CDA3101-L03-logic2-MSS - 1 data output n control inputs...

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CDA 3101 Fall 2011 Introduction to Computer Organization Digital Logic “102” 26 August 2011 Mark Schmalz http://www.cise.ufl.edu/~mssz/CompOrg/Top-Level.html
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Overview Review of gates and truth tables Boolean algebra Complex logic circuits Combinational logic systems Clocking Memory elements
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Transistors NOT gate (Inverter) Symbol Functional Behavior
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NOT Gate NAND Gate Gate Symbol Truth Table
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AND, OR, NOR Gates NOR
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Boolean Algebra Basic operators: OR (sum), AND (product), NOT Boolean laws:
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Circuit Equivalence
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The Majority Function M = f (A, B, C) M = ABC + ABC + ABC + ABC
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Combinatorial Logic Many inputs and many outputs Outputs are uniquely determined by inputs Absence of memory elements Basic combinatorial circuits Multiplexers Demultiplexers Decoders Comparators
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Multiplexer 2 n data inputs
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Unformatted text preview: 1 data output n control inputs Decoder n data inputs 2 n data outputs 3-to-8 decoder Comparator Two-Level Logic x PLA 12 inputs 6 outputs Clocks Clock period Edge-Triggered Clocking State Element 1 State Element 2 Combinational logic State Element Combinational logic NOR SR Latch State 0 State 1 Inputs S - set R - reset Outputs: Q and Q Clocked SR Latch Clocked D Latch D C Q D flip-flop D C Q C D Q D latch C D Q D latch C D Q Q Q Setup time hold time Conclusions • Digital logic – lowest level of CDA3101 worldview • Digital logic circuits – Made from building blocks (AND,OR,NOT,…) – Simple or Complex, Combinatorial – Synchronous (clocked) or Asynchronous • Know rules for Boolean Algebra Enjoy your weekend !!...
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