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Digital Electronics - Flip-Flops - Discussion

Discussion Forum : Flip-Flops - General Questions (Q.No. 19)
Flip-Flops
19.

Four positive edge-triggered D flip-flops are used to store a 4-bit binary number as shown below. Determine if the circuit is functioning properly, and if not, what might be wrong.

The circuit is functioning properly.
Q2 is incorrect; the flip-flop is probably bad.
The input to flip-flop 3 (D2) is probably wrong; check the source of D2.
A bad connection probably exists between FF-3 and FF-4, causing FF-3 not to reset.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
Discussion:
12 comments Page 2 of 2.
Lala ji said:   2 years ago
@All.
D1=-1 is not correct.
that is D1=1.
Hemant Kumar Rajyora said:   2 years ago
I think Q2 is not following D2 as Q2 is 1, when the positive edge comes that output must follow the input.

But here Q2 is 0 when the positive edge of the clock has arrived, it must be 1.
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