TYPES OF I/O BUSES

•      * ISA Industry Standard Architecture

•      MCA Micro Channel Architecture

•      EISA Extended Industry Standard Architecture

•      VL-Bus VESA Local Bus

•      * PCI Peripheral Component Interconnect

•      * AGP Accelerated Graphics Port

•      * USB Universal Serial Bus (CH 17)

•      *Firewire, i.Link (IEEE-1394) (CH 17)

•      * PC-Card (PCMCIA)

•      CRN (Communications Network Riser) or AMR

ISA

•      8-bit

•      16-bit

•      8 MHz

•      Bandwidth= 8M/sec

MCA

•      32-bit and 16-bit bus

•      IBM PS/2 computers

•      Technically a superior bus

•      Not compatible with the ISA bus

•      IBM charges royalties for MCA and retroactive royalties for ISA

 

EISA

•      COMPAQ’s response to IBM

•      32-bit slot + ISA slots

•      Expensive, slow speed

 

LOCAL BUSES

•      VL-BUS

–   Dependency on a 486 CPU

•      *PCI

•      *AGP

 

PCI

•      32-bit, 33MHz, Bandwidth=132MB/s

•      New PCI specifications:

–   64-bit, 66MHz, Bandwidth= 528MB/s

•   Chipset 840

–   PCI-X 64-bit, 133MHz, Bandwidth=1GB/s

•   Compaq

 

 

 

AGP

•      dedicated video interface

•      32-bit

•      66 MHz

•      bandwidth

–    266M/sec

–     2x=533M/sec

–    4x= 1066M/sec

 

 

USB

•      127 devices

•      USB 1.1 12Mbit/sec (1.5 MBps)

•      USB 2.0 480 Mbps (60 MBps)

–   WWW.belkin.com/usb2.pdf

•      USB hubs

•      PnP

•      Hot-Plugging

 

 

 

 

FireWire i.Link (IEEE 1394)

•      100, 200, 400 Mbit/sec (50MB/s)

•      * Future Specifications

–   800 Mbps (100MBps)

–    1.2 Gbps (150 MBps)

•      63 devices

•      PnP

•      Hot-Plugging

 

PC-CARD (PCMCIA)

•      Laptops and Notebooks

•      Credit card-size expansion boards

 

Bus Width Speed  Bandwidth

•       Bus Type          Width (bits) Speed (MHz)Bandwidth(MB/sec)   

•       8-bit ISA                    8          4.77                   2.39        

•       16-bit ISA                  16          8.33                   8.33        

•       EISA                           32          8.33                   33.3        

•       VLB                            32          33.33                 133

•       PCI                              32          33.33                 133         

•       PCI                             64          66.66                 533         

•       PCI-X                         64          133.33               1066

•       AGP                            32            66.66           266         

•       AGP-2X                     32          66.66                 533         

•       AGP-4X                     32          66.66                 1066       

•       AGP-8X                     32          66.66                 2133

•       USB 2.0                                480Mbps        60

•       IEEE-1394                            400Mbps        50