Ac'97 Audio Interface - Xilinx ML410 User Manual

R
ML410 Embedded Development Platform
UG085 (v1.7.2) December 11, 2008
Downloaded from Elcodis.com electronic components distributor

AC'97 Audio Interface

The ALi South Bridge Super I/O controller has a built-in audio interface that is combined
with a standard audio codec (AC'97), LM4550. Available features include:
♦
AC'97 Codec 2.1 Specification compliant
♦
Codec variable sample rate support
♦
32-voice hardware wave-table synthesis
♦
32 independent DMA channels
♦
3D positioning sound acceleration
♦
Legacy Sound Blaster compatible
♦
FM OPL3 emulation
♦
MIDI interpretation
♦
MIDI MPU-401 interface
ML410 platforms employ a National Semiconductor LM4550 audio codec (U1) combined
with the ALi South Bridge AC'97 interface. This interface can be used to play and record
audio. The LM4550 has left and right channel line inputs, left and right CD-ROM inputs, a
microphone input, left and right channel line outputs, and an amplified headphone output
suitable for driving an 8Ω load using the LM4880 (U2). The microphone input and
right/left amplified outputs are easily accessible via two 2.5mm audio jacks on the J1
connector. The Line In and Line Out connections are accessible via two Berg headers (J2
and J31).
Table 2-32 describes the audio jacks available to the user on ML410 platforms.
Table 2-32: Audio Jacks (J1, J2, and J31)
Audio Jack
AC_AMP_OUTR
J1 Top
AC_AMP_OUTL
J1 Bottom AC_MIC_IN
AC_LINE_OUTR
J31
AC_LINE_OUTL
AC_LINE_INR
J2
AC_LINE_INL
AC_CD_INR
J6
AC_CD_INL
Signal Name
AC Amplified Output, right and left channels,
driven by U2, LM4880
Microphone Input to U1, LM4550
AC Line Output, right and left channels,
driven by U1, LM4550
AC Line Input, right and left channels,
driven by U1, LM4550
AC CD Input, right and left channels,
driven by U1, LM4550
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