Computer Science > QUESTIONS & ANSWERS > CSEE W3827 Fundamentals of Computer Systems Homework Assignment 5 Solutions/ALL ANSWERS CORRECT,100% (All)

CSEE W3827 Fundamentals of Computer Systems Homework Assignment 5 Solutions/ALL ANSWERS CORRECT,100% SCORE

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CSEE W3827 Fundamentals of Computer Systems Homework Assignment 5 Solutions Prof. Stephen A. Edwards Columbia University Due November 29th, 2011 at 10:35 AM Show your work for each problem; we ... are more interested in how you get your answer than whether you get the right answer. his study rce wasshared via CourseHero.com1. (10 pts.) How many seconds would it take to execute a program with 4.5 × 109 instructions on a 3 GHz processor able to run at 0.9 CPI? 4.5 × 109 instructions · 0.9 cycles instruction 3 × 109 cycles second = 1.35 s 2. (30 pts.) Modify the single-cycle MIPS processor shown on the next page to implement the lb (“Load byte”) and lbu (“Load Byte Unsigned”) instructions. They are encoded as shown below lb rt, offset(base) LB base rt offset 1 0 0 0 0 0 lbu rt, offset(base) LBU base rt offset 1 0 0 1 0 0 These instructions add the contents of the base register to a sign-extended offset immediate to form an address, fetch a byte from that address, and finally write the byte into the rt register. The two instructions differ in how they handle the top 24 bits. lb treats the byte as a signed value and sign-extends the most significant bit of the byte across the top 24 bits; lbu treats the byte as unsigned and simply fills the top 24 bits of rt with 0’s. Start from the base single-cycle processor shown on the next page and add components to the datapath, name any new control signals, and show how to add to or modify the main decoder to accommodate these new instructions. his study rce wa [Show More]

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