Computer Organization and Design: The Hardware/Software Interface

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1 University of California, Berkeley College of Engineering Computer Science Division EECS Spring 1999 John Kubiatowicz Homework Quiz (HW #3) March 1, 1999 CS152 Computer Architecture and Engineering This quiz covers one of the problems from homework #3. Good Luck! Your Name: SID Number: Discussion Section: Total:
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2 Combinational Multipliers built with Carry Save Adders In your homework, you learned about using Carry Save Adders to perform multiplication. Below we review using carry save adders to add four 3-bit numbers to produce a single 5-bit number: Figure 1: Adding four 3-bit numbers with carry-save adders. Carry Save Adder 3=>2 I 1 I 2 S 0 S 1 I 3 Carry Save Adder 3=>2 I 1 I 2 S 0 S 1 I 3 Carry Save Adder 3=>2 I 1 I 2 S 0 S 1 I 3 0 C 2 Carry Save Adder 3=>2 I 1 I 2 S 0 S 1 I 3 Carry Save Adder 3=>2 I 1 I 2 S 0 S 1 I 3 Carry Save Adder 3=>2 I 1 I 2 S 0 S 1 I 3 S 0 S 1 S 2 S 3 S 4 Carry Save Adder 3=>2 I 1 I 2 S 0 S 1 I 3 Carry Save Adder 3=>2 I 1 I 2 S 0 S 1 I 3 0 Carry Save Adder 3=>2 I 1 I 2 S 0 S 1 I 3 B 2 A 2 C 1 B 1 A 1 C 0 B 0 A 0 D 0
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