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Installing and Replacing Desktop Board Components
39
Front Panel Audio Header
The front panel audio header shown in Figure 18, A on page 38 supports both Intel HD
Audio and AC’97 Audio. Table 5 shows the pin assignments and
signal names for Intel
HD Audio and Table 6 shows the pin assignments and
signal names for AC’97 Audio.
Table 5. Front Panel Audio Signal Names for Intel HD Audio
Pin Signal Name Pin Signal Name
1 PORT 1L (Microphone) 2 GND
3 PORT 1R (Microphone) 4 PRESENCE#
5 PORT 2R (Headphone) 6 SENSE1_RETURN
7 SENSE_SEND 8 KEY (no pin)
9 PORT 2L (Headphone) 10 SENSE2_RETURN
Table 6. Front Panel Audio Header Signal Names for AC’97 Audio
Pin Signal Name Pin Signal Name
1 MIC 2 AUD_GND
3 MIC_BIAS 4 AUD_GND
5 FP_OUT_R 6 FP_RETURN_R
7 AUD_5V 8 KEY (no pin)
9 FP_OUT_L 10 FP_RETURN_L
Chassis Intrusion Header
Figure 18, B on page 38 shows the location of the chassis intrusion header. This
header can be connected to a mechanical switch on the chassis to detect if the chassis
cover is removed.
Table 7 shows the pin assignments for t
he chassis intrusion header.
Table 7. Chassis Intrusion Header Signal Names
Pin Description
1 Intruder
2 Ground