Please help in regards to operating systems1. The processor checks for an interrupt at the beginning of each fetch cycle (or at the end of each execute cycle). If there is an unmasked interrupt, the processor has to handle the interrupt(s) first, before fetching the next instruction. Modify the first part of figure 1.1 so that it reflects this notion. ( Naghibzadeh, Page8 #1) To fetch an instructionis to bring the instructionfrom the main memory tothe CPU's instructionregister and performingsome preliminary actionslike adjusting PC anddecoding the instruction(i.e., finding out whatoperation it is.) Fetchmay also be used forbringing a datum frommain memory to one ofthe CPU's registers.Fetch cycleRead the instruction pointed outby the Program Counter (PC)register from main memory andmove it to the CPUFind out what this instruction isAdjust PC for the next instructionExecute cycleMove the data upon which theinstruction has to be executed frommain memory to the CPU.Execute the instruction, i.e.,perform what is requested by theinstruction. Perhaps this mayreadjust the PC.Figure 1.1: A simplified functional model of a computer hardware

Fetch cycle: Fetch Cycle is the process of fetching instructions from the memory and executing them.…

Answered: To fetch an instruction is to bring the…

Database System Concepts

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ISBN:9780078022159

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

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

Chapter1: Introduction

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Please help in regards to operating systems

1. The processor checks for an interrupt at the beginning of each fetch cycle (or at the end of each execute cycle). If there is an unmasked interrupt, the processor has to handle the interrupt(s) first, before fetching the next instruction. Modify the first part of figure 1.1 so that it reflects this notion. ( Naghibzadeh, Page8 #1)

To fetch an instruction
is to bring the instruction
from the main memory to
the CPU's instruction
register and performing
some preliminary actions
like adjusting PC and
decoding the instruction
(i.e., finding out what
operation it is.) Fetch
may also be used for
bringing a datum from
main memory to one of
the CPU's registers.
Fetch cycle
Read the instruction pointed out
by the Program Counter (PC)
register from main memory and
move it to the CPU
Find out what this instruction is
Adjust PC for the next instruction
Execute cycle
Move the data upon which the
instruction has to be executed from
main memory to the CPU.
Execute the instruction, i.e.,
perform what is requested by the
instruction. Perhaps this may
readjust the PC.
Figure 1.1: A simplified functional model of a computer hardware

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