參數(shù)資料
型號(hào)： ADSP-1981BL
廠商： Analog Devices, Inc.
元件分類： Codec
英文描述： AC 97 SoundMAX Codec
中文描述： 交流97 SoundMAX編解碼器
文件頁數(shù)： 20/32頁
文件大?。?/td> 326K
代理商： ADSP-1981BL
AD1981BL
Table 26. Settings for Record Gain Register
Reg. 0x76
Rev. A | Page 20 of 32
Control Bits Record Gain (1Channel)
Left-Channel Input Mixer D [11:8]
Write
1111
0000
XXXX
Right-Channel Input Mixer D [3:0]
Write
1111
0000
XXXX
MSPLT
1
0
0
0
D15
0
0
1
Readback
1111
0000
XXXX
Function
22.5 dB Gain
0 dB Gain
∞ dB Gain,
Muted
22.5 dB Gain
D7
1
X
X
X
Readback
1111
0000
XXXX
Function
22.5 dB Gain
0 dB Gain
∞ dB Gain,
Muted
∞ dB Gain,
Right Only
Muted
22.5 dB Gain
1
0
1111
1111
1
XXXX
XXXX
1
1
XXXX
XXXX
∞ dB Gain,
Left Only
Muted
∞ dB Gain,
Left Muted
0
1111
1111
1
1
XXXX
XXXX
1
XXXX
XXXX
∞ dB Gain,
Right Muted
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.
X is a wild card, and has no effect on the value.
GENERAL-PURPOSE REGISTER
Index 0x20
Reg No.
0x20
This register should be read before writing to generate a mask for only the bit(s) that need to be changed.
All registers are not shown, and bits containing an X are assumed to be reserved.
Table 27.
Bit
Mnemonic
Function
LPBK
Loopback Control
ADC/DAC Digital Loopback Mode.
0 = No Loopback (default).
1 = Loopback PCM Digital Data from ADC Output to DAC.
MS
MIC Select
Selects mono MIC input.
0 = Select MIC1.
1 = Select MIC2.
See the 2CMIC bit in Register 0x76 to enable stereo microphone recording.
MIX
Mono Output Select
Selects mono output audio source.
0 = Mixer Mono Output (reset default).
1 = MIC1 Channel.
Name
General-Purpose
D15
X
D14
X
D13
X
D12
X
D11
X
D10
X
D9
MIX
D8
MS
D7
LPBK
D6
X
D5
X
D4
X
D3
X
D2
X
D1
X
D0
X
Default
0x0000
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