Intel DX79SI - Front Panel Audio Header for Intel HD Audio; Front Panel Audio Header for AC 97 Audio

Intel Desktop Board DX79SI Technical Product Specification
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2.2.2.1 Signal Tables for the Connectors and Headers
Table 13. 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 14. 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