1. Design the 4-bit synchronous up/down counter with timing diagram, logic diagram and truth table.
2. Explain the 4 bit ripple counter and also draw a timing diagram.
4 bit synchronous up counter using JK flip flops | Tinkercad
Virtual Labs
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
Design steps of 4-bit (MOD-16) synchronous up counter using J-K flip-flop
Ring Counter in Digital Logic - GeeksforGeeks
NJIT - COE 394 Digital Systems Laboratory - Experiment No.7: Counters
Counters | CircuitVerse
digital logic - Why does a 4-bit asynchronous counter need exactly 4 flip- flops? - Electrical Engineering Stack Exchange