Sequential Circuit Introduction to Counter

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Presentation transcript:

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

Sequential Circuit Contents Register Introduction Shift Register 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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Sequential Logic Contents Register Introduction Shift Register 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