INPUT OUTPUT SYSTEMS

INPUT OUTPUT SYSTEMS

1. Major Functions of I/O Module

   • 1. Control And Timing
     • 2. Processor Communication
       • 3. Device Communication
         • 4. Data Buffering
           • 5. Error Detection

2. External Devices

   • Three Categories
     • 1. Human Readable
       • 2. Machine Readable
         • 3. Communication

3. Techniques For I/O Operatons

   • 1. Programmed I/O
     • 2. Interrupt Driven I/O
       • 3. Direct Memory Access
   • I/O Commands
     • Test
     • Control
     • Read
     • Write

4. I/O Mapping Summary

   • Isolated I/O
     • Separate address spaces
     • Special Commands for I/O
   • Memory Mapped I/O
     • No Special Commands I/O
     • Devices and memory share an address space

5. Device Identification

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

6. Types of Buses

   • Universal Serial Bus (USB)
     • Has gone through multiple generations
     • Is controlled by a root host controller which attaches to devices to create a local network with a hierarchical tree topology
   • FireWire Serial Bus
     • Uses a daisy chain configuration, with up to 63 devices connected off a single port
     • Provides for hot plugging which makes it possible to connect and disconnect peripherals without having to power the computer system down or reconfigure the system

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