ADSP-1981BL AD [Analog Devices], ADSP-1981BL Datasheet - Page 19

• Manufacturer Part Number: ADSP-1981BL
• Description: AC 97 SoundMAX Codec
• Manufacturer: AD [Analog Devices]

RECORD SELECT CONTROL REGISTER
Index 0x1A
Reg No.
0x1A
Table 23.
Bit
RS [2:0]
LS [2:0]
Table 24. Settings for Record Select Control
LS [10:8]
000
001
010
011
100
101
110
111
RECORD GAIN REGISTER
Index 0x1C
Reg No.
0x1C
1
Table 25.
Bit
RIM [3:0]
RM
LIM [3:0]
IM
All registers are not shown, and bits containing an X are assumed to be reserved.
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.
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.
Name
Record Gain
Name
Record Select
Mnemonic
Right Input Mixer Gain
Control
Right-Channel Mute
Left Input Mixer Gain
Control
Input Mute
Function
Right Record Select
Left Record Select
D15
IM
D15
X
D14
X
D14
X
Left Record Source
MIC
CD_L
Muted
AUX_L
LINE_IN_L
Stereo Mix (L)
Mono Mix
PHONE_IN
D13
X
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.
D13
X
D12
X
D12
X
D11
LIM3
D11
X
D10
LIM2
Rev. A | Page 19 of 32
D10
LS2
D9
LIM1
D9
LS1
RS [2:0]
000
001
010
011
100
101
110
111
D8
LIM0
D8
LS0
D7
RM
D7
X
1
D6
X
D6
X
D5
X
D5
X
D4
X
D4
X
D3
RIM3
D3
X
Right Record Source
MIC
CD_R
Muted
AUX_R
LINE_IN_R
Stereo Mix (R)
Mono Mix
PHONE_IN
D2
RIM2
D2
RS2
D1
RIM1
D1
RS1
AD1981BL
RIM0
D0
D0
RS0
Default
0x0000
Default
0x8000