Different Xilinx device families have Integrated Endpoint Block for PCI Express designs (integrated Endpoint block). For detailed PCIe information, refer to the applicable PCIe User Guide and enter in XPE the settings which correspond to your application.
Note: The XPE spreadsheets of 7 series and later devices do not have a PCI Express sheet. For these devices, PCIe information is specified on the Multi-Gigabit Transceiver sheets. See Using the Transceiver Sheets (GTP, GTX, GTH, GTY, GTZ).
Figure 1. PCIE Power Sheet (Virtex-6 Devices)