Flip Flops

The JK flip-flop operates as follows:

- **(A)** 0 0: The state toggles (flips between 0 and 1).

- **(B)** 0 1: The state is set to 1. - **(C)** 1 0: The state is reset to 0.

- **(D)** 1 1: The state remains unchanged.

Thus, the correct mapping is: - (A) 0 0 → **(I)** Toggle - (B) 0 1 → **(II)** Set - (C) 1 0 → **(III)** Reset - (D) 1 1 → **(IV)** No Change

Step 1: Understanding the Concept:
A transparent device is one where the output is a direct reflection of the input during the active period of the control signal. Latches are level-triggered, whereas flip-flops are edge-triggered.

Step 2: Detailed Explanation:
- D Flip-Flop: Only changes state at the clock edge. Between edges, it maintains its state regardless of input changes.
- D Latch: When the Enable (or Clock) signal is high, the output follows the input continuously. If changes while Enable is high, changes with it. This is known as transparency.

Step 3: Final Answer:
The building block described is a D latch.