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<table class="head">
<tr>
<td class="head-ltitle">AC97(4)</td>
<td class="head-vol">Device Drivers Manual</td>
<td class="head-rtitle">AC97(4)</td>
</tr>
</table>
<div class="manual-text">
<section class="Sh">
<h1 class="Sh" id="NAME"><a class="permalink" href="#NAME">NAME</a></h1>
<p class="Pp"><code class="Nm">ac97</code> — <span class="Nd">generic
AC97 codec driver</span></p>
</section>
<section class="Sh">
<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
<p class="Pp">AC97 codecs contain the analog-to-digital (A/D), digital-to-analog
(D/A), and mixing circuitry of many modern sound cards. AC97 codecs, for the
most part, do not talk to host busses like the PCI bus directly. Instead,
they communicate through an interface chip, called the host controller. The
Ensoniq AudioPCI 97 (see <a class="Xr">eap(4)</a>) is an example of such a
host controller.</p>
<p class="Pp">Unlike many drivers, the <code class="Nm">ac97</code> driver does
not appear in the configuration file. Instead, the driver is automatically
attached by the drivers that require it.</p>
</section>
<section class="Sh">
<h1 class="Sh" id="SEE_ALSO"><a class="permalink" href="#SEE_ALSO">SEE
ALSO</a></h1>
<p class="Pp"><a class="Xr">auacer(4)</a>, <a class="Xr">auich(4)</a>,
<a class="Xr">auixp(4)</a>, <a class="Xr">autri(4)</a>,
<a class="Xr">auvia(4)</a>, <a class="Xr">clcs(4)</a>,
<a class="Xr">clct(4)</a>, <a class="Xr">eap(4)</a>,
<a class="Xr">emuxki(4)</a>, <a class="Xr">esa(4)</a>,
<a class="Xr">esm(4)</a>, <a class="Xr">fms(4)</a>,
<a class="Xr">neo(4)</a>, <a class="Xr">yds(4)</a></p>
</section>
<section class="Sh">
<h1 class="Sh" id="BUGS"><a class="permalink" href="#BUGS">BUGS</a></h1>
<p class="Pp">The <code class="Nm">ac97</code> driver does not keep track of the
current user settings and instead relies on the hardware to do this.</p>
<p class="Pp">The <code class="Nm">ac97</code> driver could do more to detect
mixer channels that don't work and cull them from the list.</p>
</section>
</div>
<table class="foot">
<tr>
<td class="foot-date">October 7, 1999</td>
<td class="foot-os">NetBSD 10.1</td>
</tr>
</table>
|
