homework8-solutions(1) - CprE 381 Computer Organization and...

CprE 381 – Computer Organization and
Assembly Level Programming
Fall 2013
Homework # 8
Assigned: Saturday Oct 26
Due: Friday Nov 1, Midnight
Notes:
• Do this week’s reading before you start on the homework.
• Complete the assignment electronically and submit it on BlackBoard Learn.
• Late homework is accepted within three days from the due date. Late penalty is
10% per day.
1. [15] In this exercise we examine in detail how an instruction is executed in a single-cycle
datapath (shown in the following diagram, without the implementation of the j instruction).
Problems in this exercise refer to a clock cycle in which the processor fetches the following
instruction word. Answer those questions for both instructions.
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Instruction word
I.
100011 00010 00011 00000 00000 010000
II.
000100 00001 00011 00000 00000 001100
a. [5] What are the outputs of the sign-extend and the jump “Shift left 2” unit (in the
upper left of Figure 4.24) for this instruction work?