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Consider the following circuit. $A = a_2a_1a_0$ and $B=b_2b_1b_0$ are three bit binary numbers input to the circuit. The output is $Z=z_3z_2z_1z_0$. R0, R1 and R2 are registers with loading clock shown. The registers are loaded with their input data with the falling edge of a clock pulse (signal CLOCK shown) and appears as shown. The bits of input number A, B and the full adders are as shown in the circuit. Assume Clock period is greater than the settling time of all circuits.

a. For 8 clock pulses on the CLOCK terminal and the inputs A, B as shown, obtain the output Z (sequence of 4-bit values of Z). Assume initial contents of R0, R1 and R2 as all zeros.

 A= 110 011 111 101 000 000 000 000 B= 101 101 011 110 000 000 000 000 Clock No 1 2 3 4 5 6 7 8

b. What does the circuit implement?

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.                    output Z

Clock -1         0000

Clock -2         0000

Clock -3         1011

Clock -4         1000

Clock -5         1010

Clock -6         1011

Clock -7         0000

Clock -8         0000

B) Circuit is a 3- bit ripple binary adder.
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how?

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