To Operate Correctly Starting a Ring Shift Counter Requires

By Himanshu Bajpai|Updated : July 24th, 2022

Choose the right answer to the question. To operate correctly, starting a ring shift counter requires the following options and a detailed explanation.

  1. Clearing all the flip-flops
  2. Presetting one flip-flop and clearing all the others
  3. Clearing one flip-flop and presetting all the others
  4. Presetting all the flip-flops

Answer - B.

Presetting one flip-flop and clearing all the other flip-flops is the correct way to start a ring shift counter.


A detailed solution to the question, to operate correctly starting a ring shift counter, requires provided here. 

A common use of the Shift register is as a ring counter. The shift counter and the ring counter are nearly identical. The only difference is that, in the case of the ring counter, the input of the first flip-flop is now connected with the output of the last flip-flop.


The ORI used are Preset (PR) and Clear (CLR). PR and CLR both are active low signals. When PR equals 0, the result is 1. Additionally, the output is 0 when CLR is 0.

The working of this ring counter is as follows: -


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