alc658 Realtek Semiconductor Corporation, alc658 Datasheet - Page 17

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

6.1.10. MX1A Record Select
Default: 0000H
Register 1AH controls the record input source. Each step in bits 2:0 selects a recording source for the right channel. Each step
in bits 10:8 selects a recording source for the left channel.
6.1.11. MX1C Record Gain for 1
Default: 8000H
Register 1CH controls the record gain. Each step in bits 3:0 corresponds to a 1.5dB increase/decrease in gain for the right
channel, allowing 16 levels of gain, from 0000 to 1111. Each step in bits 11:8 corresponds to a 1.5dB increase/decrease in gain
for the left channel, allowing 16 levels of gain, from 0000 to 1111.
Six-Channel AC’97 2.3 Audio Codec
For LRS:
For RRS:
For LRG/RRG:
15:11
10:8
14:12
7:3
2:0
11:8
Bit
7:4
3:0
Bit
15
Type
R/W
R/W
Type
R/W
R/W
R/W
-
-
-
-
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
0Fh
00h
Function
Reserved
Left Record Source Select (LRS[2:0])
Reserved
Right Record Source Select (RRS[2:0])
Function
Mute Control 0: Normal 1: Mute (-∞ dB)
Reserved
Left Record Gain Select (LRG[3:0]) in 1.5 dB steps
Reserved
Right Record Gain Select (RRG[3:0]) in 1.5 dB steps
MIC
CD LEFT
Muted
AUX LEFT
LINE LEFT
STEREO MIXER OUTPUT LEFT
MONO MIXER OUTPUT
PHONE
MIC
CD RIGHT
Muted
AUX RIGHT
LINE RIGHT
STEREO MIXER OUTPUT RIGHT
MONO MIXER OUTPUT
PHONE
+22.5 dB Gain
0 dB (No Gain)
Table 16. MX1C Record Gain for 1st Stereo ADC
Table 15. MX1A Record Select
st
Stereo ADC
13
Datasheet
ALC658
Rev. 1.3