ECE380 Digital Logic


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1 ECE38 igital Logic FlipFlops, Registers and Counters: FlipFlops r.. J. Jackson Lecture 25 Flipflops The gated latch circuits presented are level sensitive and can change states more than once during the active period of the signal Circuits (storage elements) that can change their state no more than once during a period are also useful Two types of circuits with such behavior Masterslave flipflip Edgetriggered flipflop r.. J. Jackson Lecture 252
2 Masterslave flipflop Consists of 2 gated latches The first, master, changes its state while = The second, slave, changes its state while = Master Slave m s Clk Clk 38 transistors r.. J. Jackson Lecture 253 Masterslave flipflop When =, the master tracks the values of the input signal and the slave does not change Thus m follows any changes in and s remains constant When the signal changes to, the master stage stops following the changes in the input signal At the same time, the slave stage responds to the value of m and changes states accordingly Since m does not change when =, the slave stage undergoes at most one change of state during a cycle From an output point of view, the circuit changes s (its output) at the negative edge of the signal r.. J. Jackson Lecture
3 Masterslave flipflop m = s r.. J. Jackson Lecture 255 Edgetriggered flipflop A circuit, similar in functionality to the masterslave flipflop, can be constructed with 6 NAN gates P3 P 2 5 P2 6 3 Positiveedgetriggered type flipflop 4 P4 24 transistors r.. J. Jackson Lecture
4 Edgetriggered flipflop The previous circuit responds on the positive edge of the signal A negativeedge triggered flipflop can be constructed by replacing the NAN with NOR gates Positiveedgetriggered type flipflop Negativeedgetriggered type flipflop r.. J. Jackson Lecture 257 Comparing storage elements a clk b a b c c r.. J. Jackson Lecture
5 Clear and preset inputs It may be desirable to specifically set (=) or clear (=) a flipflop Practical flipflops often have preset and clear inputs Generally, these inputs are asynchronous (they do not depend on the signal) Preset As long as Preset =, = Clear As long as Clear =, = r.. J. Jackson Lecture 259 T flipflop Another flipflop type, the T flipflop, can be derived from the basic flipflop presented Feedback connections make the input signal equal to the value of or under control of a signal labeled T T r.. J. Jackson Lecture 255
6 T flipflop The name T derives from the behavior of the circuit, which toggles its state when T= This feature makes the T flipflop a useful element when constructing counter circuits T (t+) (t) (t) T T Positive edge triggered r.. J. Jackson Lecture 25 JK flipflop The JK flipflop can also be derived from the basic flipflop such that =J +K The JK flipflop combines aspects of the SR and the T flipflop It behaves as the SR flipflop (where J=S and K=R) for all values except J=K= For J=K=, it toggles like the T flipflop r.. J. Jackson Lecture
7 JK flipflop J K J K (t+) (t) (t) J K Positive edge triggered r.. J. Jackson Lecture 253 JK flipflop timing diagram Complete the following timing diagram Clk K J Time r.. J. Jackson Lecture
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