Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Q. Interrupt - Driven Input-output?
Problem with programmed I/O is that processor has to wait a long time for I/O interface to see whether a device is free or waits until completion of I/O. Result is that the performance of processor goes down extremely. What is the solution? What about processor going back to do other useful work without waiting for I/O device to finish or get freed up? However how will processor be intimated about completion of I/O or a device is ready for I/O? A well-organized mechanism was considered for this which is referred to as interrupt-driven I/O. In this mechanism provision of interruption of processor work once device has completed I/O or when it's ready for I/O has been provided.
Interrupt-driven I/O mechanism for transferring a block of data is displayed in Figure 5(b). Please note after issuing a read command (for input) CPU goes off to do some other useful work whereas I/O interface proceeds to read data from connected device. On completion of an instruction cycle CPU checks for interrupts (that will happen when data is in data register of I/O interface and it now requires CPU's attention). Now CPU saves important register and processor status of executing program in a stack and requests I/O device to provide its data that is placed on data bus by I/O device. After taking needed action with data CPU can go back to program it was executing before interrupt.
Before we take a detailed look about the Motorola 68HC11 series of micro controllers it is useful to define what is meant by a micro controller. As the name suggests a micro contro
Difference between Vertical and Horizontal Organization Vertical Organizations It is a usual approach which is typified by a functional approach to work in which departme
Parallel Virtual Machine (PVM): PVM (Parallel Virtual Machine) is portable message passing programming system which is designed to link different heterogeneous host machines to
Q. Explain about Threads Model - programming model? In this model a single process can have many as well as concurrent execution paths. The main program is planned to run by na
Suupose a stack-oriented processor that haves the stack operations PUSH and POP. Arithmetic operations automatically involve the top one or two stack elements. Starting with an
Define Edge Triggered D flip-flop? D latch has only two inputs C(control) and D(data). The operation of a D flip-flop is a lot simpler and it has only one input addition to the
What is non-repudiation? Non Repudiation: Assurance that the sender is given with proof of delivery and that the recipient is provided with proof of the sender's identity so th
Q. What do you mean by Daisy chain? This scheme provides a hardware poll. With this scheme, an interrupt acknowledge line is chain by different interrupt devices. All I/O inter
A computer system provides protection using the Bell-LaPadula policy. How would a virus spread if A) the virus were placed on the system at system low (the compartment that all o
5-pin DIN connector: It is the connector of conventional keyboard which have 5 pins (2 IN, 2 OUT and one ground pin) used for transfer and synchronization.
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!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd