Solved this is a 4-bit synchronous updown counter designed | Chegg.com
digital logic - Why does a 4-bit asynchronous counter need exactly 4 flip-flops? - Electrical Engineering Stack Exchange
Synchronous counter
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Synchronous Counter and the 4-bit Synchronous Counter
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Counters | CircuitVerse
Synchronous Counter and the 4-bit Synchronous Counter
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4 Bit Up/Down Counter Explained
VLSI DESIGN: 4-bit Asynchronous up counter using JK-FF (Structural model)
74LS191 Synchronous 4-Bit Up/Down Counter IC With Mode Control
Design steps of 4-bit asynchronous up counter using J-K flip-flop
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
Solved Design in VHDL a 4-bit up-down counter as presented | Chegg.com