Input / Output

Input / Output

1. External Device

   • Human Readable
     • Machine Readable
       • Communication

2. Major Functions for I/O Module

   • Control and Timing
     • Processor Communication
       • Device Communication
         • Data Buffering
           • Error Detection

3. Three Techniques for I/O Operation

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

4. I/O Commands

   • Control
     • Test
       • Read
         • Write

5. Device Identification : Four general categories of techniques

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

6. FireWire Serial Bus

   • High Performance serial bus
     • IEEE standard 1394
       • Provide for hot plugging

7. Universal Serial Bus (USB)

   • Multiple Generation
     • Widely use for peripheral connections