Topic: Digital Circuits
What is the functionality of following digital circuit? A is input data, CLK is system clock and Y is output.
- A. Falling edge detection of input A
- B. Clock division by 2
- C. Rising edge detection of input A
- D. Clock division by 4
Answer: A. Falling edge detection of input A
Explanation: The output Y = A_n' A_{n-1} when the A_n changes from 1 to 0 i.e. falling edge, A_n' = 0, A_{n-1} = 1. Thus, Y = 1.