Stld Quiz-6 IT C

Variable Entered Mapping (VEM) is not a mode of Flip Flop representation. Flip Flops can be represented using characteristic equations, excitation tables, and truth tables. The characteristic equation represents the relationship between the current state and the next state of a Flip Flop. The excitation table shows the inputs required to transition between states. The truth table displays the outputs of the Flip Flop for all possible input combinations. However, Variable Entered Mapping (VEM) is not a recognized mode of Flip Flop representation.

A J-K flip-flop has no invalid states because it has two inputs, J and K, which can be used to control the state of the flip-flop. In an S-R flip-flop, if both inputs are set to 1, it can enter an invalid state where both outputs are also set to 1. This can lead to unpredictable behavior. However, in a J-K flip-flop, certain input combinations are designated as "forbidden" or "don't care" states, ensuring that it always operates in a valid and predictable manner.

Both JK and T flip flops are derived from the basic S R latch. The S R latch is a fundamental building block for sequential circuits, and the JK and T flip flops are variations of the S R latch that provide additional functionality. The JK flip flop allows for toggling between states, while the T flip flop allows for toggling when a specific condition is met. Therefore, the correct answer is the basic S R latch.

When both S and R inputs of an S-R latch are set to 1, it creates a condition known as the "prohibited state". In this state, the output of the latch becomes unpredictable and can lead to a race condition. To avoid this unpredictable nature, it is necessary to prevent both S and R inputs from being set to 1 at the same time.

Latches constructed with NOR and NAND gates tend to remain in the latched condition due to cross coupling. Cross coupling refers to the feedback connection between the output and input of the latch, which helps to maintain the latched state. This feedback loop ensures that once the latch is set, it remains in that state until a reset signal is received. Cross coupling is an important configuration feature that allows the latch to retain its state even when the input voltages are low or when the latch operates asynchronously.

The characteristic equation of an SR latch determines its behavior and can be used to analyze its operation. In this case, the correct answer is "S + R'Qn." This equation represents the inputs of the SR latch, where S is the set input, R' is the reset input complemented, and Qn is the complement of the current output. This equation indicates that the next state of the latch depends on the set input and the complement of the reset input, while the output depends on the current output complemented.

In a delay flip-flop, the output follows the input after the propagation delay. This means that there is a delay between when the input signal changes and when the output signal reflects that change. The output will only change after the input has been stable for a certain amount of time, which is the propagation delay of the flip-flop.

When both inputs of an RS flip flop are set to 0, the output remains unchanged. However, if a momentary '1' is applied at the input S, it sets the Q output to 1 while the other output Q' remains 0. Therefore, the correct answer is that Q will flip from 0 to 1.

Master-slave J-K flip-flops are actually called edge-triggered devices. In these flip-flops, the input data is only read at the rising or falling edge of the clock pulse, not during the entire time the clock pulse is at a LOW level. Therefore, the statement given in the question is false.

When an active-HIGH S-R latch has a 0 on the S input and a 1 on the R input, it is in the RESET state. If the R input then goes to 0, it will remain in the RESET state. Therefore, the correct answer is RESET.