PCI Express

This blog provides information/ideas about PCI Express Bus Protocol.

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Tuesday, February 5, 2008

PCI-Express


PCI Express X1 Link Model
The major difference between PCI Express and PCI, PCI-Express is a Serial Point to Point interface, whereas PCI is a Parallel. A PCI-Express device is always the driver for its transmitter pairs(s) and is always the target for its receiver pair(s).The Connection between two PCI Express devices is referred to as Link. A links consist of number of Lanes. A lane is a combination of Transmit and Receive pairs. For the first generation of

PCI Express technology, there is only one signaling rate defined, which provides an effective 2.5 Gigabits/second/Lane/direction of raw bandwidth. The data rate is expected to increase with technology advances in the future.

PCI Express configuration has serial links: X1, X2, X4, X8, X12, X16 and X32. An X1 configuration has a single serial path of Transmit and Receive. Likewise X2 configurations have two serial paths of Transmit and Receive. The serial links pronounced as or read as ” by one “- X1 and “by two”-X2 and so on.


Model of X2 serial links


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