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Sequential Circuit

Sequential Circuit. Introduction to Counter Asynchronous Counter - Ripple Asynchronous Down Counter Synchronous Counter – Parallel Synchronous Counter Up/Down Designing Synchronous Counter Counter with Parallel Load. Sequential Circuit. Contents Register Introduction Simple register

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Sequential Circuit

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  1. Sequential Circuit • Introduction to Counter • Asynchronous Counter - Ripple • Asynchronous Down Counter • Synchronous Counter – Parallel • Synchronous Counter Up/Down • Designing Synchronous Counter • Counter with Parallel Load YAMANI /ZAILY

  2. Sequential Circuit Contents • Register Introduction • Simple register • Register with parallel load • Shift Register • Shift Register Serial In/Serial Out • Shift Register Serial In/Parallel Out • Shift Register Parallel In/Serial Out • Shift Register Parallel In/ Parallel Out • Two way shift register • Random Access Memory YAMANI /ZAILY

  3. Sequential Circuit: Counter Introduction • Counter is a circuit which cycle through state sequence • Two types of counter • Synchronous counter (e.g. parallel) • Asynchronous counter (e.g. ripple) • Ripple counter let some flip-flop output to be used as clock signal source for other flip-flop • Synchronous counter use the same clock signal for all flip-flop YAMANI /ZAILY

  4. Sequential Circuit: Counter Asynchronous Counter (Ripple) • Asynchronous Counter : flip-flop doesn’t change condition simultaneously because it doesn’t use single clock signal • Also known as ripple counter because clock signal input as ripple through counter YAMANI /ZAILY

  5. Sequential Circuit: Counter Asynchronous Counter (Ripple) • Example: 2-bit ripple counter • Output from one flip-flop is connected to clock input for the next flip-flop MSB YAMANI /ZAILY

  6. Sequential Circuit: Counter Asynchronous Counter (Ripple) • Example: 3-bit ripple counter YAMANI /ZAILY

  7. Sequential Circuit: Counter Asynchronous Counter (Ripple) • Example: 4-bit ripple counter (negative edge triggered) YAMANI /ZAILY

  8. Sequential Circuit: Counter Asynchronous Down Counter • The previous example is up asynchronous counter • Down asynchronous counter count from large to zero and repeat • Example: 3-bit binary down counter YAMANI /ZAILY

  9. Sequential Circuit: Counter Asynchronous Down Counter • Example: 3-bit binary down counter (MOD 8) YAMANI /ZAILY

  10. Sequential Circuit: Counter Synchronous Counter (Parallel) • Synchronous counter: flip-flop with the same synchronous clock signal • We can build synchronous counter using process to design sequential circuit • Example: 2-bit synchronous binary counter (using T flip-flop or JK) YAMANI /ZAILY

  11. Sequential Circuit: Counter Synchronous Counter (Parallel) • Example: 2-bit synchronous binary counter (using T flip-flop or JK) cont…. YAMANI /ZAILY

  12. Sequential Circuit: Counter Synchronous Counter (Parallel) • Example: 2-bit synchronous binary counter (using T flip-flop or JK) cont…. YAMANI /ZAILY

  13. Sequential Circuit: Counter Synchronous Counter (Parallel) • Example: 2-bit synchronous binary counter (using T flip-flop or JK) cont…. YAMANI /ZAILY

  14. Sequential Circuit: Counter Synchronous Counter (Parallel) • Example: 2-bit synchronous binary counter (using T flip-flop or JK) cont…. YAMANI /ZAILY

  15. Sequential Circuit: Counter Synchronous Counter (Parallel) • Example: BCD Synchronous Counter YAMANI /ZAILY

  16. Sequential Circuit: Counter Synchronous Counter (Parallel) • Example: BCD Synchronous Counter YAMANI /ZAILY

  17. Sequential Circuit: Counter Up/Down Synchronous Counter • Up/Down Synchronous Counter: two way counter which able to count up or down • Up/Down control input line which determine the counter • Up/Down = 1 (count up) • Up/Down = 0 (count down) YAMANI /ZAILY

  18. Sequential Circuit: Counter Up/Down Synchronous Counter • Example: 3-bit Up/Down Synchronous Counter YAMANI /ZAILY

  19. Sequential Circuit: Counter Up/Down Synchronous Counter • Example: 3-bit Up/Down Synchronous Counter (cont) YAMANI /ZAILY

  20. Sequential Circuit: Counter Designing Synchronous Counter • See sequential logic lecture notes • Example: 3-bit Gray Code Counter (using JK flip-flop) YAMANI /ZAILY

  21. Sequential Circuit: Counter Designing Synchronous Counter • 3-bit Gray Code Counter: flip-flop input YAMANI /ZAILY

  22. Sequential Circuit: Counter Designing Synchronous Counter • 3-bit Gray Code Counter: logic diagram YAMANI /ZAILY

  23. Sequential Circuit: Counter Counter with Parallel Load • Counter with Parallel Load able to • Count at different condition • Count in different sequence • For increment/decrement function YAMANI /ZAILY

  24. Sequential Circuit: Counter Counter with Parallel Load • Different method to get MOD-6 counter YAMANI /ZAILY

  25. Sequential Circuit: Counter Counter with Parallel Load • Counter with 4-bit parallel load YAMANI /ZAILY

  26. Sequential Logic Contents • Register Introduction • Simple register • Register with parallel load • Shift Register • Shift Register Serial In/Serial Out • Shift Register Serial In/Parallel Out • Shift Register Parallel In/Serial Out • Shift Register Parallel In/ Parallel Out • Two way shift register • Random Access Memory YAMANI /ZAILY

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