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The Peripheral Component Interconnect (shortened in NCV ) is a local standard of drunk (intern) making it possible to connect expander cards on the Mother chart of a Ordinateur.

One of the advantages of bus NCV is that two charts NCV can dialog between them without passing by the processor.

History

The specification of this bus is initially due to Intel which started to work there towards 1990.

Version 1.0 was published the June 22nd 1992. Version 2.0 was published the April 30th 1993 and was established for the first time in 1994 on mother charts for processor Intel 80486. From there, bus NCV replaced the others quickly drunk present, like the bus ISA.

Today, the evolution of the specifications of bus NCV, like those of bus AGP and PCI Express are managed by a lobby, Special NCV Interest Group (PCI-SIG), opened to the industrialists.

Bus NCV (as well as AGP) is currently replaced (for all the charts, to start with the graphics cards) by a smaller version and more rapid: the PCI Express.

Specification

The specification of bus NCV describes the size of the bus (of which the spacing of the drivers), characteristics electric, the chronograms of the bus and the protocols.

There exist several alternatives of this bus:

  • NCV 2.2 which exists in two versions:
    • drunk 32 bits with 33 MHz (either a maximum band-width of 133 Mo /s) (most widespread);
    • drunk 64 bits with 66 MHz (that is to say a maximum band-width of 528 Mo/s), used on certain professional mother charts or waiters (they twice make the length of the NCV 2.2 with bus 32 bits);
  • PCI-X : bus 64 bits with 133 MHz (that is to say a maximum band-width of 1066 Mo/s), used mainly in the professional machines;
  • PCI-X 2.0 : 266 MHz (either a maximum band-width of 2133 Mo/s);
  • PCI Express: normalizes derived from NCV , intended to replace it in the personal computers. As opposed to what one can believe and although intended to replace bus AGP (but also the NCV), PCI Express is absolutely not limited to the only connection of video chart;
  • Mini NCV: derived from the NCV 2.2 intended to be integrated in the laptops.

In its version purely NCV the band-width is divided between all the elements connected on the bus, contrary to what occurs for the PCI Express version where the band-width is dedicated for each peripheral. The latter is thus preferable if one wants simultaneously to use charts high banc (chart Gigabits networks, controller disc, graphics card,…).

Let us note that, as for the processors, certain mother charts allow overclocker a bus NCV 33 MHz, by increasing the frequency of the bus up to 37,5 MHz even 41.5 MHz. In spite of the variation to the standard of many charts NCV function still perfectly (and more quickly) at these frequencies.

Uses

It is generally used in the personal computers (PC or Mac in particular).

Here a nonexhaustive list of expander cards generally connected to this port:

  • Chart its
  • Graphics card, these charts now uses (August 2005) almost all drunk it AGP, which even is to him in the process of disappearance with the profit of the PCI Express
  • Carte network
  • etc

Certain internal components with the mother chart (the sound, the network, etc) are generally present and usable on bus NCV. It is the case for example controllers integrated into the Northbridge, with the Southbridge (the cases current most frequent: its, network…) or of the dedicated chips, welded directly onto a mother chart high-of-range (formerly for the integrated sound, today for controllers additional RAID, etc).

See too

External bonds

  • Official site of the PCI-SIG
  • bus NCV

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