Designing of Low Power Dual Edge-Triggered Static D Flip-Flop with DETFF Logic | Semantic Scholar
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This happens to be a negative edge triggered JK flip flop. I used boolean algebra and found D = E' and E = D'. Given the propagation delay I thought this was
negative-edge-triggered - Wiktionary, the free dictionary
Negative-Edge-Triggered T Flip-Flop
File:Negative-edge triggered master slave D flip-flop.svg - Wikipedia