Difference between Straight Ring Counter and Twisted Ring Counter
Ring counter is a type of counter that is composed of a shift register with clear and preset inputs provided externally. It is of two types: 1. Straight Ring Counter : Straight ring counter is a type of ring counter in which the output of the last flip-flop is connected to the input of the first flip-flip. It circulates a single ‘0’ or ‘1’ bit around the ring. 2. Twisted Ring Counter : Twisted ring counter is a types of ring counter in which the complement of output of the last shift register is connected to the input of the first register. It circulates a stream of 1s followed by 0s around the ring.
Difference between Straight and Twisted Ring Counter:
|STRAIGHT RING COUNTER
||TWISTED RING COUNTER
|It connects the output of the last shift register to the input of first shift register.
||It connects the complement of output of the last shift register to the input of the first register.
|It is known as One hot counter.
||It is known as Walking ring counter or Johnson’s counter.
|Number of states = number of flip-flops
||Number of states = 2 x number of flip-flops
|It circulates a single bit (0 or 1) around the ring.
||It circulates stream of 1 followed by stream of 0.
|PRESET is used in first shift register.
||PRESET is not used in twisted ring counter.
|CLEAR is used for last (n-1) flip-flops.
||CLEAR is used for all flip-flips in it.
|It is used in successive approximation and stepper motor control.
||It is used in phase shift or function generator.
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