How to design a three-bit counter that counts in the sequence 0, 2, 4, 6, 0, . . . using JK flip flop - Quora
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First-In, First-Out (FIFO) Shift Registers -- Advanced Solid-State Logic: Flip-Flops, Shift Registers, Counters, and Timers
How to design a synchronous counter using D-type flip-flops for getting the following sequence, 0-3-6-9-12-15-0 - Quora
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