Download Digitaltechnik: Lehr- und Übungsbuch für Elektrotechniker by Klaus Fricke PDF

By Klaus Fricke

Dieses Lehr- und Übungsbuch stellt praxisnah und lückenlos die Grundlagen der Digitaltechnik bis hin zur Programmierung einfacher Mikroprozessoren dar. Die Darstellung der booleschen Algebra und die verwendeten Symbole entsprechen der geltenden DIN-Norm. Die Kapitel über synchrone und asynchrone Schaltwerke wurden überarbeitet und übersichtlicher gegliedert. Übungsaufgaben am Ende eines jeden Kapitels und deren Lösung im Anhang ermöglichen auch in dieser 6. Auflage ein erfolgreiches Selbststudium.

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In der NOR-Schaltung in Bild 5-3 wird das Ausgangssignal y immer dann L wenn einer der Eingänge auf H liegt, denn dann leitet zumindest einer der n-Kanal-FET und einer der pKanal-FET sperrt. In der NAND-Schaltung dagegen geht y nur auf L wenn beide Eingänge auf H liegen. Dann nämlich leiten die n-Kanal-FET und die p-Kanal-FET sperren. 42 5 Schaltungstechnik VDD VDD x0 y x0 y x1 x1 NOR NAND x0 x1 y x0 x1 y 0 0 1 1 0 1 0 1 1 0 0 0 0 0 1 1 0 1 0 1 1 1 1 0 Bild 5-3 CMOS-Grundgatter: links NOR, rechts NAND.

In unserem Fall sind das X0, X2, X3, X5, und X6. Nun bildet man für jeden dieser Eingangsvektoren eine Konjunktion der Elemente xi, die genau für diesen Eingangsvektor den Wert 1 annimmt. 20) Man nennt m5 auch Minterm. Die Minterme enthalten immer alle Eingangsvariablen, sie werden deshalb auch Vollkonjunktionen genannt. In einem Minterm kommen die Eingangsvariablen invertiert oder nichtinvertiert vor, je nachdem, ob die entsprechende Eingangsvariable 1 oder 0 ist. 24) 22 3 Schaltalgebra Ein Minterm hat also für einen bestimmten Fall der Eingangsvariablen den Wert 1.

Es muss aber sichergestellt werden, dass alle anderen Schnittstellen dann nicht senden. Empfangen kann jede Schnittstelle unabhängig von den anderen, da dann das Potential auf dem Bus durch den einzigen Sender eingeprägt werden kann. Busleitung 1 xa0 1 EN1 1 E0 1 xs0 xa1 1 EN1 1 E1 1 xs1 xa2 1 EN1 1 E2 xs2 Bild 4-14 3 Bidirektionale Bustreiber mit Tri-State-Ausgängen, die über einen Bus kommunizieren. 1 4 verschiedene Gatter erzeugen bei positiver Logik die booleschen Funktionen: UND, ODER, Äquivalenz und Exklusiv-ODER.

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