BUS

BUS

1. In computer architecture

   • is a communication system
   • transfers data between components inside a computer
   • transfers data between computers too

2. This consists of wires or tracks on a printed circuit, resistors ,capacitors and integrated circuits

3. In the first computers, the buses were parallel type

4. The communication is toward using tapes or tracks requiring only input and output ports

5. Now the serial buses are used, they are faster and more effective.

6. it define its capacity according to the maximum frequency of shipping

   • + frequency - data width

7. have special functions

   • interruptions
   • DMA allows a device to access CPU

8. There were 2 sets of buses, one for memory and one for other devices

9. Types of buses

   • parallel
     • Send data bytes while
     • was used for the processor, hard drive, expansion cards
   • serial
     • The data is sent bit by bit
     • Is now used for hard drives, processors and expansion cards
   • IDE Integrated device electronics
     • Controlling mass storage devices
     • Flat Cable 40/80 thread
     • Connects two devices
   • ATA Advanced technology attachment
     • 7-wire ribbon cable
     • parallel PATA
       • fast transfers
       • Connect HDD / Optical Drives
     • serial SATA
       • Connect one device per port
   • PCI Peripheral Component Interconnect
     • Expansion Bus
   • PCI EXPRESS
     • Combine speed, double the PCI
     • integrated circuit or card expansion

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