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Non-standard pinouts on front panel audio HDA-port

Last response: in Motherboards
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December 30, 2009 8:56:58 PM

Hi,

I've noticed that several of Gigabyte motherboards, among others the GA-P55A-UD4 and GA-P55-UD6, have pinout mismatches compared to Intel's guidelines for HDA.

According to the manual of the GA-P55A-UD4, the board's HDA pinouts are:

1 MIC2_L
2 GND
3 MIC2_R
4 -ACZ_DET
5 LINE2_R
6 GND
7 FAUDIO_JD
8 No Pin
9 LINE2_L
10 GND

But according to Intel's reference design, it should be:

1 PORT 1L
2 GND
3 PORT 1R
4 PRESENCE#
5 PORT 2R
6 SENSE1_RETURN
7 SENSE_SEND
8 KEY Connector Key
9 PORT 2L
10 SENSE2_RETURN

For some reason pin 6 and 10 are grounded by Gigabyte, when the mentioned pin's should in fact be representing jack detection return for port 1 (mic) and 2 (headphones).

Can anyone give some input on why this is?

Thanks in advance!
a c 177 V Motherboard
December 30, 2009 10:12:07 PM

The 'senses' are low true - they're pulled up and floating 'till grounded through the connector to 'detect'...
December 30, 2009 10:49:23 PM

OK, so one can connect a Intel-compliant HDA-plug to the HDA-port of the mentioned Gigabyte boards without any need for modification/rewireing?

The reason I'm asking is the somewhat frightening warning in the motherboard's manual regarding incorrect HDA- and AC97-connections.

Thanks!
a c 177 V Motherboard
December 30, 2009 10:55:05 PM

Yeah, it'll work; only caveat I know of is that, if your case came with a dual plug setup (HDA and '97), don't cut off the one you don't intend to use - the detects are often jumpered through both plugs (...at least on Antecs and CoolerMasters, that I know of...), and need rewiring if you want to 'lose one' for general tidiness...
!