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Single-Chip Dual-Channel AC’97 Audio Codec
EMP202
EMPIA Technology
7/15/2002
13
5.1.13. MX1A Record Select
Default: 0000H
Each step in bits 2:0 correspond to 1.5dB in increase/decrease in volume for the right channel,
allowing 7 levels of volume, from 000 to 111. Each step in bits 10:8 correspond to 1.5dB in
increase/decrease in volume for the left channel, allowing 7 levels of volume, from 000 to 111.
Bit
Type
Function
15:11
-
Reserved
10:8
R/W
Left Record Source Select: (LRS[2:0])
7:3
-
Reserved
2:0
R/W
Right Record Source Select: (RRS[2:0])
1) For LRS:
0 MIC
1 CD LEFT
2 VIDEO LEFT
3 AUX LEFT
4 LINE LEFT
5 STEREO MIXER OUTPUT LEFT
6 MONO MIXER OUTPUT
7 PHONE
2) For RRS:
0 MIC
1 CD RIGHT
2 VIDEO RIGHT
3 AUX RIGHT
4 LINE RIGHT
5 STEREO MIXER OUTPUT RIGHT
6 MONO MIXER OUTPUT
7 PHONE
5.1.14. MX1C Record Gain
Default: 8000H
Each step in bits 3:0 correspond to 1.5dB in increase/decrease in gain for the right channel, allowing
16 levels of gain, from 0000 to 1111. Each step in bits 11:8 correspond to 1.5dB in increase/decrease
in gain for the left channel, allowing 16 levels of gain, from 0000 to 1111.
Bit
Type
Function
15
R/W
Mute Control:
0: Normal
1: Mute (- ‡dB)
14:12
-
Reserved
11:8
R/W
Left Record Gain Select: (LRG[3:0]) in 1.5 dB steps
7:4
-
Reserved
3:0
R/W
Right Record Gain Select: (RRG[3:0]) in 1.5 dB steps
1) For LRG/RRG:
0Fh
+22.5dB
00h
0 dB (No Gain)
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