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Input output Devices and Modules in Computer
This document discusses input/output devices, modules, and techniques. It describes human readable devices like displays and printers, machine readable devices like disks and sensors, and communication devices. Input/output modules are described as having functions like control and timing, processor communication, device communication, data buffering, and error detection. Common input/output techniques discussed are programmed I/O, interrupt driven I/O, and direct memory access.
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Input output Devices and Modules in Computer
- 1. INPUT OUTPUT 1- Devices 2-Modules 3- Techniques
- 2. GROUP MEMBERS •Ammar Shaukat11011519-073 •Sadam Husain 11011519-037 •Taimur Hassan NOT FOUND
- 3. INPUT OUTPUT DEVICES •HumanReadable •Machine Readable •Communication
- 4. HUMAN READABLE 1-Interact withhuman e.g, video display termilnals , Printers
- 5. MACHINE READABLE •Communicate withequipment •E.g, Magnetic disk , tape , DVD , Sensors etc
- 6. COMMUNICATION •Communicate with remotedevices • Structure:
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- 9. MODULES FUNCTOINS •Control Andtiming •Processor Communication •Device Communication •Data Buffering •Error Detection
- 10. CONTROL AND TIMING •Tocoordinate the flow of traffic between internal resources and external devices. •E.g, Switching of task from execution to I/0
- 11. PROCESSOR COMMUNICATION •I/O Modulemust communicate with the processor and with the external device. •Command decoding: ( module accepts the command from processor and sent signals on control bus ) e,g READ , WRITE , SCAN etc
- 12. PROCESSOR COMMUNICATION •Data: ( exchangeof data between Processor and module ) •Status reporting: ( BUSY , READY ) •Address recognition: ( I/O Module must recognize a unique address for each Peripheral it controls )
- 13. DEVICE COMMUNICATION •I/O Modulemust be able to perform device communication This involve •Commands •Status •Data
- 14. DATA BUFFERING •I/O Modulemust be able to communicate at both Device and Memory Speeds
- 15. ERROR DETECTION •Different errordetection techniques used •Report error: bad disk track or paper jam •Error techniques: Parity bit etc
- 16. MODULE STRUCTURE •Signal Lines(system bus lines): Connection with rest of computer •Logic: Interact with the processor Sturcture
- 18. INPUT OUTPUT TECHNIQUES •ProgrammedI/O •Interrupt Driven I/O •Direct Memory Access
- 19. PROGRAMMED I/O •Sequential mannerProcessing with module •Direct control of Input output operation •Disadvantage: Processor time wastage
- 20. INTERRUPT DRIVEN I/O •ProcessorIssues a command to I/O module and continues other instructions Does not wait completion of that I/O operation.
- 21. DISADVANTAGE INTERRUPT DRIVEN I/O •Processortime wasting but less than programmed… •Processor keeps engaged in every read or write operation from input output module.
- 22. DIRECT MEMORY ACCESS •Module access the main memory directly without involving the processor. •And processor continue its execution without interruption after reading or writing a word.
- 23.
Editor's Notes
- #9 Here you’ll discuss about the general structure of module