Lec9_IOcontrol_1011 - Lecture 9 Input/Output Control CC2202...

Info iconThis preview shows pages 1–9. Sign up to view the full content.

View Full Document Right Arrow Icon
CC2202 1 Lecture 9 Input/Output Control
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
CC2202 2 Input/Output Requirement To provide a systematic means of controlling interaction with the outside world; and To provide the OS with the information it needs to manage I/O activity effectively. Problems Wide variety of peripherals Delivering different amounts of data At different speeds In different formats All slower than CPU and RAM Need I/O modules
Background image of page 2
CC2202 3 Input/Output Module Interface to CPU and Memory Interface to one or more peripherals I/O Module CPU Printer Scanner Memory System Bus
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
CC2202 4 External Devices External Devices Peripheral Device or Peripherals A wide assortment of external devices that provide a means of exchanging data between the external environment and the computer system Categories Human readable Screen, printer, keyboard Machine readable Monitoring and control Communication Modem Network Interface Card (NIC)
Background image of page 4
CC2202 5 External Device Block Diagram Control signals Determine the function Data Status Signals indicate the State of the device Transducer is a device that is actuated by power from one system and supplies power usually in another form to a second system. For example, a loudspeaker is a transducer that transforms electrical signals into sound energy.
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
CC2202 6 Typical I/O Data Rates
Background image of page 6
CC2202 7 I/O Module Function CPU Communication Device Communication Data Buffering Error Detection
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
CC2202 8 I/O Steps 1. CPU checks I/O module device status 2. I/O module returns status
Background image of page 8
Image of page 9
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 08/18/2011 for the course COMP 3868 taught by Professor Keithchan during the Summer '97 term at Hong Kong Polytechnic University.

Page1 / 28

Lec9_IOcontrol_1011 - Lecture 9 Input/Output Control CC2202...

This preview shows document pages 1 - 9. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online