The DB4-EAGLE is a XMC standard single-width mezzanine card, equipped with a PCI Express® to USB 3.0 quad-port controller. Three USB 3.0 receptacles are available from the front bezel for attachment of external USB 2.0 and USB 3.0 compliant devices. As an option, an additional USB 3.0 connector can be populated on-board, for system-internal usage.
The USB controller supports all USB data transfer protocols on any connector, SuperSpeed (USB 3.0 xHCI) as well as highspeed, full-speed, and low-speed. Since the DB4-EAGLE requires only a single PCI Express lane (Gen2 for optimum performance), the module can be combined with any XMC carrier card.
The DB4-EAGLE is equipped with the TI TUSB7340 single chip PCI Express® to USB 3.0 bridge. The xHCI (SuperSpeed) compliant host controller supports up to four downstream ports. Each downstream port may be independently enabled and has individual power control and overcurrent detection. SuperSpeed USB 3.0 offers ten times the data speed of USB 2.0 (5 Gbit/s compared to 480 Mbit/s).
The bandwidth of the xHCI controller is shared over all DB4-EAGLE downstream ports. The XMC VPWR voltage level is automatically detected and converted to the USB VBUS (+5V), across electronic power switches, which deliver > 1.5A to each connector, thus suitable even for heavy capacitive loads presented by external devices. |
