more chapters from cvs
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sw_as_plds/ir_det_pld.dia
Normal file
751
sw_as_plds/ir_det_pld.dia
Normal file
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<dia:attribute name="text">
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<dia:string>##1 *#</dia:string>
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<dia:string>##1.1 *#</dia:string>
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<dia:string>##1.2 *#</dia:string>
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<dia:attribute name="string">
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<dia:string>##1.3 *#</dia:string>
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<dia:color val="#190707"/>
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<dia:string>#ir_self_test#</dia:string>
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<dia:color val="#000000"/>
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<dia:attribute name="valign">
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<dia:real val="6.0000000000000568"/>
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<dia:color val="#190707"/>
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<dia:attribute name="show_background">
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<dia:boolean val="false"/>
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<dia:attribute name="line_style">
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<dia:enum val="2"/>
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<dia:composite type="text">
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<dia:attribute name="string">
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<dia:string>##1.4.1 *#</dia:string>
|
||||
</dia:attribute>
|
||||
<dia:attribute name="font">
|
||||
<dia:font family="sans" style="0" name="Helvetica"/>
|
||||
</dia:attribute>
|
||||
<dia:attribute name="height">
|
||||
<dia:real val="2.1000000000000001"/>
|
||||
</dia:attribute>
|
||||
<dia:attribute name="pos">
|
||||
<dia:point val="9.695,10.0025"/>
|
||||
</dia:attribute>
|
||||
<dia:attribute name="color">
|
||||
<dia:color val="#000000"/>
|
||||
</dia:attribute>
|
||||
<dia:attribute name="alignment">
|
||||
<dia:enum val="0"/>
|
||||
</dia:attribute>
|
||||
</dia:composite>
|
||||
</dia:attribute>
|
||||
<dia:attribute name="valign">
|
||||
<dia:enum val="3"/>
|
||||
</dia:attribute>
|
||||
</dia:object>
|
||||
<dia:object type="Standard - Text" version="1" id="O13">
|
||||
<dia:attribute name="obj_pos">
|
||||
<dia:point val="9.545,12.0025"/>
|
||||
</dia:attribute>
|
||||
<dia:attribute name="obj_bb">
|
||||
<dia:rectangle val="9.545,10.5722;14.8628,13.1256"/>
|
||||
</dia:attribute>
|
||||
<dia:attribute name="text">
|
||||
<dia:composite type="text">
|
||||
<dia:attribute name="string">
|
||||
<dia:string>##1.4.2 *#</dia:string>
|
||||
</dia:attribute>
|
||||
<dia:attribute name="font">
|
||||
<dia:font family="sans" style="0" name="Helvetica"/>
|
||||
</dia:attribute>
|
||||
<dia:attribute name="height">
|
||||
<dia:real val="2.1000000000000001"/>
|
||||
</dia:attribute>
|
||||
<dia:attribute name="pos">
|
||||
<dia:point val="9.545,12.0025"/>
|
||||
</dia:attribute>
|
||||
<dia:attribute name="color">
|
||||
<dia:color val="#000000"/>
|
||||
</dia:attribute>
|
||||
<dia:attribute name="alignment">
|
||||
<dia:enum val="0"/>
|
||||
</dia:attribute>
|
||||
</dia:composite>
|
||||
</dia:attribute>
|
||||
<dia:attribute name="valign">
|
||||
<dia:enum val="3"/>
|
||||
</dia:attribute>
|
||||
</dia:object>
|
||||
<dia:object type="Standard - Text" version="1" id="O14">
|
||||
<dia:attribute name="obj_pos">
|
||||
<dia:point val="5.24,33.5485"/>
|
||||
</dia:attribute>
|
||||
<dia:attribute name="obj_bb">
|
||||
<dia:rectangle val="5.24,32.1182;13.5778,34.6716"/>
|
||||
</dia:attribute>
|
||||
<dia:attribute name="text">
|
||||
<dia:composite type="text">
|
||||
<dia:attribute name="string">
|
||||
<dia:string>#¬ir_self_test#</dia:string>
|
||||
</dia:attribute>
|
||||
<dia:attribute name="font">
|
||||
<dia:font family="sans" style="0" name="Helvetica"/>
|
||||
</dia:attribute>
|
||||
<dia:attribute name="height">
|
||||
<dia:real val="2.1000000000000001"/>
|
||||
</dia:attribute>
|
||||
<dia:attribute name="pos">
|
||||
<dia:point val="5.24,33.5485"/>
|
||||
</dia:attribute>
|
||||
<dia:attribute name="color">
|
||||
<dia:color val="#000000"/>
|
||||
</dia:attribute>
|
||||
<dia:attribute name="alignment">
|
||||
<dia:enum val="0"/>
|
||||
</dia:attribute>
|
||||
</dia:composite>
|
||||
</dia:attribute>
|
||||
<dia:attribute name="valign">
|
||||
<dia:enum val="3"/>
|
||||
</dia:attribute>
|
||||
</dia:object>
|
||||
<dia:object type="Standard - Ellipse" version="0" id="O15">
|
||||
<dia:attribute name="obj_pos">
|
||||
<dia:point val="1.39,15.711"/>
|
||||
</dia:attribute>
|
||||
<dia:attribute name="obj_bb">
|
||||
<dia:rectangle val="1.34,15.661;11.67,21.761"/>
|
||||
</dia:attribute>
|
||||
<dia:attribute name="elem_corner">
|
||||
<dia:point val="1.39,15.711"/>
|
||||
</dia:attribute>
|
||||
<dia:attribute name="elem_width">
|
||||
<dia:real val="10.230000000000032"/>
|
||||
</dia:attribute>
|
||||
<dia:attribute name="elem_height">
|
||||
<dia:real val="6.0000000000000568"/>
|
||||
</dia:attribute>
|
||||
<dia:attribute name="border_color">
|
||||
<dia:color val="#190707"/>
|
||||
</dia:attribute>
|
||||
<dia:attribute name="show_background">
|
||||
<dia:boolean val="false"/>
|
||||
</dia:attribute>
|
||||
<dia:attribute name="line_style">
|
||||
<dia:enum val="2"/>
|
||||
</dia:attribute>
|
||||
</dia:object>
|
||||
<dia:object type="Standard - Ellipse" version="0" id="O16">
|
||||
<dia:attribute name="obj_pos">
|
||||
<dia:point val="10.18,22.156"/>
|
||||
</dia:attribute>
|
||||
<dia:attribute name="obj_bb">
|
||||
<dia:rectangle val="10.13,22.106;20.46,28.206"/>
|
||||
</dia:attribute>
|
||||
<dia:attribute name="elem_corner">
|
||||
<dia:point val="10.18,22.156"/>
|
||||
</dia:attribute>
|
||||
<dia:attribute name="elem_width">
|
||||
<dia:real val="10.230000000000032"/>
|
||||
</dia:attribute>
|
||||
<dia:attribute name="elem_height">
|
||||
<dia:real val="6.0000000000000568"/>
|
||||
</dia:attribute>
|
||||
<dia:attribute name="border_color">
|
||||
<dia:color val="#190707"/>
|
||||
</dia:attribute>
|
||||
<dia:attribute name="show_background">
|
||||
<dia:boolean val="false"/>
|
||||
</dia:attribute>
|
||||
<dia:attribute name="line_style">
|
||||
<dia:enum val="2"/>
|
||||
</dia:attribute>
|
||||
</dia:object>
|
||||
<dia:object type="Standard - Text" version="1" id="O17">
|
||||
<dia:attribute name="obj_pos">
|
||||
<dia:point val="1.04,14.9485"/>
|
||||
</dia:attribute>
|
||||
<dia:attribute name="obj_bb">
|
||||
<dia:rectangle val="1.04,13.5182;8.65281,16.0716"/>
|
||||
</dia:attribute>
|
||||
<dia:attribute name="text">
|
||||
<dia:composite type="text">
|
||||
<dia:attribute name="string">
|
||||
<dia:string>#ir_detected#</dia:string>
|
||||
</dia:attribute>
|
||||
<dia:attribute name="font">
|
||||
<dia:font family="sans" style="0" name="Helvetica"/>
|
||||
</dia:attribute>
|
||||
<dia:attribute name="height">
|
||||
<dia:real val="2.1000000000000001"/>
|
||||
</dia:attribute>
|
||||
<dia:attribute name="pos">
|
||||
<dia:point val="1.04,14.9485"/>
|
||||
</dia:attribute>
|
||||
<dia:attribute name="color">
|
||||
<dia:color val="#000000"/>
|
||||
</dia:attribute>
|
||||
<dia:attribute name="alignment">
|
||||
<dia:enum val="0"/>
|
||||
</dia:attribute>
|
||||
</dia:composite>
|
||||
</dia:attribute>
|
||||
<dia:attribute name="valign">
|
||||
<dia:enum val="3"/>
|
||||
</dia:attribute>
|
||||
</dia:object>
|
||||
<dia:object type="Standard - Text" version="1" id="O18">
|
||||
<dia:attribute name="obj_pos">
|
||||
<dia:point val="13.42,21.535"/>
|
||||
</dia:attribute>
|
||||
<dia:attribute name="obj_bb">
|
||||
<dia:rectangle val="13.42,20.1047;21.9278,22.6581"/>
|
||||
</dia:attribute>
|
||||
<dia:attribute name="text">
|
||||
<dia:composite type="text">
|
||||
<dia:attribute name="string">
|
||||
<dia:string>#¬ir_detected#</dia:string>
|
||||
</dia:attribute>
|
||||
<dia:attribute name="font">
|
||||
<dia:font family="sans" style="0" name="Helvetica"/>
|
||||
</dia:attribute>
|
||||
<dia:attribute name="height">
|
||||
<dia:real val="2.1000000000000001"/>
|
||||
</dia:attribute>
|
||||
<dia:attribute name="pos">
|
||||
<dia:point val="13.42,21.535"/>
|
||||
</dia:attribute>
|
||||
<dia:attribute name="color">
|
||||
<dia:color val="#000000"/>
|
||||
</dia:attribute>
|
||||
<dia:attribute name="alignment">
|
||||
<dia:enum val="0"/>
|
||||
</dia:attribute>
|
||||
</dia:composite>
|
||||
</dia:attribute>
|
||||
<dia:attribute name="valign">
|
||||
<dia:enum val="3"/>
|
||||
</dia:attribute>
|
||||
</dia:object>
|
||||
<dia:object type="Standard - Text" version="1" id="O19">
|
||||
<dia:attribute name="obj_pos">
|
||||
<dia:point val="2.89,18.8485"/>
|
||||
</dia:attribute>
|
||||
<dia:attribute name="obj_bb">
|
||||
<dia:rectangle val="2.89,17.4182;9.48281,19.9716"/>
|
||||
</dia:attribute>
|
||||
<dia:attribute name="text">
|
||||
<dia:composite type="text">
|
||||
<dia:attribute name="string">
|
||||
<dia:string>##1.4.2.1 *#</dia:string>
|
||||
</dia:attribute>
|
||||
<dia:attribute name="font">
|
||||
<dia:font family="sans" style="0" name="Helvetica"/>
|
||||
</dia:attribute>
|
||||
<dia:attribute name="height">
|
||||
<dia:real val="2.1000000000000001"/>
|
||||
</dia:attribute>
|
||||
<dia:attribute name="pos">
|
||||
<dia:point val="2.89,18.8485"/>
|
||||
</dia:attribute>
|
||||
<dia:attribute name="color">
|
||||
<dia:color val="#000000"/>
|
||||
</dia:attribute>
|
||||
<dia:attribute name="alignment">
|
||||
<dia:enum val="0"/>
|
||||
</dia:attribute>
|
||||
</dia:composite>
|
||||
</dia:attribute>
|
||||
<dia:attribute name="valign">
|
||||
<dia:enum val="3"/>
|
||||
</dia:attribute>
|
||||
</dia:object>
|
||||
<dia:object type="Standard - Text" version="1" id="O20">
|
||||
<dia:attribute name="obj_pos">
|
||||
<dia:point val="11.64,25.5985"/>
|
||||
</dia:attribute>
|
||||
<dia:attribute name="obj_bb">
|
||||
<dia:rectangle val="11.64,24.1682;18.2328,26.7216"/>
|
||||
</dia:attribute>
|
||||
<dia:attribute name="text">
|
||||
<dia:composite type="text">
|
||||
<dia:attribute name="string">
|
||||
<dia:string>##1.4.2.2 *#</dia:string>
|
||||
</dia:attribute>
|
||||
<dia:attribute name="font">
|
||||
<dia:font family="sans" style="0" name="Helvetica"/>
|
||||
</dia:attribute>
|
||||
<dia:attribute name="height">
|
||||
<dia:real val="2.1000000000000001"/>
|
||||
</dia:attribute>
|
||||
<dia:attribute name="pos">
|
||||
<dia:point val="11.64,25.5985"/>
|
||||
</dia:attribute>
|
||||
<dia:attribute name="color">
|
||||
<dia:color val="#000000"/>
|
||||
</dia:attribute>
|
||||
<dia:attribute name="alignment">
|
||||
<dia:enum val="0"/>
|
||||
</dia:attribute>
|
||||
</dia:composite>
|
||||
</dia:attribute>
|
||||
<dia:attribute name="valign">
|
||||
<dia:enum val="3"/>
|
||||
</dia:attribute>
|
||||
</dia:object>
|
||||
<dia:object type="Standard - Text" version="1" id="O21">
|
||||
<dia:attribute name="obj_pos">
|
||||
<dia:point val="9.19,37.5985"/>
|
||||
</dia:attribute>
|
||||
<dia:attribute name="obj_bb">
|
||||
<dia:rectangle val="9.19,36.1682;14.5103,38.7216"/>
|
||||
</dia:attribute>
|
||||
<dia:attribute name="text">
|
||||
<dia:composite type="text">
|
||||
<dia:attribute name="string">
|
||||
<dia:string>##1.5.1 *#</dia:string>
|
||||
</dia:attribute>
|
||||
<dia:attribute name="font">
|
||||
<dia:font family="sans" style="0" name="Helvetica"/>
|
||||
</dia:attribute>
|
||||
<dia:attribute name="height">
|
||||
<dia:real val="2.1000000000000001"/>
|
||||
</dia:attribute>
|
||||
<dia:attribute name="pos">
|
||||
<dia:point val="9.19,37.5985"/>
|
||||
</dia:attribute>
|
||||
<dia:attribute name="color">
|
||||
<dia:color val="#000000"/>
|
||||
</dia:attribute>
|
||||
<dia:attribute name="alignment">
|
||||
<dia:enum val="0"/>
|
||||
</dia:attribute>
|
||||
</dia:composite>
|
||||
</dia:attribute>
|
||||
<dia:attribute name="valign">
|
||||
<dia:enum val="3"/>
|
||||
</dia:attribute>
|
||||
</dia:object>
|
||||
</dia:layer>
|
||||
</dia:diagram>
|
||||
169
sw_as_plds/sw_as_plds.tex
Normal file
169
sw_as_plds/sw_as_plds.tex
Normal file
@ -0,0 +1,169 @@
|
||||
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
||||
% $Id: sw_as_plds.tex,v 1.2 2008/11/04 07:40:50 robin Exp $
|
||||
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
||||
%
|
||||
%
|
||||
%%\documentclass{entcs} \usepackage{formatmacro} \usepackage{epsfig} \usepackage{pspicture} \usepackage{pstricks} \usepackage{subfigure} \usepackage{tikz}
|
||||
%\documentclass{entcs} \usepackage{formatmacro} \usepackage{epsfig} \usepackage{pstricks} \usepackage{subfigure} \usepackage{tikz}
|
||||
%
|
||||
%\newcommand{\Fam}{{\mathbb F}}
|
||||
%\newcommand{\Pow}{{\mathbb P}}
|
||||
%\newcommand{\Dis}{{\vee}}
|
||||
%\newcommand{\Con}{{\wedge}}
|
||||
%\newcommand{\FMEA}{{\bowtie}}
|
||||
%
|
||||
%\newcommand{\Nat}{{\mathbb N}}
|
||||
%\newcommand{\Real}{{\mathbb R}}
|
||||
%\newcommand{\Complex} {{\mathbb C}}
|
||||
%\newcommand{\Rational} {{\mathbb Q}}
|
||||
%
|
||||
%%\bibliographystyle{unsrt}
|
||||
%%\newtheorem{theorem}{Thoeorem}
|
||||
%
|
||||
%\def\lastname{Clark}
|
||||
%\begin{document}
|
||||
%\begin{frontmatter}
|
||||
% \title{ Software Component Failure Analysis } \author{Robin Clark\thanksref{ALL}\thanksref{r.clark@energytechnologycontrol.com}}
|
||||
% \address{ Energy Technology Control\\
|
||||
% 25 North Street, Lewes, BN7 2PE, Great Britain}
|
||||
%
|
||||
\begin{abstract}
|
||||
This chapter describes how software can be represented by first order logic, and how
|
||||
software elements be represented in a propositional logic diagram.
|
||||
When represented in this way they can be combined with other PLD's representing hardware and mechanical elements.
|
||||
Thus, Fault Mode Effects Analysis (FMEA) can be applied to electro/software/mechanical systems
|
||||
using a common mathematically based formal graphical notation.
|
||||
\end{abstract}
|
||||
|
||||
%
|
||||
%\begin{keyword}
|
||||
% fault~tree fault~mode EN298 EN61508 EN12067 EN230 UL1998 safety~critical logic euler venn propositional
|
||||
%\end{keyword}
|
||||
%\end{frontmatter}
|
||||
%
|
||||
|
||||
\section{Introduction}
|
||||
|
||||
The code in software defines logical euations and these determine the flow, or path software takes though the code.
|
||||
Because computer languages are very well defined, they can be viewed as formal languages.
|
||||
Becuase of this, they can be mapped onto propositional logic.
|
||||
|
||||
Software can be viewed in terms of program flow stages.
|
||||
Transitioning between one stage and another depends on decisions made from
|
||||
variable states. This corresponds to the standard software structures, if-then-else
|
||||
do-while etc.
|
||||
|
||||
At a program flow stage, the software may initiate actions. Typically, in an embedded
|
||||
system, a micro controller will read from external sensors, and then apply
|
||||
outputs to control the equipment under supervision.
|
||||
|
||||
Each test case in a PLD software diagram, corresponds to an action
|
||||
taken by the software. This action could be to modify an internal flag or variable,
|
||||
or it could be modify an output that can actuate an action outside the micro-controller.
|
||||
|
||||
A simple example illustrates this, a simple micro-controller program,
|
||||
that reads an IR detector and then displays status on a bank of LEDs.
|
||||
Also that it has a self test IR LED, and a mechanical shutter
|
||||
to prove the detector can determine dark IR conditions.
|
||||
|
||||
|
||||
\clearpage
|
||||
\begin{verbatim}
|
||||
// example C code
|
||||
|
||||
main () {
|
||||
|
||||
// program flow point main #1
|
||||
set_up_microcontroller_hardware();
|
||||
|
||||
while ( 1 ) {
|
||||
|
||||
// program flow point main #1.1
|
||||
delay(20 milli seconds);
|
||||
|
||||
// program flow point main #1.2
|
||||
self_test();
|
||||
|
||||
// program flow point main #1.3
|
||||
read_inputs();
|
||||
|
||||
// program flow point main #1.4
|
||||
if ( ir_self_test_passed ) {
|
||||
|
||||
// program flow point main #1.4.1
|
||||
flash_green_led();
|
||||
|
||||
// program flow point main #1.4.2
|
||||
if ( ir_detected )
|
||||
// program flow point main #1.4.2.1
|
||||
flash_yellow_led();
|
||||
else
|
||||
// program flow point main #1.4.2.2
|
||||
flash_blue_led();
|
||||
}
|
||||
// program flow point main #1.5
|
||||
else {
|
||||
// program flow point main #1.5.1
|
||||
flash_red_led(); // indicate internal ERROR
|
||||
}
|
||||
|
||||
}
|
||||
\end{verbatim}
|
||||
|
||||
\clearpage
|
||||
%
|
||||
% \begin{figure}[h+]
|
||||
% \includegraphics[scale=0.40]{sw_as_plds/ir_det_pld.eps}
|
||||
% \caption{}
|
||||
% \label{fig:ir_det_pld}
|
||||
% \end{figure} % OR
|
||||
|
||||
\begin{figure}[h]
|
||||
\centering
|
||||
\includegraphics[width=400pt,bb=0 0 675 1023,keepaspectratio=true]{sw_as_plds/ir_det_pld.png}
|
||||
% ir_det_pld.png: 675x1023 pixel, 72dpi, 23.81x36.09 cm, bb=0 0 675 1023
|
||||
\caption{IR Detector C code as PLD}
|
||||
\label{fig:ir_det_pld}
|
||||
\end{figure}
|
||||
|
||||
|
||||
Note that the function calls in the example code, will
|
||||
each create their own PLD diagram, which can be considered as being nested in
|
||||
the main diagram.
|
||||
|
||||
{\huge DIAGRAM REQUIRED OF NESTED DIAGRAMS FOR FUNCTION CALLS}
|
||||
Note it should be possible to automatically generate
|
||||
diagrams from code.
|
||||
Analyse C code for instance and make these types of diagrams.
|
||||
|
||||
\subsection{Afferent, processing and Efferent flow}
|
||||
|
||||
A concept from Yourdon dataflow analysis, is that there
|
||||
is Afferent, processing and Efferent flow.
|
||||
That is to say information comes in (afferent flow)
|
||||
is processed and the actions or data out, are the efferent flow.
|
||||
|
||||
In a real time system, this corresponds to a hierarchy where
|
||||
electrical and mechanical systems sit at either end with the
|
||||
computer providing the processing. re-phrase.
|
||||
|
||||
Need tree diagram here with MECH as lowest, electronics and then SW
|
||||
as typical program structure.
|
||||
{\huge DIAGRAM REQUIRED}
|
||||
\clearpage
|
||||
|
||||
%%\bibliography{vmgbibliography,mybib}
|
||||
%
|
||||
%
|
||||
%Typeset in \ \ {\huge \LaTeX} \ \ on \ \ \today
|
||||
%
|
||||
%\begin{verbatim}
|
||||
%CVS Revision Identity $Id: sw_as_plds.tex,v 1.2 2008/11/04 07:40:50 robin Exp $
|
||||
%\end{verbatim}
|
||||
%Compiled last \today
|
||||
%\end{document}
|
||||
%
|
||||
%\theend
|
||||
%
|
||||
%
|
||||
%
|
||||
@ -65,11 +65,11 @@
|
||||
|
||||
\typeout{ ---------------- Electronic Components as PLDs}
|
||||
\chapter {Electronic Components as PLDs}
|
||||
%\input {components_as_plds/components_as_plds}
|
||||
\input {components_as_plds/components_as_plds}
|
||||
|
||||
\typeout{ ---------------- Software as PLDs}
|
||||
\chapter {Software as PLDs}
|
||||
%\input{sw_as_plds/sw_as_plds}
|
||||
\input{sw_as_plds/sw_as_plds}
|
||||
|
||||
\typeout{ ---------------- Mechanical Sub-systems as PLDs}
|
||||
\chapter {Mechanical Sub-systems as PLDs}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user