CLK signal in the middle. J input on the top, K input on the bottom.
The output only flips on the rising edge of the clock signal.
If J=0, K=0, the output persists.
If J=1, K=0, the output sets to 1.
If J=0, K=1, the output sets to 0.
If J=1, K=1, the output toggles.
