Input/Output

Input/Output

1. External Device

   • Human Readable
   • Machine Readable
   • Communication

2. Keyboard

   • User provides input through the keyboard

3. Programmed I/O

4. Interrupt-driven I/O

5. 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. Device Identification

   • Multiple interrupt lines
   • Software poll
   • Daisy chain (hardware poll, vectored)
   • Bus arbitration (vectored)

9. USB

   • Widely used for peripheral connections
   • default interface for slower speed devices
   • Commonly used high-speed I/O

10. FireWire Serial Bus

    • IEEE standard 1394, for a High Performance Serial Bus
    • Uses a daisy chain configuration, with up to 63 devices connected off a single port
    • Uses a daisy chain configuration, with up to 63 devices connected off a single port