Question

In the given circuit, the race around condition:

• A. Does not occur
• B. Occurs when clock is zero
• C. Occurs when clock is one, A = B = 1
• D. Occurs when clock is one and A = B = 0

Hint:

Race around → Occurs in JK when J = K = 1 and clock is high long enough to toggle twice.

Answer 1

The Correct Option is C

The race around condition is a phenomenon often associated with JK flip-flops in digital circuits. It occurs when the output remains in an indeterminate condition due to the presence of feedback, causing the state to flip repeatedly within a single clock cycle. For the given circuit with a JK flip-flop, the race around condition is triggered by specific conditions:

• It typically occurs when both inputs J and K are high (1).
• The clock signal must also be active (in the high state, '1').

Given these principles, let's identify when the race around condition occurs according to the options provided:

1. Does not occur: This option is incorrect, as the race around condition does occur under specific conditions with JK flip-flops.
2. Occurs when clock is zero: This is incorrect because the race around condition requires the clock to be high.
3. Occurs when clock is one, A = B = 1: This option correctly identifies the scenario where both inputs (interpreted as J and K) are high ('1'), and the clock is also '1', satisfying the conditions for a race around.
4. Occurs when clock is one and A = B = 0: This is incorrect because for the race around condition to occur, both inputs must be '1'.

Based on the above analysis, the correct response is: Occurs when clock is one, A = B = 1.