Computer Organisation and Architecture - Vol 3 | 25. Programmed I/O Overview by Abraham | Learn Smarter
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Knowledge
25. Programmed I/O Overview

The chapter discusses the intricacies of Input/Output (I/O) operations, focusing on programmed I/O techniques and the necessity of I/O modules. It outlines the requirements for I/O commands, addressing schemes, and the distinction between memory-mapped I/O and isolated I/O. The significance of I/O modules is emphasized due to their need for managing diverse devices without directly connecting them to the CPU.

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Sections

  • 25.1

    Programmed I/o Overview

    This section provides an overview of programmed I/O, outlining the steps involved in CPU-I/O device communication, the polling mechanism’s inefficiency, and I/O addressing schemes.

    Learning Practice

  • 25.1.1

    Problems With Polling

    The section discusses the inefficiencies of polling in CPU operations, particularly in the context of I/O operations.

    Learning Practice

  • 25.1.2

    Steps In Programmed I/o

    This section discusses the key steps involved in programmed I/O, highlighting the need for status checking and data transfer, while addressing CPU inefficiencies.

    Learning Practice

  • 25.1.3

    Basic Requirements For I/o Operations

    This section discusses the basic requirements for input/output operations, including programmed I/O and I/O addressing schemes.

    Learning Practice

  • 25.2

    I/o Command Issues

    This section covers the status checking mechanisms of input/output operations, highlighting the challenges of CPU polling and introducing programmed I/O functionality.

    Learning Practice

  • 25.2.1

    Identifying The I/o Module

    This section details the processes involved in interacting with Input/Output (I/O) modules, focusing on programmed I/O techniques and addressing schemes.

    Learning Practice

  • 25.2.2

    Control Commands

    This section covers the significance and mechanics of control commands in I/O operations, including programmed I/O and the addressing schemes for devices.

    Learning Practice

  • 25.2.3

    Mode Of Transfer

    This section discusses the mechanisms by which data transfer occurs between the CPU and I/O devices, including programmed I/O and the significance of addressing and control commands.

    Learning Practice

  • 25.25.2.4

    Categories Of I/o Commands

    This section explains the categories of I/O commands, highlighting the differences between programmed I/O, memory mapped I/O, and isolated I/O in data transfer.

    Learning Practice

  • 25.3

    Addressing I/o Devices

    This section discusses the methods for managing input/output devices within a computer system, focusing on programmed I/O, addressing schemes, and the roles of I/O modules.

    Learning Practice

  • 25.3.1

    Addressing Scheme

    This section discusses the addressing scheme used in I/O operations, emphasizing the difference between memory-mapped and isolated I/O.

    Learning Practice

  • 25.3.2

    Mapping I/o Devices

    This section discusses the mapping of I/O devices to a CPU, including programmed I/O and the differences between memory-mapped and isolated I/O.

    Learning Practice

  • 25.3.3

    Memory-Mapped I/o Vs Isolated I/o

    This section discusses the differences between memory-mapped I/O and isolated I/O, explaining how they manage device communication with the CPU.

    Learning Practice

  • 25.4

    I/o Command Execution

    This section covers the essentials of I/O command execution, focusing on programmed I/O techniques, addressing schemes, and the differences between memory-mapped and isolated I/O.

    Learning Practice

  • 25.4.1

    Functionality Of Memory-Mapped I/o

    This section discusses the functionality of memory-mapped I/O, focusing on the communication between CPU and I/O devices, the addressing schemes, and their significance.

    Learning Practice

  • 25.4.2

    Functionality Of Isolated I/o

    This section discusses the functionality of isolated I/O in computer systems, including its operations, addressing schemes, and differences from memory-mapped I/O.

    Learning Practice

  • 25.4.3

    Special I/o Commands

    This section discusses the mechanisms and commands used for Input/Output (I/O) operations in computer processing, focusing on programmed I/O and different addressing schemes.

    Learning Practice

  • 25.5

    Device Service Routine

    This section provides an overview of programmed input/output operations and how CPUs interact with I/O devices through service routines.

    Learning Practice

  • 25.5.1

    Execution Of Device Service Routine

    The section discusses the mechanics of executing a device service routine, focusing on programmed I/O and interaction between the CPU, I/O module, and devices.

    Learning Practice

  • 25.6

    Test Items

    This section covers the fundamentals of I/O operations, including programmed I/O, the use of I/O modules, and the addressing schemes used for I/O devices.

    Learning Practice

  • 25.6.1

    Questions Addressing Objectives

    This section discusses programmed I/O, its challenges, addressing schemes, and the steps involved in I/O operations.

    Learning Practice

References

36 part c.pdf

Class Notes

Memorization

What we have learnt

  • CPU cannot multitask while ...
  • I/O modules manage communic...
  • Two primary addressing sche...

Final Test

Revision Tests