exp 1,level 1

exp 1,level 2

2 BIT ADDER-HALF ADDER

2 BIT SUBTRACTOR-HALF SUBRACTOR

EXP 2,LEVEL 2,2 BIT ADDER

EXP 2,LEVEL 2,2 BIT SUBTRACTOR

3 BIT ADDER-LEVEL 1

3 BIT SUBTRACTOR LEVEL 1

3 BIT SUBTRACTOR-LEVEL 2

3 BIT ADDER LEVEL 2

EXP4(1)

EXP4(3)

EXP 4(2)

EXP 3,LEVEL 2

EXP 3,LEVEL 1

Exp 5,level 2....

Exp 6,level 1

Exp 6,level 2

EXP 5

Exp 5,level 2

4:1 AND 1:4

EXP7

EXP 7 LEVEL 2