Gigabyte GA-990FXA-UD3 R5 Manual - Page 27
F_USB1/F_USB2/F_USB3 USB 2.0/1.1 Headers, F_USB30 USB 3.0/2.0 Header
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Page 27 highlights
10) F_USB1/F_USB2/F_USB3 (USB 2.0/1.1 Headers) The headers conform to USB 2.0/1.1 specification. Each USB header can provide two USB ports via an UG T optional USB bracket. For purchasing the optional USB bracket, please contact the local dealer. Pin No. Definition 1 Power (5V) 9 1 2 Power (5V) 10 2 3 USB DX- 4 USB DY- 5 USB DX+ 6 USB DY+ 7 GND 8 GND 9 No Pin 10 NC 11) F_USB30 (USB 3.0/2.0 Header) The header conforms to USB 3.0/2.0 specification and can provide two USB ports. For purchasing the optional 3.5" front panel that provides two USB 3.0/2.0 ports, please contact the local dealer. 1 F_USB30 10 F_ U 20 11 Pin No. Definition Pin No. Definition 1 VBUS 11 D2+ 2 SSRX1- 12 D2- 3 SSRX1+ 13 GND 4 GND 14 SSTX2+ 5 SSTX1- 15 SSTX2- 6 SSTX1+ 16 GND 7 GND 17 SSRX2+ B_ BS 8 D1- 18 SSRX2- 9 D1+ 19 VBUS 10 NC 20 No Pin S •• Do not plug the IEEE 1394 bracket (2x5-pin) cable into the USB header. •• Prior to installing the USB bracket, be sure to turn off your computer and unplug the power cord from the power outlet to prevent damage to the USB bracket. S - 27 - Hardware Installation