Discussion
What is the name of the given flip flop circuit? If the present input state of flip flop is 1, What is its next output state? (E is always unity)
Answer: A
The circuit has a single data input, which is inverted to feed the second NAND gate, an enable input E, and a cross coupled pair of NAND gates giving Q and its complement. This is the gated D latch, a D flip flop: the output follows the data input while the enable is high. It is not a T flip flop, which would feed the output back to the input to toggle.
With \(E = 1\) the next state is equal to the data input, \(Q_{next} = D = 1\). So the circuit is a D flip flop and the next output state is 1. The answer is option A. A D flip flop never inverts the data, so the options with 0 for a D flip flop are wrong.
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