flipflop - Why use JK Flip Flops in syncronous/asyncronous binary counters rather than D flip flops? - Electrical Engineering Stack Exchange
flipflop - Propagation delay in case of synchronous counters - Electrical Engineering Stack Exchange
digital logic - Why does my synchronous up counter count enable not function properly? - Electrical Engineering Stack Exchange
Registers and Counters. Register Register is built with gates, but has memory. The only type of flip-flop required in this class – the D flip-flop – Has. - ppt download
The implementation of a Johnson counter using D flip-flops. A Johnson... | Download Scientific Diagram
Flip-flop (electronics) - Wikipedia
Design a Synchronous Counter Using D Flip Flops - YouTube