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classdef (StrictDefaults) IBISBridge < serdes.SerdesAbstractSystemObject & TriggeredComponent
% IBISBridge IBIS Bridge
% obj = IBISBridge returns a System Object, obj, that recombines the
% demuxed samples into their original sequence. Due to the ADC
% operation, the resulting waveform contains the same voltage
% throughout each unit interval or symbol duration.
%
% IBISBridge methods:
% step - Recombines the demuxed signals into a single signal as
% required by the IBIS-AMI standard. The clock times are also
% processed and prepared for IBIS-AMI model generation.
%
% IBISBridge methods:
% DemuxWidth - Width of the output signal
% SymbolTime - Symbol time of system
% SampleInterval - Uniform time step of the system
% Copyright 2021-2024 The MathWorks, Inc.
%#codegen
properties (Nontunable)
%Demux Width
DemuxWidth = 32;
end
properties (Hidden, SetAccess=private)
%Bridge properties
MuxCounter % Multiplexor counter
SampleCounter % Output clock counter
SamplesPerHalfSymbol % Output clock half period, samples
ClockOutInternal % Output clock
ClockTimesInternal % Output clock times
WaveOutInternal % Wave out internal
SamplesElapsed = 0; % Samples Elapsed
OutputBuffer
end
properties(Hidden)
%Property required by abstract class but unused
NumberOfClocks = 1;
end
properties (SetAccess = immutable, Nontunable, Hidden)
IsLinear = true;
IsTimeInvariant = true;
end
properties (Nontunable,Hidden)
%Input Waveform Type
% Set the input wave type as one of 'Sample' | 'Impulse' |
% 'Waveform'. The default is 'Sample'.
WaveType = 'Sample';
end
properties(Hidden, Constant)
WaveTypeSet = matlab.system.StringSet({'Sample','Impulse','Waveform'});
end
methods
% Constructor
function obj = IBISBridge(varargin)
% Support name-value pair arguments when constructing object
obj.BlockName = 'IBISBridge';
setProperties(obj,nargin,varargin{:})
end
end
methods (Hidden)
% The below methods, getAMIParameters, getAMIInputNames and
% getAMIOutputNames are for use only within the serdesDesigner App
% and will not influence the AMI parameters in Simulink whatsoever.
function amiParameters = getAMIParameters(~)
amiParameters = {};
end
function names = getAMIInputNames(~)
names = {};
end
function names = getAMIOutputNames(~)
names = {};
end
end
methods (Access = protected, Hidden)
function val = isSample(obj)
val = strcmpi(obj.WaveType,'Sample');
end
end
methods(Access = protected)
%% Common functions
function setupImpl(obj)
setupClock(obj);
% Initialize properties
obj.MuxCounter = 1;
obj.SampleCounter = 0;
SamplesPerSymbol = round(obj.SymbolTime/obj.SampleInterval);
obj.SamplesPerHalfSymbol = round(SamplesPerSymbol / 2);
obj.SamplesElapsed = 0;
obj.OutputBuffer = zeros(obj.DemuxWidth,1);
% Initialize outputs to zero
obj.WaveOutInternal = 0;
obj.ClockOutInternal = 0;
obj.ClockTimesInternal = 0;
end
function validateInputsImpl(~,waveIn)
validateattributes(waveIn,{'numeric'},{'finite'},'','waveIn');
end
function [WaveOut,ClockOut,Time] = stepImpl(obj,SampleIn,varargin)
if nargin==3
ClockIn = varargin{1};
else
ClockIn = 0;
end
if isSample(obj)
% Triggered clock step
ClockStep(obj,ClockIn)
% Calculate Clock Time
SimTime = obj.SamplesElapsed*obj.SampleInterval;
clock_times = SimTime - obj.SymbolTime/2;
if clock_times < 0
clock_times = 0;
end
% Buffer incoming frame upon its transition
if SampleIn ~= obj.OutputBuffer
obj.OutputBuffer = SampleIn;
% Force output position to beginning of frame
obj.MuxCounter = 1;
end
% Update waveform output on the rising edge of any ADC clock(s)
if any(obj.ClockRisingFlag)
obj.WaveOutInternal = obj.OutputBuffer(obj.MuxCounter);
if obj.MuxCounter < obj.DemuxWidth
obj.MuxCounter = obj.MuxCounter + 1;
end
% On rising clock edge, set output clock to 0 (edge sample location)
obj.ClockOutInternal = 0;
% Reset output clock counter
obj.SampleCounter = 0;
end
% Update output clock counter
obj.SampleCounter = obj.SampleCounter + 1;
% After half a UI, set output clock to 1 (data sample location) and update clock
% times output with current time. Use previous ClockOutInternal to prevent executing
% more than once per clock period.
if obj.SampleCounter > obj.SamplesPerHalfSymbol && obj.ClockOutInternal == 0
obj.ClockOutInternal = 1;
obj.ClockTimesInternal = clock_times;
end
else
obj.WaveOutInternal = SampleIn;
end
%Increment count
obj.SamplesElapsed = obj.SamplesElapsed + 1;
% Assign outputs
WaveOut = obj.WaveOutInternal;
ClockOut = obj.ClockOutInternal;
Time = obj.ClockTimesInternal;
end
function [sz_1,sz_2,sz_3] = getOutputSizeImpl(~)
% Return size for each output port
sz_1 = [1 1];
sz_2 = [1 1];
sz_3 = [1 1];
end
function [c1,c2,c3] = isOutputFixedSizeImpl(~)
c1 = true;
c2 = true;
c3 = true;
end
function [dt1,dt2,dt3] = getOutputDataTypeImpl(obj)
dt1 = propagatedInputDataType(obj,1);
dt2 = propagatedInputDataType(obj,2);
dt3 = "double";
end
function [c1,c2,c3] = isOutputComplexImpl(~)
c1 = false;
c2 = false;
c3 = false;
end
function resetImpl(~)
% Initialize / reset discrete-state properties
end
%% Simulink functions
function icon = getIconImpl(~)
% Define icon for System block
icon = "IBIS\nBridge";
end
function [name1,name2] = getInputNamesImpl(~)
name1 = 'Samples';
name2 = 'Clock';
end
function [name1,name2,name3] = getOutputNamesImpl(~)
name1 = 'Wave';
name2 = 'Clock';
name3 = 'Time';
end
function num = getNumInputsImpl(obj)
if isSample(obj)
num = 2;
else
num = 1;
end
end
end
methods(Static, Access=protected)
function group = getPropertyGroupsImpl(~)
% Define property section(s) for System block dialog
group = matlab.system.display.SectionGroup(...
'Title','Main',...
'PropertyList',{'DemuxWidth',...
'SymbolTime','SampleInterval'});
end
end
end
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