Toggle flip-flop is represented by T-type-flip-flop. The output of this type of flip-flop changes every time the clock goes high. T-type-flip-flops are not manufactured in this way. It is easier to create one from a D-type flip-flop. This is done by connecting the Q output to the D input. See the following diagrams.
T-type-flip-flops demonstrate one of the main advantages of clocked logic. As the flip-flop is clocked, the circuit has a lot of time to settle, before the next clocking, into its stable state, and to feed back the output to the data input. All this procedure leads the operation of the circuit completely reliable. Unless the clock is very fast, there is no risk that its operation gets upset by propagation time and other delay times.
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