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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.
Sections
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.
This section covers the status checking mechanisms of input/output operations, highlighting the challenges of CPU polling and introducing programmed I/O functionality.
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.
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.
This section provides an overview of programmed input/output operations and how CPUs interact with I/O devices through service routines.
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.
CPU cannot multitask while waiting for I/O operations, leading to wasted processing time.
I/O modules manage communication between the CPU and devices, enabling efficient data transfer.
Two primary addressing schemes for I/O devices exist: memory-mapped I/O and isolated I/O.
Programmed I/O
A method of I/O transfer where the CPU actively waits and checks the status of I/O devices to proceed with data transfer.
I/O Modules
Components that facilitate communication between the CPU and I/O devices, essentially acting as intermediaries to offload tasks from the CPU.
MemoryMapped I/O
A system where I/O devices share the same address space as memory, allowing the CPU to communicate with devices using standard read and write instructions.
Isolated I/O
A scheme where I/O devices have a separate address space from memory, requiring specific control signals to access either memory or I/O devices.
Practice Exercises
Total Questions
2
Estimated Time
4 min
Passing Score
70%
Instructions
- Read each question carefully
- You can use hints if you need help
- Complete all questions before submitting