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ITEC 352

ITEC 352. Lecture 3 Low level components(2). Review. Electricity Transistors Gates Really simple circuit. Review. What are. Review #2. What does this turn into?. Review 3. What does this do?. Truth tables…. Draw the truth tables for the following functions:

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ITEC 352

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  1. ITEC 352 Lecture 3 Low level components(2)

  2. Review • Electricity • Transistors • Gates • Really simple circuit

  3. Review • What are

  4. Review #2 • What does this turn into?

  5. Review 3 • What does this do?

  6. Truth tables… • Draw the truth tables for the following functions: • F = A’B’C + A’B’C (here the ‘ stands for bar). • F = A’B + B’A

  7. Digital Circuits. • Consider the following digital circuit. • Express it as a Boolean algebra expression. • i.e., F = …? (in terms of A, B, C) • G = …?

  8. More Find the boolean expression Can you optimize it?

  9. Combinational Logic • Circuits formed using gates. • Key issue: no memory is used in building these circuits.

  10. Logic Unit • Translates a set of inputs into a set of outputs • The outputs of a CLU are strictly functions of the inputs, and the outputs are updated immediately after the inputs change. • NO MEMORY. AS SOON AS INPUT IS GIVEN (after a brief delay due to the propagational delay) THE OUTPUT SHOWS UP.

  11. Example circuitMultiplexer: Determines which input will reach output

  12. Uses of a MUX • Routers, Switches Etc… • To implement different other functions. • Multiplexers can be joined together easily. • E.g., Join two 4 X 1 mux’s to get one 8 X 1 mux. • Example: • Implement the majority function using a Multiplexer

  13. Summary • Boolean algebra • Truth tables • Mux

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