Fundamental State Elements
D-type edge-triggered flip-flop
The edge of the clock is used to "sample" the "D" input & send it to "Q" (positive edge triggering).
- At all other times the output Q is independent of the input D (just stores previously sampled value).
- The input must be stable for a short time before the clock edge.
- Tau clk to Q
- Look at negative-edge triggering