ch4 part A - EEL 3801 EEL 3801 Computer Organization...

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Unformatted text preview: EEL 3801 EEL 3801 Computer Organization Computer Organization Spring 2010 Spring 2010 Chapter 4 Chapter 4 Input/Output Organization Input/Output Organization Hamacher et al , Computer Organization Acknowledgment and appreciation for various slide materials from Dr. Philip Wilsey, Dr. Randy Katz, Dr. Philip Leong Slide 1 of 17 Input Devices Keyboard/Mouse Optical input devices- Card Reader- Paper Tape Reader- Bar code reader Magnetic Input Devices- Magnetic Stripe Reader Screen Input Devices- Touch Screen- Light Pen Analog Input Devices Output Devices Card Puncher, Paper Tape Puncher CRT Printer/Plotter Peripheral Devices- wide variety of peripherals- delivering different amounts of data- at different speeds- in different formats- all slower than CPU and RAM Slide 2 of 17 Single Bus Structure Processor Memory I/O device 1 I/O device n Bus Slide 3 of 17 Addressing s Memory mapped I/O devices and memory share the same address space s Move DATAIN, R0 s Move R0, DATAOUT s IA-32 can use memory-mapped I/O and/or 16-bit I/O address space with special I/O instructions Slide 4 of 17 I/O Interface I/O Bus Address lines Data lines Control lines Figure 4.2. I/O interface for an input device. interface decoder Address Data and status registers Control circuits Input device Slide 5 of 17 Example KEN SOUT CONTR OL DATAIN Figure 4.3. Registers in keyboard and display interfaces. DEN DATAOUT 7 KIRQ SIN STATUS 6 5 4 3 2 1 DIRQ Slide 6 of 17 Sample Program s This is an example of p r o g r a m- c o n t r o l l e d IO s The processor polls the device Move #LINE,R0 Initialize memory pointer....
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This note was uploaded on 04/02/2010 for the course EEL 3801 taught by Professor Froosh during the Spring '08 term at University of Central Florida.

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ch4 part A - EEL 3801 EEL 3801 Computer Organization...

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