6.2.1 PCI Express
(Ask a Question)PCIe is a point-to-point serial differential low-voltage interconnect supporting up to four channels. Each lane consists of two pairs of differential signals: a transmit pair, XCVR_x_TXy_P/N, and a receive pair, XCVR_x_RXy_P/N. Each signal has a 2.5 GHz embedded clock.
The following figure shows the connectivity between the transceiver interface and the PCIe edge connector.
Note: The ceramic 0201 and 0402 AC coupled capacitors are preferred for transceivers. The transmitter must have AC coupling capacitors.