Answered: 1. You are executing an instruction,…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

1. You are executing an instruction, SUB $s0, $s1,$s2 (address 0x20). Draw the datapath of this instruction when $s1=10, $s2 =5. What are the stages in this datapath? Mark the components which are active in corresponding stages.

Expert Solution

Step 1

Data path

SUB $s0, $s1,$s2
Data path consists of functional units of processor.

For holding data: PC, Register file, Instruction memory

For operation: ALU, Adders

For data transfer: Buses

Steps:

1. Instruction fetch: Fetch current instruction from memory(Use address in the Program counter PC)

2. Instruction decode: Find the fields in the instruction

3.Instruction execution: Execute the operation

4. Update PC to fetch next instruction from memory

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