This flip-flop a similar function as the SR flip-flop. However, when both inputs J and K are true, the outputs trade their states each time the clock ticks.
This is an unstable JK flip-flop, which means that an oscillation occurs when J, K and the clock are true.
The master-slave JK flip-flop fixes the issue. This is achieved by incorporating a 'master' latch followed by a 'slave' latch.
The master-slave JK flip-flop is located here: http://everycircuit.com/circuit/5304771891691520
