Computer Organization and Design: The Hardware/Software Interface

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Unformatted text preview: 1 University of California, Berkeley College of Engineering Computer Science Division EECS Spring 1999 John Kubiatowicz Homework Quiz (HW #3) Solutions 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: 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 S 1 I 3 Carry Save Adder 3=>2 I 1 I 2 S S 1 I 3 Carry Save Adder 3=>2 I 1 I 2 S S 1 I 3 C 2 Carry Save Adder 3=>2 I 1 I 2 S S 1 I 3 Carry Save Adder 3=>2 I 1 I 2 S S 1 I 3 Carry Save Adder 3=>2 I 1 I 2 S S 1 I 3 S S 1 S 2 S 3 S 4 Carry Save Adder 3=>2 I 1 I 2 S S 1 I 3 Carry Save Adder 3=>2 I 1 I 2 S S 1 I 3 Carry Save Adder 3=>2 I 1 I 2 S S 1 I 3 B 2 A 2 C 1 B 1 A 1 C B A D D 1 D 2 3 1. Draw a complete 4 x 4 multiplier that takes two four-bit numbers (call the input bits A3...
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This homework help was uploaded on 01/29/2008 for the course CS 152 taught by Professor Kubiatowicz during the Spring '04 term at University of California, Berkeley.

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sp99 homequiz 3 solution - 1 University of California,...

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