TECHNOLOGY 

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KembaraXtra-Case Law-Designing with Logic Gates
Core Idea
  • Complex logical statements/truth tables can be physically implemented using logic gates.
Example: (A AND B) OR C
  1. Logical Statement: IF it is sunny AND warm, OR it is my birthday, THEN I am going to the beach.
  2. Simplified Statement: (A AND B) OR C
  3. Logic Gate Diagram:
    • A and B are inputs to an AND gate.
    • The output of the AND gate and C are inputs to an OR gate.
    • The output of the OR gate is the final output.
  4. Functionality:
    • If both A and B are 1, the AND gate outputs 1.
    • If either the AND gate output or C is 1, the OR gate outputs 1.
Combinational Logic Circuits
  • Definition: A circuit where the output is ONLY a function of the present inputs.
  • Key Feature: A specific set of present inputs always produces the same output.
Sequential Logic (Brief Mention)
  • Definition: The output is a function of both present and past inputs.
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  • Not covered in detail yet.
Exercise 4-2: (A OR B) AND C
  • Goal: Translate the truth table and logical expression (A OR B) AND C into a logic gate diagram.
  • Steps:
    1. Create a truth table for (A OR B) AND C (refer to Chapter 2, Exercise 2-5 if needed).
    2. Draw a logic gate diagram:
      • A and B are inputs to an OR gate.
      • The output of the OR gate and C are inputs to an AND gate.
      • The output of the AND gate is the final output.
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