hw5_solution

# hw5_solution - My UW | UW Search CS/ECE252 Introduction...

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My UW | UW Search Computer Science Home Page > ~markhill Home Contact Info Schedule LC-3 Simulator Grading Examinations Homework CS/ECE 252  Introduction  to Computer  Engineering Fall 2007 All Sections Instructors Mark D. Hill and Mikko Lipasti TAs Sanghamitra Roy, Eric Hill, Samuel Javner, Natalie Enright Jerger, & Guoliang Jin Homework 5  Solutions Problem 1 Problem 5.2 on page 145 of ItCS using an addressability of 16 bits.(3 points) The MDR is 16 bits. The statement

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does not tell anything about the size of the MAR. Problem 2 Problem 5.4 on page 145 of ItCS using memory consisting of 512 locations. (3 points) a. 9 bits. b. We need to transfer between instructions +-20 locations away. Hence we need 6 bits. c. (PC + 1) = 4, hence PC- relative offset = 6. Problem 3 Problem 5.8 on page 146 of ItCS. (4 points) Increasing the number of registers to 32 will need 5 bits to denote the register number. Now, the minimum number of bits needed for the ADD instruction will be 4 ( for the opcode ) + 3 registers * 5 bits = 19 bits. This cannot fit in the 16-bits allocated for an LC-3 instruction. Problem 4 If the control is redirected to location x4444 after the execution of the following instructions, what should have been the relationship between R1 and R2 before these
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hw5_solution - My UW | UW Search CS/ECE252 Introduction...

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