1. The problem statement, all variables and given/known data I'm asked to turn JFKK to DFF. I am always puzzled by such problems. I decided to take it step by step and first draw the truth charts and black-boxes for each: http://img204.imageshack.us/img204/6189/jkffkk.jpg [Broken] I can see that in order to turn JKFF truth table to DFF, in line to I need it to be 00. But even if I attach NOT gate to K, then the first line no longer matches DFF truth table. I started looking at logic gates, but it appears no matter which change I make in one line I can't get all my lines to correspond. Can I get any hints? Another question I have is, am I only allowed to attach logic gates to J or K in such exercises, or can I do crazier things like attaching J to K?