Meinberg TCR170PEX Instrukcja Użytkownika Pobierz pdf (Strona 9)

PCI Express (PCIe)

The main technical inovation of PCI Express is a serial data transmission compared

to the parallel interfaces of other computer bus systems like ISA, PCI and PCI-X.

PCI Express defines a serial point-to-point connection, the so-called Link:

The data transfer within a Link is done via Lanes, representing one wire pair for

sending and one wire pair for receiving data:

This design leads to a full duplex connection clocked with 2.5 GHz capable of

transfering a data volume of 250 MB/s per lane in each direction. Higher bandwith is

implemented by using multiple lanes silmutaneously. A PCI Express x16 slot for

example uses sixteen lanes providing a data volume of 4 GB/s. For comparison: when

using conventional PCI the maximum data transfer rate is 133 MB/s, PCI-X allows 1

GB/s but only in one direction respectively. A PCIe expansion board (x1 like

TCR170PEX for example) can always be used in slots with a higher lane width

(x4, x8, x16):

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One of the strong points of PCI Express is the 100% software compatibility to the

well known PCI bus, leading to a fast spreading. The computer and the operating

system are „seeing“ the more powerfull PCIe bus just as the convetional PCI bus

without any software update.

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Meinberg TCR170PEX Instrukcja Użytkownika Strona 9

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