Explain segment registers in bus interface unit, Computer Engineering

Assignment Help:

Q. Explain Segment Registers in bus interface unit?

These are very significant registers of CPU. Why? We will answer this later. In 8086 microprocessor memory is a byte organized which is a memory address is byte address. But the number of bits fetched is 16 at an instance. The segment registers are used to compute the address of memory location accompanied by other registers.  The Segment-register is 16 bits long. The BIU comprise four 16-bit registers which follows the CS: Code Segment, the DS: Data Segment, the SS: Stack Segment and ES: Extra Segment. However what is the requirement of the segments: Segments reasonably divide a program in logical entities of Data, Code and Stack each having a particular size of 64 K. A Segment- register holds the upper 16 bits of starting address of a logical group of memory known as the segment. However what are the benefits of using segments? The main benefits of employing segments are:

  • Logical division of program so increasing the overall possible memory use and minimise wastage.
  • Addresses which required to be used in programs are relocatable as they are offsets. So the segmentation supports relocatability.
  • Though size of address is 20 bits however only maximum segment size which is 16 bits requires to be kept in instruction so decreasing instruction length.

 


Related Discussions:- Explain segment registers in bus interface unit

How the simulation is done - Weather simulation, How the simulation is done...

How the simulation is done -  Information from the satellites/sensors sent to computer -  This data is compared to information stored on files ..... -  ..... Which contain kno

What is the main reason to encrypt a file, The main reason to encrypt a fil...

The main reason to encrypt a file is to ? Ans. The main purpose to encrypt a file is to secure that for transmission.

Is it possible to pass data and include program explicitly, Is it possible ...

Is it possible to pass data to and from include programs explicitly? No.  If it is needed to pass data to and from modules it is needed to use subroutines or function modules.

Inheritance, what is Ambiguity in single inheritance

what is Ambiguity in single inheritance

Direct mapped cache - computer architecture, Direct Mapping: In this p...

Direct Mapping: In this particular technique, block j of the primary memory maps onto block j modulo 128 of the cache. The primary memory blocks 0,128,256,...is loaded

Define the term ''page traffic'', The term 'page traffic' describes? An...

The term 'page traffic' describes? Ans. Page Traffic describes the movement of pages in and out of memory.

Web service as opposed to a non-serviced, Can you give an example of when i...

Can you give an example of when it would be appropriate to use a web service as opposed to a non-serviced .NET component? A web service has the following characteristics:  1

Temporary registers w and z, Why the temporary registers W and Z are named ...

Why the temporary registers W and Z are named so I mean we start from A,B,C,D,E then H and L coz H stands for higher bit nd L for lower bit of the address pointed by memory pointer

Porcess of identifying input and output values, Porcess of Identifying Inpu...

Porcess of Identifying Input and Output Values First, recognize what data is going to be used as input to system, and what will be output from system. Input and output values

Define thread cancellation and target thread, Define thread cancellation & ...

Define thread cancellation & target thread.  The thread cancellation is the task of terminating a thread before it has done. A thread that is to be cancelled is often referred

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