reate a table relating base 10 integers to their excess 7 binary sequences.
B. Using your 4-bit full adder/subtractor circuit from Module 2 practice III, create
a circuit that assumes an input of two 4-bit binary operands A and B given in excess 7
and will compute ((A − 7) + (B − 7) + 7) as follows:
i. Use a full adder/subtractor circuit to compute A − 7.
ii. Use another full adder/subtractor circuit to compute B − 7.
iii. Connect the output of the circuits of parts (i) and (ii) to another full adder/subtractor
circuit in order to add the results of parts (i) and (ii)
Use another full adder/subtractor circuit to add 7 to the result of part (iii) and
connect this result to four output pins.
C. (note: when using your full adder/subtractor circuits, you do not need to use the N,Z,V,C
output flags right now, so do not connect them to anything). Hand in a screen shot of
your schematic.
D. Show the circuit output when the following values are input using the excess 7 represen-
tation:
i. A=+1, B=-2
ii. A=+2, B=+4
iii. A=-1, B=-3
E. Verify the bitwise calculations of your circuit in part D by hand. Is your circuit accom-
plishing the addition of two excess 7 values?
F. Simplify the calculation ((A − 7) + (B − 7) + 7) in order to create a simpler circuit and
re-run your tests from part D.
G. How might this circuit be used if multiplying IEEE754 formatted floating point numbers?