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Ring Counters

This contains two ring counters implemented using Latches and pcb!. This is designed using this wikipedia page.

  • One Hot Ring Counter / Straight Ring Counter Block diagram of One-hot ring counter Image taken from Wikimedia commons.

    This sets a pattern of 1000 and rotates it.

    • This needs 4 D latches as seen from the diagram
    • exposes e (enable), r (reset), q1-q4 (output) pins
    • to reset back to 1000, set e to false, set r to true for one tick
    • after that each 3 ticks with e set to true will shift 1 by 1 position

  • Johnson's Ring Counter / Twisted Ring Counter Block diagram of Johnson's ring counter Image taken from Wikimedia commons. This changes pattern of 0000 to 1111 and back to 0000

    • This needs 4 D latches as seen from the diagram
    • exposes e (enable), r (reset), q1-q4 (output) pins
    • to reset back to 0000, set e to false, set r to true for one tick
    • after that each 3 ticks with e set to true will shift the pattern to next state