Chapter 6 Input/Output

Chapter 6 Input/Output

1. I/O Module

   • I/O controller
   • Device controller

2. External Device

   • Peripheral devices
   • An enternal device connected to an I/O module

3. 3 Categories

   • Human Readable
   • Communication
   • Machine Readable

4. Major Functions of an I/O Module

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

5. 3 Techniques Possible for I/O Operations

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

6. I/O Commands

   • Control
   • Test
   • Write
   • Read

7. Device Identification

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

8. Universal Serial Bus (USB)

   • FireWire Serial Bus