Explain the fetch cycle, Computer Engineering

Assignment Help:

Q. Explain the Fetch Cycle?

The beginning of every instruction cycle is the fetch cycle and causes an instruction tobe fetched from memory.  

The fetch cycle comprises four micro-operations which are executed in three timing steps. The fetch cycle can be written as:

T1:  MAR ← PC

T2:  MBR ← [MAR]

         PC    ← PC + I

T3:  IR      ← MBR

Where I is the instruction length. We presume that a clock is available for timing purposes and that it produces regularly spaced clock pulses. Every clock pulse defines a time unit. So all the units are of equal duration. Every micro-operation can be performed within the time of a single time unit. Notation (T1, T2, T3) represents successive time units. What is done in these time units?

  • In the first time unit the content of PC is moved to MAR.
  • In the second time unit contents of memory location specified by MAR is moved to MBR and contents of PC is incremented by I.
  • In the third time unit content of MBR is moved to IR.

 


Related Discussions:- Explain the fetch cycle

Explain remote procedure call, Explain Remote Procedure Call. RPC (Remo...

Explain Remote Procedure Call. RPC (Remote Procedure Call) : The facility which was created to help the programmers write client -server software is termed as Remote Procedu

What is requisitepro, Rational RequisitePro is a needed management tool tha...

Rational RequisitePro is a needed management tool that helps project teams control the development process. RequisitePro organizes your requirements by linking Microsoft Word to a

What is java swing, Swing is a GUI toolkit for Java. It is one kind of the ...

Swing is a GUI toolkit for Java. It is one kind of the Java Foundation Classes (JFC). Swing haves graphical user interface (GUI) widgets such as text boxes, buttons, split-panes, a

Explain performance evaluation in parallel computing, Explain Performance E...

Explain Performance Evaluation in parallel Computing In this section, we will discuss the key attributes used to measure performance of a computer system. The performance chara

Calculate max distance so subscriber get speech reproduction, In a subscrib...

In a subscriber loop that contains a series resistance of 300 ohms to protect the batteries in the exchange, a normalized telephone draws 10 mA and its standard input d.c. resistan

Where protocol operates to monitor and control n/w devices, Protocol used t...

Protocol used to monitor and control network devices operates at? Protocol operates at application layer to monitor and control network devices operates.

What is object orientation, What is object orientation? Object orientat...

What is object orientation? Object orientation means that we classify software as a collection of discrete objects that incorporate with together DS and behaviour. Four aspe

Compare the cocomo model with the detailed cocomo model, Compare the basic ...

Compare the basic COCOMO model with the detailed COCOMO model. COCOMO having of a hierarchy of three increasingly detailed and accurate forms. -  Basic COCOMO - is a stati

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd