Some examples: Ring and Johnson counters

D

Q

D

Q

D

Q

D

Q

IN

OUT1

OUT2

OUT3

OUT4

CLK

• Ring counter: Sequence is 1000, 0100, 0010, 0001

  • With one of the patterns as its starting state

• Johnson counter: Sequence is 1000, 1100, 1110, 1111, 0111, 0011, 0001, 0000

D

Q

D

Q

D

Q

D

Q

IN

OUT1

OUT2

OUT3

OUT4

CLK

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