ADSP-1981BL_15 Datasheet, PDF (19/32 Pages) Analog Devices – AC 97 SoundMAX Codec

AD1981BL
RECORD SELECT CONTROL REGISTER
Index 0x1A
Reg No.
0x1A
Name
Record Select
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Default
X
X
X
X
X
LS2 LS1 LS0 X X X X X RS2 RS1 RS0 0x0000
Used to select the record source independently for right and left. The default value is 0x0000, which corresponds to MIC In. Refer to Table 24 for examples.
All registers are not shown, and bits containing an X are assumed to be reserved.
Table 23.
Bit
RS [2:0]
LS [2:0]
Function
Right Record Select
Left Record Select
Table 24. Settings for Record Select Control
LS [10:8]
Left Record Source
000
MIC
001
CD_L
010
Muted
011
AUX_L
100
LINE_IN_L
101
Stereo Mix (L)
110
Mono Mix
111
PHONE_IN
RS [2:0]
000
001
010
011
100
101
110
111
Right Record Source
MIC
CD_R
Muted
AUX_R
LINE_IN_R
Stereo Mix (R)
Mono Mix
PHONE_IN
RECORD GAIN REGISTER
Index 0x1C
Reg No. Name
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Default
0x1C
Record Gain IM X
X
X
LIM3 LIM2 LIM1 LIM0 RM¹ X X X RIM3 RIM2 RIM1 RIM0 0x8000
1 _{For AC ’97 compatibility, Bit D7 (RM) is available only by setting the MSPLT bit, Register 0x76. The MSPLT bit enables separate mute bits for the left and right channels.}
If MSPLT is not set, the RM bit has no effect.
All registers are not shown, and bits containing an X are assumed to be reserved. Refer to Table 24 for examples.
Table 25.
Bit
RIM [3:0]
RM
Mnemonic
Right Input Mixer Gain
Control
Right-Channel Mute
LIM [3:0]
IM
Left Input Mixer Gain
Control
Input Mute
Function
Each LSB represents 1.5 dB, 0000 = 0 dB, and the gain range is 0 dB to 22.5 dB.
Once enabled by the MSPLT bit in Register 0x76, this bit mutes the right channel separately from the
IM bit. Otherwise, this bit always reads 0 and has no affect when set to 1.
Each LSB represents 1.5 dB, 0000 = 0 dB, and the gain range is 0 dB to 22.5 dB.
When this bit is set to 1, both the left and right channels are muted, unless the MSPLT bit in
Register 0x76 is set to 1, in which case this mute bit affects only the left channel.
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