參數(shù)資料
型號： AD1981BLJSTZ2
廠商： Analog Devices, Inc.
元件分類： Codec
英文描述： AC ’97 SoundMAX㈢ Codec
中文描述： ㈢交流\u0026#39;97 SoundMAX編解碼器
文件頁數(shù)： 11/28頁
文件大?。?/td> 215K
代理商： AD1981BLJSTZ2
REV. 0
AD1981BL
–11–
Headphones Volume Register (Index 04h)
*
For AC ’97 compatibility, Bit D7 (RM) is available only by setting the MSPLT bit, Register 76h. The MSPLT bit enables separate mute bits for the left and right
channels. If MSPLT is not set, RM bit has no effect. All registers not shown, and bits containing an X are assumed to be reserved.
Refer to Table I for examples. This register controls the headphone volume controls for both stereo channels and mute bit. Each
volume subregister contains five bits, generating 32 volume levels with 31 steps of 1.5 dB each. Because AC ’97 defines 6-bit volume
registers, to maintain compatibility, whenever the D5 or D13 bits are set to 1, their respective lower five volume bits are automati-
cally set to 1 by the codec logic. On readback, all lower five bits will read 1s whenever these bits are set to 1.
RHV [4:0]
Right Headphone Volume Control. The least significant bit represents 1.5 dB. This register controls the output
from 0 dB to a maximum attenuation of 46.5 dB.
RM
Right Channel Mute. Once enabled by the MSPLT bit in Register 76h, this bit mutes the right channel separately
from the HPM bit. Otherwise, this bit will always read 0 and will have no effect when set to 1.
LHV [4:0]
Left Headphone Volume Control. The least significant bit represents 1.5 dB. This register controls the output
from 0 dB to a maximum attenuation of 46.5 dB.
HPM
Headphones Volume Mute. When this bit is set to 1, both the left and right channels are muted, unless the
MSPLT bit in Register 76h is set to 1, in which case this mute bit will affect only the left channel.
Table I. Volume Settings for Master and Headphone
Control Bits
Reg. 76h
MSPLT
*
Master Volume (02h) and Headphone Volume (04h)
Left Channel Volume D[13:8]
Readback
Function
Right Channel Volume D[5:0]
Write
Readback
D15 Write
D7
*
Function
0
0
00 0000
00 0000
0 dB Gain
x
00 0000
00 0000
0 dB Gain
0
0
00 1111
00 1111
–22.5 dB Gain
x
00 1111
00 1111
–22.5 dB Gain
0
0
01 1111
01 1111
–46.5 dB Gain
x
01 1111
01 1111
–46.5 dB Gain
0
0
1x xxxx
01 1111
–46.5 dB Gain
x
1x xxxx
01 1111
–46.5 dB Gain
0
1
xx xxxx
xx xxxx
– dB Gain, Muted
x
xx xxxx
xx xxxx
– dB Gain, Muted
1
0
1x xxxx
01 1111
–46.5 dB Gain
1
xx xxxx
xx xxxx
– dB Gain, Right
Only Muted
1
1
xx xxxx
xx xxxx
– dB Gain, Left Only Muted
0
xx xxxx
xx xxxx
–46.5 dB Gain
1
1
xx xxxx
xx xxxx
– dB Gain, Left Muted
1
xx xxxx
xx xxxx
– dB Gain, Right
Muted
*
For AC ’97 compatibility, Bit D7 (RM) is available only by setting the MSPLT bit, Register 76h. The MSPLT bit enables separate mute bits for the left and right
channels. If MSPLT is not set, RM bit has no effect.
x in the above table is a wild card and has no effect on the value.
Reg
No. Name
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
Default
04h Headphone HPM
Volume
X
X
LHV
4
LHV
3
LHV
2
LHV
1
LHV
0
RM
*
X
X
RHV
4
RHV
3
RHV
2
RHV
1
RHV
0
8000h
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