1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
|
classdef (StrictDefaults) Demux < serdes.SerdesAbstractSystemObject & TriggeredComponent
% Demux Demultiplexer
% obj = Demux returns a System Object, obj, that distributes the
% incoming sampled data to serveral outputs.
%
% Demux methods:
% step - Distributes the incoming sampled data to several outputs
% using the digital clock input to determine when to update
% the outputs.
% [SampleOut,ClockOut] = step(obj,SampleIn,ClockIn)
%
% Demux properties:
% DemuxWidth - Width of the output signal
% NumberOfClocks - Width of the input signal
% SymbolTime - Symbol time of system
% SampleInterval - Uniform time step of the system
% Copyright 2021 The MathWorks, Inc.
%#codegen
properties (Nontunable)
%Demux Width
DemuxWidth = 32;
%ADC Depth
NumberOfClocks = 4;
end
properties (Hidden, SetAccess=private)
%demux properties
SampleBuffer % Demux buffer
SampleOutInternal % Demux output
DemuxChannelIndex % Demux channel index
ClockOutInternal % Output clock
OutputClockCounter % Output clock counter
ClockHalfPeriod % Output clock half period, samples
StartUpSyncFlag % Flag to align with 0 degree phase at start up
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 = Demux(varargin)
% Support name-value pair arguments when constructing object
obj.BlockName = 'Demux';
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)
% Demux-specific properties
obj.SampleBuffer = zeros(obj.DemuxWidth, 1);
obj.SampleOutInternal = zeros(obj.DemuxWidth, 1);
obj.DemuxChannelIndex = 1;
obj.OutputClockCounter = 0;
obj.ClockOutInternal = -1;
obj.StartUpSyncFlag = false;
% Output clock half period, samples
SamplesPerSymbol = round(obj.SymbolTime/obj.SampleInterval);
obj.ClockHalfPeriod = (SamplesPerSymbol * obj.DemuxWidth) / 2;
end
function validateInputsImpl(~,waveIn)
validateattributes(waveIn,{'numeric'},{'finite'},'','waveIn');
end
function [SampleOut,ClockOut] = stepImpl(obj,SampleIn,varargin)
%[SampleOut,ClockOut] = stepImpl(obj,SampleIn,ClockIn)
if nargin==3
ClockIn = varargin{1};
else
ClockIn = 0;
end
if isSample(obj)
ClockStep(obj,ClockIn)
% On clock rising edge
if obj.PhaseRisingIndex > 0
% If demux is not sync'ed up then sync it to the first rising
% edge of 0 deg input clock phase
if (~obj.StartUpSyncFlag) && (obj.PhaseRisingIndex == 1)
obj.StartUpSyncFlag = true;
end
% If demux is sync'ed up
if obj.StartUpSyncFlag
% Before populating first demux position
if obj.DemuxChannelIndex == 1
% Release buffer to output
obj.SampleOutInternal = obj.SampleBuffer;
% Set output clock to +1; reset clock counter
obj.ClockOutInternal = +1;
obj.OutputClockCounter = 0;
end % obj.DemuxChannelIndex == 1
% Place input sample corresponding to the phase with rising
% clock edge into the next position of the output buffer
obj.SampleBuffer(obj.DemuxChannelIndex) = SampleIn(obj.PhaseRisingIndex);
% Update output buffer pointer
obj.DemuxChannelIndex = mod(obj.DemuxChannelIndex, obj.DemuxWidth) + 1;
end % obj.StartUpSyncFlag
end % obj.PhaseRisingIndex > 0
% Increment output clock counter
obj.OutputClockCounter = obj.OutputClockCounter + 1;
% After half period, set output clock to -1
if obj.OutputClockCounter > obj.ClockHalfPeriod
obj.ClockOutInternal = -1;
end
% Assign outputs
SampleOut = obj.SampleOutInternal;
ClockOut = obj.ClockOutInternal;
else
% Assign outputs
SampleOut = SampleIn;
ClockOut = 0;
end
end
function [sz_1,sz_2] = getOutputSizeImpl(obj)
% Return size for each output port
sz_1 = [obj.DemuxWidth 1];
sz_2 = [1 1];
end
function [c1,c2] = isOutputFixedSizeImpl(~)
c1 = true;
c2 = true;
end
function [dt1,dt2] = getOutputDataTypeImpl(obj)
dt1 = propagatedInputDataType(obj,1);
dt2 = propagatedInputDataType(obj,1);
end
function [c1,c2] = isOutputComplexImpl(~)
c1 = false;
c2 = false;
end
function resetImpl(~)
% Initialize / reset discrete-state properties
end
%% Simulink functions
function icon = getIconImpl(~)
% Define icon for System block
icon = "Demux";
end
function [name1,name2] = getInputNamesImpl(~)
name1 = 'Samples';
name2 = 'Clock';
end
function [name1,name2] = getOutputNamesImpl(~)
name1 = 'Samples';
name2 = sprintf('Demux\nClock');
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','NumberOfClocks',...
'SymbolTime','SampleInterval'});
end
end
end
|
