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This annex contains the standard definition packages (disciplines.vams and constants.vams) for Verilog-AMS HDL.
D.1 The disciplines.vams file
`ifdef DISCIPLINES_VAMS
`else
`define DISCIPLINES_VAMS 1
//
// Natures and Disciplines
//
discipline logic
domain discrete;
enddiscipline
/*
* Default absolute tolerances may be overriden 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
potential 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
D.2 The constants.vams file
// Mathematical and physical constants
`ifdef CONSTANTS_VAMS
`else
`define CONSTANTS_VAMS 1
// M_ is a mathmatical constant
`define M_E 2.7182818284590452354
`define M_LOG2E 1.4426950408889634074
`define M_LOG10E 0.43429448190325182765
`define M_LN2 0.69314718055994530942
`define M_LN10 2.30258509299404568402
`define M_PI 3.14159265358979323846
`define M_TWO_PI 6.28318530717958647652
`define M_PI_2 1.57079632679489661923
`define M_PI_4 0.78539816339744830962
`define M_1_PI 0.31830988618379067154
`define M_2_PI 0.63661977236758134308
`define M_2_SQRTPI 1.12837916709551257390
`define M_SQRT2 1.41421356237309504880
`define M_SQRT1_2 0.70710678118654752440
// P_ is a physical constant
// charge of electron in coulombs
`define P_Q 1.6021918e-19
// speed of light in vacuum in meters/sec
`define P_C 2.997924562e8
// Boltzman's constant in joules/kelvin
`define P_K 1.3806226e-23
// Plank's constant in joules*sec
`define P_H 6.6260755e-34
// permittivity of vacuum in farads/meter
`define P_EPS0 8.85418792394420013968e-12
// permeability of vacuum in henrys/meter
`define P_U0 (4.0e-7 * `M_PI)
// zero celsius in kelvin
`define P_CELSIUS0 273.15
`endif
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