ALS300 Datasheet, PDF (12/66 Pages) List of Unclassifed Manufacturers – Media Audio Controller SPEC

Avance Logic Inc.
ALS300
Bit 3
MX37.7
Bit 2
MX37.6
Bit 1
MX37.5
Bit 0
MX37.4
Bit 7..4
Bit 3..0
reserved
0 to 15, CD-audio volume left and right in 3 dB step
0
-45 dB (off)
15
0 dB (maximum volume)
MX0A
microphone volume
Ghost register
Write
Bit 7..3
Bit 2
Bit 1
Bit 0
X
MX3A.7
MX3A.6
MX3A.5
Bit 2
MX3A.4
Bit 1
MX3A.3
Read
Bit 7..3
Bit 2
Bit 1
Bit 0
X
MX3A.7
MX3A.6
MX3A.5
Bit 7..3
Bit 2..0
reserved
0 to 7, microphone volume in 6 dB step
0
-42 dB (off)
7
0 dB (maximum volume)
MX0C
digital audio input control
Default 00h
Dummy read/write register
Bit 7,6
Bit 5
Bit 4
Bit 3
Bit 2,1
Bit 0
reserved
input filter enable
reserved
input filter high/low
input source
reserved
Input filter enable and input filter high/low are dummy read/write bits for Sound Blaster Pro
compatibility.
Input filter enable: 0 - input low-pass filter on, 1 - off
Input filter high/low: 0 - low filter (3.2 KHz low pass), 1 - high filter (8.8 KHz low pass)
Input source
Bit 2 Bit 1
0
0
0
1
1
0
microphone (MX3D & MX3E = 1)
CD-audio (MX3D = 04h, MX3E = 02h)
microphone (MX3D & MX3E = 1)
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