Another problem for you!

Consider the following circuit. Assume that each inverter takes 1 time unit for a *low-to-high *or *high-to-low *transition. Assume that it takes 1 time unit for a pull-up path or pull-down path to pull-up or pull-down respectively. Ignore any leakage effects. Assume VDD >> VT. Also assume that there is no skew between *CLK* and*CLK_BAR* and assume that rise/fall times on all signals are zero.

- What type of sequential element is the above circuit? (Hint: Plotting the X, Y and Q with respect to the waveform of CLK and D might help you in finding the answer.)
- What is the propagation delay of this sequential element?