How to design a synchronous counter 4 bit using JK flip flop that can count up even numbers from 0 to 14, and count down odd numbers from 15 to 0 in 1 system - Quora
What is Synchronous Counter? Definition, Circuit and Operation of Synchronous Counter - Electronics Coach
Digital Electronics Laboratory
NJIT - COE 394 Digital Systems Laboratory - Experiment No.7: Counters