Acer Aspire X3990 Acer Aspire X3990 Desktop Service Guide - Page 89

SATA1: Serial ATA connectors These connectors are used to support the Serial ATA 3Gb/s devices, simpler disk drivecabling and easier PC assembly. It eliminates limitations of the current Parallel ATAinterface. But maintains register compatibility and sofeware compatibility with PrallelATA. Pin Signal Name 1 Ground 3 TX- 5 RX- 7 Ground Pin Signal Name 2 TX+ 4 Ground 6 RX+ F_USB2~3: Front Panel USB headers The motherboard has four USB 2.0 headers supporting four USB 2.0 ports. Addition-ally, some computer cases have USB ports at the front of the case. If you have thiskind of case, use auxiliary USB connector to connect the front-mounted ports to themotherboard. Pin Signal Name 1 USBPWR 2 USBPWR 3 DATA0- 4 DATA1- 5 DATA0+ 6 DATA1+ 7 GND 8 GND 9 NC 10 USB DET Function Front Panel USB Power Front Panel USB Power USB Port 0 Negative Signal USB Port 1 Negative Signal USB Port 0 Positive Signal USB Port 1 Positive Signa Ground Ground Not connected USB DET NOTE: Please make sure that the USB cable has the same pin assignment asindicated above. A different pin assignment may cause damage or systemhang-up. SPDIFO: SPDIF out header This is an optional header that provides an SPDIFO (Sony/Philips Digital Interface)output to digital multimedia device through optical fiber or coaxial connector. Pin Signal Name 1 VCC 2 KEY 3 SPDIFOUT 4 GND 81 Chapter 5