Modelica.Electrical.Digital.Delay

Information

The Delay package collects the delay blocks which are used in many components. Both transport and inertial delay are offered for scalar connectors. The most advanced component is the sensitive interial delay the delay time of which is chosen in dependency of the signal values. This component is also available for vector valued input.

Extends from Modelica.Icons.Package (Icon for standard packages).

Package Content

Name	Description
DelayParams	Definition of delay parameters
TransportDelay	Transport delay with initial parameter
InertialDelay	Inertial delay with initial parameter
InertialDelaySensitive	Provide the input as output if it holds its value for a specific amount of time
InertialDelaySensitiveVector	Delay of a vector of digital signals

Modelica.Electrical.Digital.Delay.DelayParams

Information

DelayParams is a partial model for providing delay times and inertial values. It is used in components of the package Gates which need the same parameters. The partial model does not have any behavior or equations.

Parameters

Type	Name	Default	Description
Time	tLH		Rise inertial delay [s]
Time	tHL		Fall inertial delay [s]
Logic	y0	L.'U'	Initial value of output

Modelica definition

partial block DelayParams "Definition of delay parameters"
  import L = Modelica.Electrical.Digital.Interfaces.Logic;
  parameter Modelica.SIunits.Time tLH(start=0) "Rise inertial delay";
  parameter Modelica.SIunits.Time tHL(start=0) "Fall inertial delay";
  parameter L y0=L.'U' "Initial value of output";
end DelayParams;

Modelica.Electrical.Digital.Delay.TransportDelay

Information

Provide the input as output exactly delayed by Tdel. If time less than Tdel the initial value initout holds.

Extends from D.Interfaces.SISO (Single input, single output).

Parameters

Type	Name	Default	Description
Time	delayTime		delay time [s]
Logic	y0	L.'U'	initial value of output

Connectors

Type	Name	Description
output DigitalOutput	y	Connector of Digital output signal

Modelica definition

model TransportDelay "Transport delay with initial parameter"
  import D = Modelica.Electrical.Digital;
  import L = Modelica.Electrical.Digital.Interfaces.Logic;
  extends D.Interfaces.SISO(x(start=L.'U',fixed=true));
  parameter Modelica.SIunits.Time delayTime(start=0) "delay time";
  parameter D.Interfaces.Logic y0=L.'U' "initial value of output";
protected 
  D.Interfaces.Logic x_delayed;

equation 
  x_delayed = integer(delay(x, delayTime));
  y = if delayTime > 0 then 
          (if time >= delayTime then x_delayed else y0) else 
            pre(x);
end TransportDelay;

Modelica.Electrical.Digital.Delay.InertialDelay

Information

Provides the input as output delayed by Tdel if the input holds its value for a longer time than Tdel. If time is less than Tdel the initial value initout holds.

Extends from D.Interfaces.SISO (Single input, single output).

Parameters

Type	Name	Default	Description
Time	delayTime		Minimum time to hold value [s]
Logic	y0	L.'U'	Initial value of output y

Connectors

Type	Name	Description
input DigitalInput	x	Connector of Digital input signal
output DigitalOutput	y	Connector of Digital output signal

Modelica definition

block InertialDelay "Inertial delay with initial parameter"
  import D = Modelica.Electrical.Digital;
  import L = Modelica.Electrical.Digital.Interfaces.Logic;
  extends D.Interfaces.SISO;
  parameter Modelica.SIunits.Time delayTime(start=0) 
    "Minimum time to hold value";
  parameter D.Interfaces.Logic y0=L.'U' "Initial value of output y";
protected 
  D.Interfaces.Logic y_auxiliary(start=y0, fixed=true);
  D.Interfaces.Logic x_old(start=y0, fixed=true);
  discrete Modelica.SIunits.Time t_next(start=delayTime, fixed=true);

algorithm 
  when delayTime > 0 and change(x) then
    x_old := x;
    t_next := time + delayTime;
  elsewhen time >= t_next then
    y_auxiliary := x;
  end when;
  y := if delayTime > 0 then y_auxiliary else x;
end InertialDelay;

Modelica.Electrical.Digital.Delay.InertialDelaySensitive

Information

Provides the input as output delayed by Tdel if the input holds its value for a longer time than Tdel. If the time is less than Tdel the initial value initout holds.
The delay Tdel depends on the values of the signal change. To calculate Tdel, the delaymap specified in Digital.Tables is used. If the corresponding value is 1, then tLH is used, if it is -1, then tHL is used, if it is zero, the input is not delayed.

Extends from D.Interfaces.SISO (Single input, single output).

Parameters

Type	Name	Default	Description
Time	tLH		rise inertial delay [s]
Time	tHL		fall inertial delay [s]
Logic	y0	L.'U'	initial value of output

Connectors

Type	Name	Description
output DigitalOutput	y	Connector of Digital output signal

Modelica definition

model InertialDelaySensitive 
  "Provide the input as output if it holds its value for a specific amount of time"

  import D = Modelica.Electrical.Digital;
  import L = Modelica.Electrical.Digital.Interfaces.Logic;
  extends D.Interfaces.SISO(x(start=L.'U',fixed=true));
  parameter Modelica.SIunits.Time tLH(start=0) "rise inertial delay";
  parameter Modelica.SIunits.Time tHL(start=0) "fall inertial delay";
  parameter D.Interfaces.Logic y0=L.'U' "initial value of output";
protected 
  Integer delayTable[:,:]=Modelica.Electrical.Digital.Tables.DelayTable 
    "specification of delay according to signal change";
  Modelica.SIunits.Time delayTime;
  D.Interfaces.Logic y_auxiliary(start=y0, fixed=true);
  D.Interfaces.Logic y_old(start=y0, fixed=true);
  Integer lh;
  discrete Modelica.SIunits.Time t_next;

algorithm 
  when {initial(),(tLH > 0 or tHL > 0) and change(x) and not initial()} then
    y_old := if initial() or pre(y) == 0 then y0 else pre(y);  //nicht pre(x), Bezugspunkt ist das aktuelle Ausgangssiganl (Donath, 08.09.09)
    lh := delayTable[y_old, x];
    delayTime := if (lh > 0) then tLH else (if (lh < 0) then tHL else 0);
    t_next := time + delayTime;
    if (lh == 0 or abs(delayTime) < Modelica.Constants.small) then
      y_auxiliary := x;
    end if;
 elsewhen time >= t_next then
    y_auxiliary := x;
 end when;
 y := if ((tLH > 0 or tHL > 0)) then y_auxiliary else x;
end InertialDelaySensitive;

Modelica.Electrical.Digital.Delay.InertialDelaySensitiveVector

Information

The delay element Inertial Delay Sensitive is applied to a vector of n signals. The parameters tLH and tHL are valid for each of the n signals.

Parameters

Type	Name	Default	Description
Time	tHL	0	High->Low delay [s]
Time	tLH	0	Low->High delay [s]
Integer	n	1	Data width

Connectors

Type	Name	Description
input DigitalInput	x[n]
output DigitalOutput	y[n]

Modelica definition

model InertialDelaySensitiveVector 
  "Delay of a vector of digital signals"
  import D = Modelica.Electrical.Digital;
  import L = Modelica.Electrical.Digital.Interfaces.Logic;
  import S = Modelica.Electrical.Digital.Interfaces.Strength;
  import T = Modelica.Electrical.Digital.Tables;
  parameter Modelica.SIunits.Time tHL=0 "High->Low delay";
  parameter Modelica.SIunits.Time tLH=0 "Low->High delay";
  parameter Integer n(min=1) = 1 "Data width";
  D.Interfaces.DigitalInput x[n];
  D.Interfaces.DigitalOutput y[n];
  Digital.Delay.InertialDelaySensitive inertialDelaySensitive[n](each tLH=
        tLH, each tHL=tHL);
equation 
  for i in 1:n loop
    connect(x[i], inertialDelaySensitive[i].x);
    connect(inertialDelaySensitive[i].y, y[i]);
  end for;
end InertialDelaySensitiveVector;