A ring counter is a Shift Register (a cascade connection of flip-flops) with the output of the last flip flop connected to the input of the first. It is initialised such that only one of the flip flop output is 1 while the remander is 0. The 1 bit is circulated so the state repeats every n clock cycles if n flip-flops are used. The "MOD" or "MODULUS" of a counter is the number of unique states. The MOD of the n flip flop ring counter is n.
It can be implemented using D-type flip-flops (or JK-type flip-flops).
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