Introduction to PCI Express-a new high speed serial data bus

Most new PCs have a new bus called PCI Express. It is a very high speed dual-simplex, point to point serial differential low voltage interconnect. The signaling rate is 2.5 Gbit per second, with 8/10 bit encoding to embed the clock in the data stream. On the transmit side parallel data is shifted out serially and on the receive side serial data is shifted into registers for parallel data output. The receiver also recovers the embedded clock. This new bus can be used to connect modules or boxes via twisted pair copper and is the bus of choice for high speed applications in the industrial world