Question

For the following ALU circuit, what is the value of SiSCin as input control signals for the A+B operation? (Fig. 05) Si So Ci
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Answer #1

Option B. S1S0Cin=100

As input to mux is given at 3 data line of MUX, ie., B is given to S1=1 and S2=0, so that Only B is selected from each MUX.

Now output of the MUX is the input to full adder since, initially carry is taken as 0 so that output of the full adder is same as the addition of A and B at LSB and carry generated can be forwarded to another Full adder circuit.

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