CoolInterview.com - World's Largest Collection of Interview Questions & Answers, FAQs, queries, sample papers, exam papers, dumps, what, why, how, where, when questions
Our Services
Get 9,000 Interview Questions & Answers in an eBook.




Get it now !!
Send your Resume to 6000 Companies

Search Interview Questions

Question: Difference between memory mapped IO and IO mapped IO?

Answer: Memory mapped IO is one where the processor and the IO device share the same memory location(memory) while IO mapped IO is one where the processor and the IO device have different memory located to each other.



Category 8085 Interview Questions & Answers - Exam Mode / Learning Mode
Rating (3.5) By 73 users
Added on 10/31/2012
Views 2134
Rate it!
Question: Difference between memory mapped IO and IO mapped IO?
Answer:

Memory mapped IO is one where the processor and the IO device share the same memory location(memory) while IO mapped IO is one where the processor and the IO device have different memory located to each other. Source: CoolInterview.com

Answered by: mukund jahagirdar | Date: 1/29/2008 | Contact mukund jahagirdar Contact mukund jahagirdar

In memory mapped I/O the I/O devices are mapped(identify for communication) through memory address. The address of the port will stored in memory locations. In I/O mapped I/O devices are mapped using the the port address. Source: CoolInterview.com

Answered by: Kesavadev | Date: 2/17/2008 | Contact Kesavadev Contact Kesavadev

In memory mapped io we use locations of memory interfaced as an address to IO devices whereas in IO mapped IO we use 8-bit address to interface io.
In memory mapped io we can use all instructions for data flow whereas in io mapped io we can use only two instructions i.e IN and OUT. Source: CoolInterview.com

Answered by: deepak patil | Date: 3/6/2008 | Contact deepak patil Contact deepak patil

Memory-mapped I/O uses the same address bus to address both memory and I/O devices, and the CPU instructions used are same for accessing the memory and also accessing devices. In order to accommodate the I/O devices, areas of CPU's addressable space must be reserved for I/O.

IN IO mapped IO special class of CPU instructions are used for performing I/O./O devices have a separate address space from general memory, either accomplished by an extra "I/O" pin on the CPU's physical interface, or an entire bus dedicated to I/O.

Source: CoolInterview.com

Answered by: surjith.s | Date: 5/27/2009 | Contact surjith.s Contact surjith.s

In memory-mapped I/O single set of read and write lines are used while in I/O mapped I/O different set of read and write lines are used.
In memory mapped I/O same set of memory instructions are used whereas in I/O mapped I/O distinct set of instructions are used by input/output device or memory unit.
In memory mapped I/O decision making is difficult whereas its easy in later one. Source: CoolInterview.com

Answered by: Anni | Date: 6/8/2010 | Contact Anni Contact Anni


If you have the better answer, then send it to us. We will display your answer after the approval

Rules to Post Answers in CoolInterview.com:-

  • There should not be any Spelling Mistakes.
  • There should not be any Gramatical Errors.
  • Answers must not contain any bad words.
  • Answers should not be the repeat of same answer, already approved.
  • Answer should be complete in itself.

Post your answer here

Inform me about updated answers to this question.
Related Questions
View Answer
what are assembler and cross assembler?
View Answer
Define interrupt?
View Answer
How to pass values from one jcl to another jcl, if how ?
How to pass data from cobol to jcl?
How to access jcl from cobol?
How to display comp fields?

View Answer
Is it passible in winnrunner to handle result dir path through winnrunner script?
View Answer
There is an object that provides one point access to page, request, response, session, out, exception, config and application. What is that object or mechanism? Is it pageContext, if so give an example.

View Answer
What is the difference between Generic servlet and HTTPServlet

View Answer
Why java does not support Multiple Inheritance?
Why java is not pure Object Oriented?

View Answer
How EjbQL ara impemented when it is necessary?

View Answer
How to handle date problem if application server and database server has different date format?
View Answer
What are the blocking and nonblocking assignments in Verilog and which is preferred in Sequential circuits?
View Answer
It takes Mr. Karthik y hours to complete typing a manuscript. After 2 hours, he was called away. What fractional part of the assignment was left incomplete?
View Answer
Julius and Vincent are brothers. "We are born within the same hour," says Julius, "on the same day of the same year." "But," says Vincent, "we are no twins!" How is this possible?
View Answer
WHat are * and ? when using them for wildcards in Windows? *
View Answer
What is the difference between primary & secondary storage device?
View Answer
Give examples for 8 / 16 / 32 bit Microprocessor?
View Answer

Please Note: We keep on updating better answers to this site. In case you are looking for Jobs, Pls Click Here Vyoms.com - Best Freshers & Experienced Jobs Website.

View All 8085 Interview Questions & Answers - Exam Mode / Learning Mode




India News Network
Latest 20 Questions
An offer which is open for acceptance over a period of time is: (a) Cross Offer (b) Counter Offer (c) Standing Offer (d) Implied Offer
Specific offer can be communicated to__________ (a) All the parties of contract (b) General public in universe (c) Specific person (d) None of the above
_________ amounts to rejection of the original offer. (a) Cross offer (b) Special offer (c) Standing offer (d) Counter offer
A advertises to sell his old car by advertising in a newspaper. This offer is caleed: (a) General Offer (b) Special Offer (c) Continuing Offer (d) None of the above
In case a counter offer is made, the original offer stands: (a) Rejected (b) Accepted automatically (c) Accepted subject to certain modifications and variations (d) None of the above
In case of unenforceable contract having some technical defect, parties (a) Can sue upon it (b) Cannot sue upon it (c) Should consider it to be illegal (d) None of the above
If entire specified goods is perished before entering into contract of sale, the contract is (a) Valid (b) Void (c) Voidable (d) Cancelled
______________ contracts are also caled contracts with executed consideration. (a) Unilateral (b) Completed (c) Bilateral (d) Executory
A offers B to supply books @ Rs 100 each but B accepts the same with condition of 10% discount. This is a case of (a) Counter Offer (b) Cross Offer (c) Specific Offer (d) General Offer
_____________ is a game of chance. (a) Conditional Contract (b) Contingent Contract (c) Wagering Contract (d) Quasi Contract
There is no binding contract in case of _______ as one's offer cannot be constructed as acceptance (a) Cross Offer (b) Standing Offer (c) Counter Offer (d) Special Offer
An offer is made with an intention to have negotiation from other party. This type of offer is: (a) Invitation to offer (b) Valid offer (c) Voidable (d) None of the above
When an offer is made to the world at large, it is ____________ offer. (a) Counter (b) Special (c) General (d) None of the above
Implied contract even if not in writing or express words is perfectly _______________ if all the conditions are satisfied:- (a) Void (b) Voidable (c) Valid (d) Illegal
A specific offer can be accepted by ___________. (a) Any person (b) Any friend to offeror (c) The person to whom it is made (d) Any friend of offeree
An agreement toput a fire on a person's car is a ______: (a) Legal (b) Voidable (c) Valid (d) Illegal
"Holiday Packages" announced as an advertisement are an example of _________: (a) Offer (b) Counter Offer (c) Invitation to Offer (d) None of the above
A match fixing contract between a player and a broker is a: (a) Valid Contract (b) Unenforceable Contract (c) Void Contract (d) Illegal Contract
When a bookseller sells a book on cash payment then it is called as ___________: (a) Unilateral Contract (b) Bilateral Contract (c) Executed Contract (d) Executory Contract
____________ agreements are created by situation: (a) Written (b) Oral (c) Void (d) Implied
Cache = 0.014648 Seconds