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Chapter 2: Combinational Logic Design

1 Digital DesignCopyright 2006 Frank VahidDigital DesignChapter 2: Combinational Logic DesignCopyright 2006 Frank VahidIntroductionDigital circuit Let s learn to Design digital circuits We ll start with a simple form of circuit: Combinational circuit A digital circuit whose outputs depend solely on the present combinationof the circuit inputs valuesCombinationaldigital circuit1ab1F01ab?F0 Sequentialdigital DesignCopyright 2006 Frank VahidSwitches Electronic switches are the basis of binary digital circuits Electrical terminology Voltage: Difference in electric potential between two points Analogous to water pressure Current: Flow of charged particles Analogous to water flow Resistance: Tendency of wire to resist current flow Analogous to water pipe diameter V = I * R (Ohm s Law) A2 ohms9V0V9V+ A4 Digital DesignCopyright 2006 Frank VahidSwitches A switch has three parts Source input, and output Current wants to flow from source input to output Control input Voltage that controls whether that current can flow The amazing shrinking switch 1930s: Relays 1940s: Vacuum tubes 1950s: Discrete transistor 1960s.

• By defining logic gates based on Boolean algebra, we can use algebraic methods to manipulate circuits – So let’s learn some Boolean algebraic methods • Start with notation: Writing a AND b, a OR b, and NOT(a) is cumbersome – Use symbols: a * …

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