Question

Let X 5 and Y =-2 Give the inputs and outputs of a 4-bit adder/subtractor unit as depicted in Figure 5.13 (Module 40- Slide 4), to calculate X + Y Add/Sub- 512 Cn- QUESTION 2 Let X 5 and Y =-2 Give the inputs and outputs of a 4-bit adder/subtractor unit as depicted in Figure 5.13 (Module 40 - Slide 4), to calculate X-Y. x3 = L :Y1 Add/Sub- 53

I need answers for question 1 and 2

Answer 1

Q1

IN X 5 IS STORED AND IN Y -2 IS STORED

X3=0

X2=1

X1=0

X0=1

Y3=1

Y2=1

Y1=1

Y0=0

AND !ADD/SUB WILL BE 0 BECAUSE WE ARE ADDING TWO BINARY NUMBERS

HENCE ADDING THE TWO WILL GIVE US

S3=0

S2=0

S1=1

S0=1

AND Cn WILL BE 1 AS carry is generated

Q2

IN X 5 IS STORED AND IN Y -2 IS STORED

X3=0

X2=1

X1=0

X0=1

Y3=1

Y2=1

Y1=1

Y0=0

AND !ADD/SUB WILL BE 1 BECAUSE WE ARE Subtracting TWO BINARY NUMBERS

HENCE Subtracting THE TWO WILL GIVE US

S3=0

S2=1

S1=1

S0=1

AND Cn WILL BE 1

Do give a thumbs up