9 files changed, 1112 insertions, 0 deletions
diff --git a/makefile b/makefile
new file mode 100644
index 0000000..66bc94c
--- /dev/null
+++ b/makefile
@@ -0,0 +1,3 @@
+all:
+	# make -C electronics
+	make -C techwsw
diff --git a/techwsw/build/essence_of_hwsw.pdf b/techwsw/build/essence_of_hwsw.pdf
new file mode 100644
index 0000000..652dd61
--- /dev/null
+++ b/techwsw/build/essence_of_hwsw.pdf
diff --git a/techwsw/essence_of_hwsw.tex b/techwsw/essence_of_hwsw.tex
new file mode 100644
index 0000000..d8b6bab
--- /dev/null
+++ b/techwsw/essence_of_hwsw.tex
@@ -0,0 +1,18 @@
+\documentclass[a4paper]{article}
+
+% math
+\usepackage{amsmath}
+
+% figures
+\usepackage{float}
+\usepackage{graphicx}
+
+\title{Hardware e Software}
+\author{Naoki Pross}
+
+\begin{document}
+\maketitle
+
+\include{tex/memorie}
+
+\end{document}
+\ No newline at end of file
diff --git a/techwsw/makefile b/techwsw/makefile
new file mode 100644
index 0000000..240e907
--- /dev/null
+++ b/techwsw/makefile
@@ -0,0 +1,29 @@
+# file settings
+BUILD_DIR 	:= build
+DOCUMENT	:= essence_of_hwsw.tex
+
+# tex settings
+TEX := xelatex \
+		-interaction=nonstopmode \
+		-halt-on-error \
+		-output-directory=$(BUILD_DIR)
+
+# automated stuff
+_DOCUMENT := $(BUILD_DIR)/$(DOCUMENT)
+
+_SVGS := $(shell find res/ -type f -name '*.svg')
+_PDFS := $(patsubst %.svg, %.pdf,$(_SVGS))
+
+
+# recipes
+.PHONY: build_dir
+all: $(_DOCUMENT)
+
+$(_DOCUMENT): $(DOCUMENT) $(_PDFS) build_dir
+	$(TEX) $<
+
+$(_PDFS): res/%.pdf: res/%.svg $(_SVGS)
+	inkscape -z -D --file=$< --export-pdf=$@
+
+build_dir:
+	mkdir -p $(BUILD_DIR)/tex
diff --git a/techwsw/res/memorie/ram.pdf b/techwsw/res/memorie/ram.pdf
new file mode 100644
index 0000000..0700a01
--- /dev/null
+++ b/techwsw/res/memorie/ram.pdf
diff --git a/techwsw/res/memorie/ram.svg b/techwsw/res/memorie/ram.svg
new file mode 100644
index 0000000..c009a9a
--- /dev/null
+++ b/techwsw/res/memorie/ram.svg
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+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
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+
+<svg
+   xmlns:dc="http://purl.org/dc/elements/1.1/"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
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diff --git a/techwsw/tex/memorie.tex b/techwsw/tex/memorie.tex
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+++ b/techwsw/tex/memorie.tex
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+\section{Le memorie}
+
+%\subsection{Cos'\`e una memoria}
+
+\subsection{Classificazione delle memorie}
+
+\subsection{Tipi di accesso alle memorie}
+
+\subsection{Memorie a sola lettura}
+\subsubsection{Read Only Memory ({\tt ROM})}
+
+La memoria ROM \`e un circuito combinatorio che fornisce in uscita una serie di
+dati $Y_0\dotso Y_{m-1}$ in corrispondenza ad una serie di ingressi $A_0\dotso
+A_{n-1}$. Con $n$ bit in ingresso si possono avere fino a $2^n$ celle di
+dimensione $m$ in uscita.
+In questo tipo di memoria come implica il nomele informazioni vengono conservate
+permanentemente nella configurazione del circuito, siccome esso sono costituite
+da un decodificatore ed un codificatore.
+
+%% TODO: schema intero rom
+
+\subsubsection{Programmable Read Only Memory ({\tt PROM})}
+
+\subsection{Memorie non volatili ({\tt NVRWM})}
+\subsection{Memorie a scrittura e lettura}
+\subsubsection{Random Access Memory ({\tt RAM})}
+
+In una memoeria ad acesso casuale, o memoria RAM (Random Access Memory), una
+qualsiasi locazione (della) \`e individuata da un numero (indirizzo o address) e
+il suo contenuto pu\`o essere letto o modificato in un intervallo di tempo
+costante detto \emph{tempo di accesso} $t_a$.
+
+%% doc: 01c memorie principali.pdf
+\begin{figure}[h!]
+	\includegraphics[width=\textwidth]{res/memorie/ram}
+\end{figure}
+
+Quando viene richiesta un' operazione di lettura con il segnale {\tt R},
+l'indirizzo comanda il multiplexer per passare sull'uscita il dato
+contenuto alla locazione richiesta. Nell'operazione di scrittura il segnale {\tt
+W} abilita la scrittura del dato presente in ingresso nella cella indicata
+tramite il demultiplexer. 
+
+ La RAM pu\`o essere di tipo \emph{statico} o
+\emph{dinamico}. Le {\tt SRAM} (static RAM) sono dei flip-flops, mentre le {\tt
+DRAM} (dynamic RAM) sono dei microcondensatori C-MOS nei quali 1 corrisponde al
+condensatore carico e 0 corrisponde al condensatore scarico.
+
+% Nella pratica si utano sempre RAM dinamice per l'elevata capacitit\`a di 
+% integrazione e per i costi pi\`u bassi rispetto a quelle statiche.
+
+\paragraph{La RAM dinamica} avendo un comportamento elettrico tipico dei 
+condenstatori, essa \`e soggetta alla scarica, cio\`e tende a perdere l'informazione
+contenuta, perci\`o necessitano di essere ricaricate regolarmente con della 
+circuiteria che esegue un \emph{refresh}.
+
+$$\cdot$$