The TUSB7320EVM board is a free-standing reference design for a two-port PCIe-based SuperSpeed USB (USB 3.0) Extensible Host Controller (xHCI). It is used to evaluate system compatibility. A Microsoft WHQL certified xHCI compliant driver stack is provided as well. The TUSB7320 is fully backwards compatible to USB 2.0 supporting USB peripherals and hubs that support all data transfer speeds: USB 2.0 Low-speed (1.5Mbps), USB 2.0 Full-speed (12 Mbps), USB 2.0 High-speed (480 Mbps) as well as SuperSpeed USB (5 Gbps). A SuperSpeed peripheral is required to evaluate SuperSpeed data transfer.