ALS300 Datasheet, PDF (13/66 Pages) List of Unclassifed Manufacturers – Media Audio Controller SPEC

Avance Logic Inc.
ALS300
1
1
external line-in (MX3D = 10h, MX3E = 08h)
Write to input source will update MX3D and MX3E input mixer left/right control register and 2 dummy
bits. Read from input source register will return 2 dummy bits.
MX0E
Default 00h
digital audio output control
Bit 7,6
Bit 5
Bit 4..2
Bit 1
Bit 0
reserved
output filter enable
reserved
stereo switch
reserved
Output filter enable is dummy read/write bit for Sound Blaster Pro compatibility.
Output filter enable: 0 - output low-pass filter on, 1 - off
Stereo switch: 1 - stereo output, 0 - mono output
Stereo switch is not used in ESP command BXh and CXh.
MX22
master left/right volume
Ghost register
Write
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
MX30.7
MX30.6
MX30.5
MX30.4
MX31.7
MX31.6
MX31.5
MX31.4
Bit 7
MX30.3
Bit 3
MX31.3
Read
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
MX30.7
MX30.6
MX30.5
MX30.4
MX31.7
MX31.6
MX31.5
MX31.4
Bit 7..4
Bit 3..0
0 to 15, master left volume in 3 dB step
0 to 15, master right volume in 3 dB step
0
-45 dB (off)
15
0 dB (maximum volume)
MX24
digital audio left/right volume
Same as MX04
MX26
music left/right volume
13