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A flip flop changes output state upon receipt of a clock edge.
A latch behaves as a real time buffer when the enable is active, and it behaves as a register when the enable is negated. It changes state whenever the enable is asserted.
The main differences between a latch and a flip-flop are that the first are level triggered and the latter are edge triggered and that a latch does not have a clock signal, whereas a flip-flop always does.
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