Expansion Bus

 Expansion Bus

                           The buses that connect CPU  to the peripheral device are called expansion buses are typically 16to 64 bits wide and are mounted on motherboard. these buses connect CPU to expansion slot on motherboard to which external devices may be connected. The expansion bus allows the processor the communicate which peripheral devices to the attached to the card. Expansion buses provide faster transfer speeds and wider bit widths for higher data transfer rates to the many peripheral devices. The common expansion buses include PCI and PCI Express (PCIe) buses, Universal Serial Bus (USB) and Fire Wire.

 PCI Bus:

                    PCI stands for Peripheral Component Interconnect. PCI bus has been one of  the most common type of expansion buses in past years. PCI was originally developed to meet video demands of  graphical user interface. PCI is a high speed 32-bit or 64-bit bus that is over 20 times faster than ISA bus.

PCI Express (PCIe) bus:

                                                    The PCI Express (PCIe) bus is an expansion bus that doubles the speed  of the original  PCI bus. PCI Express bus is used by almost all video cards, hard disk and network cards. The Express Card technology used in traditional notebook computer and Tablet PCs also works with with PCI Express bus.

USB:

              USB stands for Universal Serial Bus. It eliminate the needs to install cards into expansion slots. Many USB devices can be attached to computer with single USB port. USB buses are widely used to support high speed scanners, printers and video capturing devices.

ISA Bus:

                 ISA stands for Industry Standard Architecture. It has been around since 1984. It was developed for IBM personal computer. It is the most common and slower expansion bus ISA bus transmits 8 or 16 bits at one time.