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The Johnson Ring Counter or “Twisted Ring Counters”, is another shift register with feedback exactly the same as the standard Ring Counter, except that this time the inverted output Q of the last flip-flop is now connected back to the input D of the first flip-flop.
The main advantage of this type of ring counter is that it only needs half the number of flip-flops compared to the standard ring counter then its modulo number is halved. So a “n-stage” Johnson counter will circulate a single data bit giving sequence of 2n different states and can therefore be considered as a “mod-2n counter”.
chatGPT- Design a Johnson ring counter in VHDL
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