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5/5 - (3 votes)

Points: : 40 points

PART I (8 POINTS)

Assume that X consists of 3 bits, x2, x1, and x0. Write four logic functions that are true if and

only if

(A) X contains only one 0

(B) X contains an even number of 0s

(C) X when interpreted as an unsigned binary number is less than 4

(D) X when interpreted as a signed (two’s complement) number is negative

PART II (8 POINTS)

With x = 01011011 (bin) and y = 00001101(bin) representing two’s complement signed integers,

perform, showing all work:

(A) x + y

(B) x – y

(C) x * y

(D) x/y

PART III (6 POINTS)

Do the unsigned multiply for 0011 * 0111, using the Multiply Algorithm Version 3 (check the

lecture notes). Show the contents of registers for multiplicand (4 bits) and product (8 bits) step

by step.

PART IV (6 POINTS)

Do the unsigned multiply for 0011 * 0111, using the Booth’s Algorithm (check the lecture notes).

Show the contents of registers for multiplicand (4 bits) and product (8 bits) step by step.

PART V (6 POINTS)

In Lecture Notes c335-ALU-1.pdf, we discussed how we could modify the 4-bit ALU to

support detecting overflow but did not give the proof. Now you are expected to prove you

can detect overflow by simply check if Carry into MSB ! = Carry out of MSB.

Hint: you could use a table (like a truth table) to list all situations, then identify the cases that

cause overflows

PART VI (6 POINTS)

Do necessary modifications on the following 1 bit ALU, then use it to construct a 4-bit

ALU that supports the SLT instruction.

Hint: read text appendix B section B.5 to find clue.

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