alc658 Realtek Semiconductor Corporation, alc658 Datasheet - Page 15

• Manufacturer Part Number: alc658
• Description: Six-channel Ac?97 2.3 Audio Codec
• Manufacturer: Realtek Semiconductor Corporation

For NL/NR:
6.1.5.
Default: 8008H
Register 0EH controls the microphone input volume. Each step in bits 4:0 corresponds to a 1.5dB increase/decrease in volume,
allowing 32 levels of volume, from 00000 to 11111. Each step in bit 6 corresponds to a 20dB increase in volume.
6.1.6.
Default: 8808H
Register 10H controls the LINE_IN input volume. Each step in bits 4:0 corresponds to a 1.5dB increase/decrease in volume for
the right channel, allowing 32 levels of volume, from 00000 to 11111. Each step in bits 12:8 corresponds to a 1.5dB
increase/decrease in volume for the left channel, allowing 32 levels of volume, from 00000 to 11111.
6.1.7.
Default: 8808H
Register 12H controls the CD input volume. Each step in bits 4:0 corresponds to a 1.5dB increase/decrease in volume for the
right channel, allowing 32 levels of volume, from 00000 to 11111. Each step in bits 12:8 corresponds to a 1.5dB
increase/decrease in volume for the left channel, allowing 32 levels of volume, from 00000 to 11111.
Six-Channel AC’97 2.3 Audio Codec
For MV:
For CL/CR:
14:13
12:8
7:5
4:0
Bit
15
14:10
14:13
9:8
4:0
12:8
Bit
15
7:5
4:0
Bit
7
6
5
15
MX0E MIC Volume
MX10 LINE_IN Volume
Type
MX12 CD Volume
R/W
R/W
R/W
Type
R/W
R/W
R/W
R/W
-
-
Type
R/W
R/W
R/W
00h
08h
1Fh
-
-
-
-
-
00h
08h
1Fh
00h
08h
1Fh
Function
Mute Control 0: Normal
Reserved
Line-In Left Volume (NL[4:0]) in 1.5 dB steps
Reserved
Line-In Right Volume (NR[4:0]) in 1.5 dB steps
Function
Mute Control 0: Normal
Reserved
Boost Gain Option (BGO)
Reserved
20 dB Boost Control 0: Normal 1: 20 dB boost
Reserved
Mic Volume (MV[4:0]) in 1.5 dB steps
Function
00: 20 dB
Mute Control 0: Normal
Reserved
CD Left Volume (CL[4:0]) in 1.5dB steps
Reserved
CD Right Volume (CR[4:0]) in 1.5dB steps
+12 dB Gain
0 dB Gain
-34.5dB Gain
+12 dB Gain
0 dB attenuation
-34.5dB Gain
0 dB Gain
-34.5dB Gain
+12 dB Gain
01: 6 dB
Table 11. MX10 LINE_IN Volume
Table 10. MX0E MIC Volume
Table 12. MX12 CD Volume
10: 12 dB
1: Mute (-∞ dB)
1: Mute (-∞ dB)
1: Mute (-∞ dB)
11: 29.5 dB (V=30*Vmic-in)
11
Datasheet
ALC658
Rev. 1.3