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SYEN 3330 Digital Systems

SYEN 3330 Digital Systems. Chapter 6 – Part 1. Outputs. Inputs. Combina-tional Logic. Storage Elements. Next State. State. Sequential Circuits. Outputs. Inputs. Combina-tional Logic. Storage Elements. Next State. State. Sequential Circuits. Overview of Chapter 6.

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SYEN 3330 Digital Systems

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  1. SYEN 3330 Digital Systems Chapter 6 – Part 1 SYEN 3330 Digital Systems

  2. Outputs Inputs Combina-tional Logic Storage Elements Next State State Sequential Circuits SYEN 3330 Digital Systems

  3. Outputs Inputs Combina-tional Logic Storage Elements Next State State Sequential Circuits SYEN 3330 Digital Systems

  4. Overview of Chapter 6 • Types of Sequential Circuits • Storage Elements • Latches • Flip-Flops • Sequential Circuit Analysis • State Tables • State Diagrams • Sequential Circuit Design • Specification • Assignment of State Codes • Implementation • HDL Representation SYEN 3330 Digital Systems

  5. Types of Sequential Circuits • Depends on time at which inputs are observed by storage elements and state of storage elements change • Synchronous • Behavior defined from knowledge of its signals at discrete instances of time • Storage elements affected by inputs and can change state only in relation to a timing signal (clock pulses from a clock) • Asynchronous • Behavior defined from knowledge of inputs at any instant of time and the order in continuous time in which inputs change • If clock just regarded as another input, all circuits are asynchronous! • Nevertheless, the synchronous abstraction makes complex designs tractable! SYEN 3330 Digital Systems

  6. Discrete Event Simulation SYEN 3330 Digital Systems

  7. Simulated NAND Gate SYEN 3330 Digital Systems

  8. Storing State SYEN 3330 Digital Systems

  9. Storing State (Continued) • The circuit becomes: SYEN 3330 Digital Systems

  10. Storing State (Continued) SYEN 3330 Digital Systems

  11. Storing State (Continued) SYEN 3330 Digital Systems

  12. Basic NAND S -R Latch SYEN 3330 Digital Systems

  13. Simulating S -R Latch SYEN 3330 Digital Systems

  14. Basic S - R Latch SYEN 3330 Digital Systems

  15. Clocked S - R Latch SYEN 3330 Digital Systems

  16. Clocked S - R Latch (Continued) SYEN 3330 Digital Systems

  17. Characteristic Equation for S - R Latch SYEN 3330 Digital Systems

  18. D Latch SYEN 3330 Digital Systems

  19. J-K Latch SYEN 3330 Digital Systems

  20. T Latch SYEN 3330 Digital Systems

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