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From: Ned Buckmaster on 20 Jan 2006 18:32
I am installing a P5WD2-E Premium MB in an Antec Sonata II case. The MB
manual says to connect the 10-pin internal audio connector to either a
'legacy AC'97' or 'high-definition' front panel, and set the BIOS
accordingly.
The Antec manual says it has an 'Intel Standard' connector. Is that either
of the above? What makes a 'high-definition front panel audio module'? I
can't find this phrase anywhere but the Asus web site....

Thanks,

Ned



From: Anthony Horan on 21 Jan 2006 00:48
On Fri, 20 Jan 2006 17:32:53 -0600, Ned Buckmaster wrote:

> I am installing a P5WD2-E Premium MB in an Antec Sonata II case. The MB
> manual says to connect the 10-pin internal audio connector to either a
> 'legacy AC'97' or 'high-definition' front panel, and set the BIOS
> accordingly.
> The Antec manual says it has an 'Intel Standard' connector. Is that either
> of the above? What makes a 'high-definition front panel audio module'?

It would, I assume, have 5.1 or 7.1 connections. The Sonata II only has
stereo headphone output and mono mic input.

That said, even with the BIOS front-panel type set to "high definition", it
still works fine.

From: Paul on 21 Jan 2006 03:17
In article <useAf.501$FQ4.98(a)fe05.lga>, "Ned Buckmaster"
<Ned(a)Buckmaster.com> wrote:

> I am installing a P5WD2-E Premium MB in an Antec Sonata II case. The MB
> manual says to connect the 10-pin internal audio connector to either a
> 'legacy AC'97' or 'high-definition' front panel, and set the BIOS
> accordingly.
> The Antec manual says it has an 'Intel Standard' connector. Is that either
> of the above? What makes a 'high-definition front panel audio module'? I
> can't find this phrase anywhere but the Asus web site....
>
> Thanks,
>
> Ned

The legacy audio header definition can be found on page 19 and 20 here.

http://www.formfactors.org/developer/specs/fpio_design_guideline.pdf

Since that 59 page file is not likely to be on the site any more,
you can get an archived copy here:

http://web.archive.org/web/20040407073715/http://www.formfactors.org/developer/specs/fpio_design_guideline.pdf

MIC x x GND As found on motherboards previous
MIC_BIAS x x +5_Analog to HDAudio. +5_Analog is used to
FPOUT_R x x Return_R power a headphone amplifier in the
(HP_ON) x computer case. HP_ON was supposed to
FPOUT_L x x Return_L be a logic signal to control the amp.

A newer version of FPIO is here. Note that Intel not only invented
an HDaudio header pinout, they also redefined the legacy AC97 pinout!
I guess the purpose of redefining the AC97 header pinout, is so one
header can be used for both purposes on the motherboard ?

http://www.formfactors.org/developer\specs\A2928604-005.pdf

HDAudio header

"AC97 Mode" "HDAudio Mode"

MIC x x GND Port_1L x x GND
MIC_BIAS x x GND Port_1R x x Presence#
FPOUT_R x x Return_R Port_2R x x Sense1_Return
+5_Analog x Sense_Send x
FPOUT_L x x Return_L Port_2L x x Sense2_Return

1 x x 2 (Pin numbers for reference)
3 x x 4
5 x x 6
7 x
9 x x 10

Now, what I don't understand, is why the new header definition
has +5_Analog on pin 7. If somebody had implemented a headphone
amplifier using the old AC97 definition, with the new header
they get no power on the amplifier, and they get a power signal
where the logic control should be. On some chips, that might
cause destructive currents to flow. I haven't seen anyone
advertise a computer case with a headphone amp, so perhaps
this doesn't matter in the real world.

In any case, looking at the Antec Sonata II manual, their pin
names refer to the old header definition. The Antec wiring
should look like this.

http://www.antec.com/us/productDetails.php?ProdID=15139

MIC x x AUD_GND
MIC_BIAS x x
FPOUT_R x x Ret_R
x
FPOUT_L x x Ret_L

But as you can see in the Asus manual, the Antec wires "Ret_R"
and "Ret_L" do nothing in this case, and don't actually need
to be connected. So just five of them are enough, and the
motherboard should be set to AC97 mode.

HTH,
Paul
From: Ned Buckmaster on 22 Jan 2006 10:38
Thanks for the replies!


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