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USB3 ICC Port2 D. (USB2 Signal D.) 13 GND Ground 14 IntA_P2_SSTX+ USB3 ICC Port2 SuperSpeed Tx+ 15 IntA_P2_SSTX. USB3 ICC Port2 SuperSpeed Tx. 16 GND Ground 17 IntA_P2_SSRX+ USB3 ICC Port2 SuperSpeed Rx+ 18 IntA_P2_SSRX. USB3 ICC Port2 SuperSpeed Rx+ 19 Vbus Power 20 Key No pin Technical Reference Table 22. Chassis Intrusion Header Pin Signal Name 1 Ground 2 Intruder# Table 23. Processor, Front and Rear Chassis, and Auxiliary (4-Pin) Fan Headers Pin Signal Name 1 Ground (Note) 2 +12 V 3 FAN_TACH 4 FAN_CONTROL Note: These fan headers use Pulse Width Modulation control for fan speed. Table 20. Back Panel CIR Emitter (Output) Header Pin Signal Name 1 Emitter out 1 2 Emitter out 2 3 Ground 4 Key (no pin) 5 Jack detect 1 6 Jack detect 2 Table 21. Front Panel CIR Receiver (Input) Header Pin Signal Name 1 Ground 2 LED 3 NC 4 Learn-in 5 5 V standby 6 VCC 7 Key (no pin) 8 CIR Input Intel Desktop Board DZ68BC Technical Product Specification Table 24. Serial Port Header Pin Signal Name Pin Signal Name 1 DCD (Data Carrier Detect) 2 RXD# (Receive Data) 3 TXD# (Transmit Data) 4 DTR (Data Terminal Ready) 5 Ground 6 DSR (Data Set Ready) 7 RTS (Request to Send) 8 CTS (Clear to Send) 9 RI (Ring Indicator) 10 Not connected Table 21. Alternate Power LED Pin Signal Name 1 MAIN_COLOR_LED 2 KEY (no pin 3 ALT_COLOR_LED 2.2.2.2 Add-in Card Connectors The board has the following add-in card connectors: • PCI Express 2.0 x16: two PCI Express 2.0 x16 connectors supporting simultaneous transfer speeds up to 8 GB/s of peak bandwidth per direction and up to 16 GB/s concurrent bandwidth. • PCI Express 2.0 x1: two PCI Express 2.0 x1 connectors. The x1 interface supports simultaneous transfer speeds up to 1 GB/s of peak bandwidth per direction and up to 2 GB/s concurrent bandwidth. • Conventional PCI (rev 2.3 compliant) bus: three Conventional PCI bus add-in card connectors. Note the following considerations for the Conventional PCI bus connector: • The Conventional PCI bus connectors are bus master capable. • SMBus signals are routed to the Conventional PCI bus connectors. This enables Conventional PCI bus add-in boards with SMBus support to access sensor data on the desktop board. The specific SMBus signals are as follows: . The SMBus clock line is connected to pin A40. . The SMBus data line is connected to pin A41. Technical Reference 2.2.2.3 Power Supply Connectors The board has the following power supply connectors: • Main power – a 2 x 12 connector. This connector is compatible with 2 x 10 connectors previously used on Intel Desktop boards. The board supports the use of ATX12V power supplies with either 2 x 10 or 2 x 12 main power cables. When using a power supply with a 2 x 10 main power cable, attach that cable on the leftmost pins of the main power connector, leaving pins 11, 12, 23, and 24 unconnected. • Processor core power – a 2 x 4 connector. This connector provides power directly to the processor voltage regulator and must always be used. Failure to do so will prevent the board from booting. Table 25. Processor Core Power Connector Pin Signal Name Pin Signal Name 1 Ground 2 +12 V 3 Ground 4 +12 V 5 Ground 6 +12 V 7 Ground 8 +12 V Table 26. Main Power Connector Pin Signal Name Pin Signal Name 1 +3.3 V 13 +3.3 V 2 +3.3 V 14 -12 V 3 Ground 15 Ground 4 +5 V 16 PS-ON# (power supply remote on/off) 5 Ground 17 Ground 6 +5 V 18 Ground 7 Ground 19 Ground 8 PWRGD (Power Good) 20 No connect 9 +5 V (Standby) 21 +5 V 10 +12 V 22 +5 V 11 +12 V (Note) 23 +5 V (Note) 12 2 x 12 connector detect (Note) 24 Ground (Note) Note: When using a 2 x 10 power supply cable, this pin will be unconnected. For information about Refer to Power supply considerations Section 2.5.1 on page 64 Intel Desktop Board DZ68BC Technical Product Specification 2.2.2.4 Front Panel Header This section describes the functions of the front panel header. Table 27 lists the signal names of the front panel header. Figure 13 is a connection diagram for the front panel header. Table 27. Front Panel Header Pin Signal In/ Out Description Pin Signal In/ Out Description Hard Drive Activity LED Power LED 1 HD_PWR Out Hard disk LED pull-up to +5 V 2 HDR_BLNK_GRN Out Front panel green LED 3 HDA# Out Hard disk active LED 4 HDR_BLNK_YEL Out Front panel yellow LED Reset Switch On/Off Switch 5 Ground Ground 6 FPBUT_IN In Power switch 7 FP_RESET# In Reset switch 8 Ground Ground Power Not Connected 9 +5 V Power 10 N/C Not connected Figure 13. Connection Diagram for Front Panel Header 2.2.2.4.1 Hard Drive Activity LED Header Pins 1 and 3 can be connected to an LED to provide a visual indicator that data is being read from or written to a hard drive. Proper LED function requires a SATA hard drive or optical drive connected to an onboard SATA connector. Technical Reference 2.2.2.4.2 Reset Switch Header Pins 5 and 7 can be connected to a momentary single pole, single throw (SPST) type switch that is normally open. When the switch is closed, the board resets and runs the POST. 2.2.2.4.3 Power/Slee...