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Front Panel Audio Header for Intel HD Audio Pin Signal Name Description 1 PORT_1L Analog Port 1 – left channel (microphone) 2 GND Ground 3 PORT_1R Analog Port 1 – right channel (microphone) 4 PRESENCE# Active low signal that signals BIOS that an Intel HD Audio dongle is connected to the analog header. PRESENCE#=0 when an Intel HD Audio dongle is connected 5 PORT_2R Analog Port 2 – right channel (headphone) 6 SENSE1_RETURN Jack detection return for front panel (JACK1) 7 SENSE_SEND Jack detection sense line from the Intel HD Audio CODEC jack detection resistor network 8 KEY No pin 9 PORT_2L Analog Port 2 – left channel (headphone) 10 SENSE2_RETURN Jack detection return for front panel (JACK2) Table 13. Front Panel Audio Header for AC ’97 Audio Pin Signal Name Description 1 MIC Front panel microphone input signal (biased when supporting stereo microphone) 2 AUD_GND Ground used by analog audio circuits 3 MIC_BIAS Microphone power/additional MIC input for stereo microphone support 4 PRESENCE# Active low signal that signals BIOS that an Intel HD Audio dongle is connected to the analog header. PRESENCE#=0 when an Intel HD Audio dongle is connected. 5 FP_OUT_R Right channel audio signal to front panel (headphone drive capable) 6 AUD_GND Ground used by analog audio circuits 7 RESERVED Reserved 8 KEY No pin 9 FP_OUT_L Left channel audio signal to front panel (headphone drive capable) 10 AUD_GND Ground used by analog audio circuits Technical Reference Table 14. IEEE 1394a Header Pin Signal Name Pin Signal Name 1 Data A (positive) 2 Data A (negative) 3 Ground 4 Ground 5 Data B (positive) 6 Data B (negative) 7 +12 V DC 8 +12 V DC 9 Key (no pin) 10 Ground Table 15. SATA Connectors Pin Signal Name 1 Ground 2 TXP 3 TXN 4 Ground 5 RXN 6 RXP 7 Ground Table 16. S/PDIF Header Pin Signal Name 1 Ground 2 S/PDIF out 3 Key (no pin) 4 +5 VDC Table 17. USB 2.0 Headers Pin Signal Name 1 +5 V DC 2 D. 3 D+ 4 Ground 5 Key (no pin) Intel Desktop Board DX79SI Technical Product Specification Table 18. USB 3.0 Connector Pin Signal Name Description 1 Vbus Power 2 IntA_P1_SSRX. USB3 ICC Port1 SuperSpeed Rx. 3 IntA_P1_SSRX+ USB3 ICC Port1 SuperSpeed Rx+ 4 GND Ground 5 IntA_P1_SSTX. USB3 ICC Port1 SuperSpeed Tx. 6 IntA_P1_SSTX+ USB3 ICC Port1 SuperSpeed Tx+ 7 GND Ground 8 IntA_P1_D. USB3 ICC Port1 D. (USB2 Signal D.) 9 IntA_P1_D+ USB3 ICC Port1 D+ (USB2 Signal D+) 10 ID Over Current Protection 11 IntA_P2_D+ USB3 ICC Port2 D+ (USB2 Signal D+) 12 IntA_P2_D. 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 Table 19. Chassis Intrusion Header Pin Signal Name 1 Intruder# 2 Ground Table 20. 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. Technical Reference 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 2.2.2.2 Add-in Card Connectors The board has the following add-in card connectors: • PCI Express 3.0 x16: three PCI Express 3.0 x16 connectors supporting simultaneous transfer speeds up to 16 GB/s of peak bandwidth per direction and up to 32 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 500 MB/s of peak bandwidth per direction and up to 1.0 GB/s concurrent bandwidth. • Conventional PCI (rev 2.3 compliant) bus: one Conventional PCI bus add-in card connector. 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. Intel Desktop Board DX79SI Technical Product Specification 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 re...