alc658 Realtek Semiconductor Corporation, alc658 Datasheet - Page 16

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

6.1.8.
Default: 8808H
Register 16H controls the auxiliary 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.
6.1.9.
Default: 8808H
Register 18H controls the PCM_OUT output volume of front DAC. 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 AL/AR:
For PL/PR:
14:13
14:13
12:8
12:8
Bit
7:5
4:0
7:5
4:0
Bit
15
15
MX16 AUX Volume
MX18 PCM_OUT Volume
Type
Type
R/W
R/W
R/W
R/W
R/W
R/W
-
-
-
-
00h
08h
1Fh
00h
08h
1Fh
Function
Function
Mute Control 0: Normal
Reserved
PCM Left Volume (PL[4:0]) in 1.5 dB steps
Reserved
PCM Right Volume (PR[4:0]) in 1.5 dB steps
Mute Control 0: Normal
Reserved
AUX Left Volume (AL[4:0]) in 1.5 dB steps
Reserved
AUX Right Volume (AR[4:0]) in 1.5 dB steps
+12 dB Gain
0 dB Gain
-34.5dB Gain
+12 dB Gain
0 dB Gain
-34.5dB Gain
Table 14. MX18 PCM_OUT Volume
Table 13. MX16 AUX Volume
1: Mute (-∞ dB)
1: Mute (-∞ dB)
12
Datasheet
ALC658
Rev. 1.3