Chapter 6 : Input / Output

Chapter 6 : Input / Output

1. External Devices

2. THREE CATEGORIES

   • Human Readable
     • Machine Readable
       • Communication

3. KEYBOARD / MONITOR

   • International Reference Alphabet (IRA)
     • Keyboard Codes

4. MAJOR FUNCTION FOR AN I/O

   • Control and timing
     • Processor communication
       • Device Communication
         • Data Buffering
           • Error Detection

5. PROGRAMMED I/O

   • Interrupt driven I/O
     • Direct memory access (DMA)

6. I/O COMMANDS

   • Control
     • Test
       • Read
         • Write

7. I/O MAPPING SUMMARY

   • Memory mapped I/O
     • Isolated I/O

8. INTERRUPT DRIVEN I/O

9. DESIGN ISSUES

10. DEVICE IDENTIFICATION

    • Multiple interrupt lines
      • Software poll
        • Daisy chain
          • Bus arbitration

11. EVOLUTION OF THE I/O FUNCTION

12. UNIVERSAL SERIAL BUS (USB)

13. FIREWIRE SERIAL BUS