Specifications

Computer Architecture and Maintenance (G-Scheme-2014)

a new video card and you are unsure about the slots, stick with the PCI version of this

card it will always work.

The most recent motherboards usually provide four or five PCI slots. The chipset

provides bridging functions between these 10 buses (The PCI ISA bridge) and between

10 buses and other system buses, including the memory bus. Any system or

motherboard today should provide PCI expansion slots in adequate number for s stem

needs.

PCI is an evolving standard. Recent models used PCI 2,1 allowing

upgradeability. Today’s motherboards use PCI 2.2 and PCI 2.3 is already defined and

implementations are on their way.

Speed and Width of PCI

 PCI expansion buses differ in two respects that determine their performance: PCI

bus width and bus speed.

 PCI with 32 bits width at 33.33 MHz generating 133.33 Mbytes/s is found in

Desktops and Entry -level servers,

 PCI with 64 bits width at 66.66 MHz generating 53333 Mbytes/s is more

commonly found in Mid-range to High-end Servers.

Feature of PCI

 Extremely high-speed data transfer: 32-bit wide data transfer at the rate 33 MI-h

gives a maximum throughput of 132 Mega bytes per second. Data transfer at the

rate 66 MHz with 64 bit wide data is now being offered.

 Plug and play facility: This circumvents the need for an explicit address’ for a

plug in board. A PCI board inserted in any PCI slot is automatically detected and

the required 110 and memory resources are allotted by the system. Thus, there is

no risk of clash of resources.

 New approach: It moves peripherals off the 1/0 bus and places them closer to the

system processor bus, thereby providing faster data transfer between the

processor and peripherals.

 Processor independence: The PCI local bus fulfills the need for a local bus

standard that is not directly dependent on the speed and structure of the

processor bus, and that is both reliable and expandable. It is for the first time in

PC industry that a common bus, independent of microprocessor and

manufacturer, has been adopted.

 Full multi-master capability :This allows any PCI master to communicate

directly with other PC master/slave.

Prepared By – Prof. Manoj.kavedia (9860174297 – 9324258878 ) (www.kavediasir.yolasite.com)