 94558, USA.
+//
+// The material in disciplines.vams is an essential part of the Accellera Systems
+// Initiative ("Accellera") Verilog-AMS Language Standard. Verbatim copies of
+// the material in this Annex may be used and distributed without restriction.
+// All other uses require permission from Accellera IP Committee
+// (ipr-chair@lists.accellera.org).
+// All other rights reserved.
+//
+// Version 2.4.0
+
+`ifdef DISCIPLINES_VAMS
+`else
+`define DISCIPLINES_VAMS 1
+
+//
+// Natures and Disciplines
+//
+
+discipline \logic ; 
+  domain discrete;
+enddiscipline 
+
+discipline ddiscrete; 
+  domain discrete; 
+enddiscipline 
+
+/*
+ *   Default absolute tolerances may be overridden by setting the
+ *   appropriate _ABSTOL prior to including this file
+ */
+
+// Electrical
+
+// Current in amperes
+nature Current; 
+  units        = "A";
+  access       = I;
+  idt_nature   = Charge;
+`ifdef CURRENT_ABSTOL
+  abstol       = `CURRENT_ABSTOL;
+`else
+  abstol       = 1e-12;
+`endif
+endnature 
+
+// Charge in coulombs
+nature Charge; 
+  units      = "coul";
+  access     = Q;
+  ddt_nature = Current;
+`ifdef CHARGE_ABSTOL
+  abstol     = `CHARGE_ABSTOL;
+`else
+  abstol     = 1e-14;
+`endif
+endnature
+
+// Potential in volts
+nature Voltage; 
+  units      = "V";
+  access     = V;
+  idt_nature = Flux;
+`ifdef VOLTAGE_ABSTOL
+  abstol     = `VOLTAGE_ABSTOL;
+`else
+  abstol     = 1e-6;
+`endif
+endnature 
+
+// Flux in Webers
+nature Flux; 
+  units      = "Wb";
+  access     = Phi;
+  ddt_nature = Voltage;
+`ifdef FLUX_ABSTOL
+  abstol     = `FLUX_ABSTOL;
+`else
+  abstol     = 1e-9;
+`endif
+endnature
+
+// Conservative discipline
+discipline electrical; 
+  potential    Voltage;
+  flow         Current;
+enddiscipline
+
+// Signal flow disciplines
+discipline voltage; 
+  potential    Voltage;
+enddiscipline
+
+discipline current; 
+  flow    Current;
+enddiscipline
+
+// Magnetic
+
+// Magnetomotive force in Ampere-Turns.
+nature Magneto_Motive_Force; 
+  units      = "A*turn";
+  access     = MMF;
+`ifdef MAGNETO_MOTIVE_FORCE_ABSTOL
+  abstol     = `MAGNETO_MOTIVE_FORCE_ABSTOL;
+`else
+  abstol     = 1e-12;
+`endif
+endnature
+
+// Conservative discipline
+discipline magnetic; 
+  potential    Magneto_Motive_Force;
+  flow         Flux;
+enddiscipline
+
+// Thermal
+
+// Temperature in Kelvin
+nature Temperature; 
+  units      = "K";
+  access     = Temp;
+`ifdef TEMPERATURE_ABSTOL
+  abstol     = `TEMPERATURE_ABSTOL;
+`else
+  abstol     = 1e-4;
+`endif
+endnature
+
+// Power in Watts
+nature Power; 
+  units      = "W";
+  access     = Pwr;
+`ifdef POWER_ABSTOL
+  abstol     = `POWER_ABSTOL;
+`else
+  abstol     = 1e-9;
+`endif
+endnature
+
+// Conservative discipline
+discipline thermal; 
+  potential    Temperature;
+  flow         Power;
+enddiscipline
+
+// Kinematic
+
+// Position in meters
+nature Position; 
+  units      = "m";
+  access     = Pos;
+  ddt_nature = Velocity;
+`ifdef POSITION_ABSTOL
+  abstol     = `POSITION_ABSTOL;
+`else
+  abstol     = 1e-6;
+`endif
+endnature
+
+// Velocity in meters per second
+nature Velocity; 
+  units      = "m/s";
+  access     = Vel;
+  ddt_nature = Acceleration;
+  idt_nature = Position;
+`ifdef VELOCITY_ABSTOL
+  abstol     = `VELOCITY_ABSTOL;
+`else
+  abstol     = 1e-6;
+`endif
+endnature
+
+// Acceleration in meters per second squared
+nature Acceleration; 
+  units      = "m/s^2";
+  access     = Acc;
+  ddt_nature = Impulse;
+  idt_nature = Velocity;
+`ifdef ACCELERATION_ABSTOL
+  abstol     = `ACCELERATION_ABSTOL;
+`else
+  abstol     = 1e-6;
+`endif
+endnature
+
+// Impulse in meters per second cubed
+nature Impulse; 
+  units      = "m/s^3";
+  access     = Imp;
+  idt_nature = Acceleration;
+`ifdef IMPULSE_ABSTOL
+  abstol     = `IMPULSE_ABSTOL;
+`else
+  abstol     = 1e-6;
+`endif
+endnature
+
+// Force in Newtons
+nature Force; 
+  units      = "N";
+  access     = F;
+`ifdef FORCE_ABSTOL
+  abstol     = `FORCE_ABSTOL;
+`else
+  abstol     = 1e-6;
+`endif
+endnature
+
+// Conservative disciplines
+
+discipline kinematic; 
+  potential    Position;
+  flow         Force;
+enddiscipline
+
+discipline kinematic_v; 
+  potential    Velocity;
+  flow         Force;
+enddiscipline
+
+// Rotational
+
+// Angle in radians
+nature Angle; 
+  units      = "rads";
+  access     = Theta;
+  ddt_nature = Angular_Velocity;
+`ifdef ANGLE_ABSTOL
+  abstol     = `ANGLE_ABSTOL;
+`else
+  abstol     = 1e-6;
+`endif
+endnature
+
+// Angular Velocity in radians per second
+nature Angular_Velocity; 
+  units      = "rads/s";
+  access     = Omega;
+  ddt_nature = Angular_Acceleration;
+  idt_nature = Angle;
+`ifdef ANGULAR_VELOCITY_ABSTOL
+  abstol     = `ANGULAR_VELOCITY_ABSTOL;
+`else
+  abstol     = 1e-6;
+`endif
+endnature
+
+// Angular acceleration in radians per second squared
+nature Angular_Acceleration; 
+  units      = "rads/s^2";
+  access     = Alpha;
+  idt_nature = Angular_Velocity;
+`ifdef ANGULAR_ACCELERATION_ABSTOL
+  abstol     = `ANGULAR_ACCELERATION_ABSTOL;
+`else
+  abstol     = 1e-6;
+`endif
+endnature
+
+// Torque in Newtons
+nature Angular_Force; 
+  units      = "N*m";
+  access     = Tau;
+`ifdef ANGULAR_FORCE_ABSTOL
+  abstol     = `ANGULAR_FORCE_ABSTOL;
+`else
+  abstol     = 1e-6;
+`endif
+endnature
+
+// Conservative disciplines
+discipline rotational; 
+  potential    Angle;
+  flow         Angular_Force;
+enddiscipline
+
+discipline rotational_omega; 
+  potential    Angular_Velocity;
+  flow         Angular_Force;
+enddiscipline
+
+`endif