參數(shù)資料
型號： AD1888
廠商： Analog Devices, Inc.
英文描述： FICHIER ROUGE
中文描述： 交流97 SoundMAX編解碼器
文件頁數(shù)： 21/32頁
文件大?。?/td> 312K
代理商： AD1888
REV. 0
AD1888
–21–
CNT[5:0]
Center Volume Control
CM
Center Volume Mute. When this bit is set to 1, the channel is muted.
LFE[5:0]
LFE Volume Control
LM
LFE Volume Mute. When this bit is set to 1, the channel is muted.
CENTER/LFE Volume Control Register (Index 36h)
Reg
No. Name
D15 D14
D13
*
D12
D11
D10
D9
D8
D7
D6
D5
*
D4
D3
D2
D1
D0
Default
36h Center/LFE
Volume
LM
X
LFE5
LFE4
LFE3
LFE2
LFE1
LFE0
CM
X
CNT5 CNT4 CNT3 CNT2
CNT1 CNT0 8080h
All registers not shown and bits containing an X are assumed to be reserved.
Refer to Table VII for examples. This register controls the LFE output volume and mute bit. The volume registers contain five bits, generating
32 volume levels with 31 steps of 1.5 dB each. If MSPLT is not set, Bit D7 has no effect.
*
Because AC ’97 defines 6-bit volume registers, to maintain compatibility, whenever the D5 or D13 bit is set to 1, its 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 this bit is set to 1.
Note that depending on the state of the AC97NC bit in Register 76h, this register operates as follows:
For AC97NC = 0, the register controls the center and LFE output pin attenuators. Range is 0 dB to –46.5 dB.
For AC97NC = 1, the register controls the center and LFE DAC gain/attenuators. Range is +12 dB to –34.5 dB.
Table VII. Settings for Center/LFE Register
Control Bits
CENTER and LFE Volume (36h)
CENTER D[5:0] and LFE D[13:8]
WRITE
00 0000
00 1111
01 1111
1x xxxx
xx xxxx
D15/D7
READBACK
00 0000
00 1111
01 1111
01 1111
xx xxxx
Function with AC97NC = 0
Function with AC97NC = 1
0
0
0
0
1
0 dB Gain
–22 dB Gain
–46.5 dB Gain
–46.5 dB Gain
Muted
12 dB Gain
–10.5 dB Gain
–34.5 dB Gain
Not Applicable
Muted
Surround Volume Control Register (Index 38h)
Reg
No.
Name
D15
D14 D13
*
D12
D11
D10
D9
D8
D7
D6
D5
*
D4
D3
D2
D1
D0
Default
38h
Surround
Volume
MUTE_L X
LSR5 LSR4 LSR3 LSR2
LSR1 LSR0
MUTE_R X
RSR5 RSR4 RSR3 RSR2
RSR1
RSR0 8080h
*
Refer to Table VIII for examples. This register controls the surround volume controls for both stereo channels and mute bits. 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 Bit is set to 1, its respective lower five volume bits are automatically set to 1 by the coded logic. On readback, all lower five bits will read 1s whenever these
bits are set to 1.
Note that depending on the state of the AC97NC bit in Register 76h, this register operates as follows:
For AC97NC = 0, the register controls the surround output pin attenuators. Range is 0 dB to –46.5 dB.
For AC97NC = 1, the register controls the surround DAC gain/attenuators. Range is +12 dB to –34.5 dB.
RSR[5:0]
Right Surround Volume Control
MUTE_R
Right Surround Volume Mute. When this bit is set to 1, the right channel is muted.
LSR[5:0]
Left Surround Volume Control
MUTE_L
Left Surround Volume Mute. When this bit is set to 1, the left channel is muted.
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