3 Design and implement a block that acts like following tabl

3. Design and implement a block that acts like following table.

1

1

A+B+1

1

0

2A + 1

0

1

A-B

0

0

Clear output ( Out = 0)

Solution

An alternative approach for the addition of two n-bit numbers is to use a separate circuit for each corresponding pair of bits. Such a circuit would accept the 2 bits to be added, together with the carry resulting from adding the less significant bits. It would yield as outputs the 1-bit sum and the 1-bit carry out to the more significant bit. Such a circuit is called a full adder. A schematic diagram is shown in Figure 1b. The 2 bits to be added are xi and yi , and the carry in i