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參數(shù)資料
| 型號： | XWM9708CDS |
| 廠商： | Wolfson Microelectronics |
| 元件分類： | Codec |
| 英文描述： | AC97 Revision 2.1 Audio Codec |
| 中文描述： | AC97音頻編解碼器2.1版 |
| 文件頁數(shù)： | 21/28頁 |
| 文件大?。?/td> | 205K |
| 代理商： | XWM9708CDS |
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Advanced Information
WM9708
WOLFSON MICROELECTRONICS LTD
AI Rev 2.0 April 2001
21
SR2 TO SR0
0
1
2
3
4
5
6
7
Table 7 Record Select Register Function
RIGHT RECORD SOURCE
Mic
CD in (R)
Not supported
Not supported
Line in (R)
Stereo mix (R)
Mono mix
Phone
SL2 TO SL0
0
1
2
3
4
5
6
7
LEFT RECORD SOURCE
Mic
CD in (L)
Not supported
Not supported
Line in (L)
Stereo mix (L)
Mono mix
Phone
RECORD GAIN REGISTERS (INDEX 1Ch)
1Ch is for the stereo input. Each step corresponds to 1.5dB. 22.5dB corresponds to 0F0Fh. The MSB
of the register is the mute bit. When this bit is set to 1, the level for that channel(s) is set at -
dB.
The default value is 8000h, which corresponds to 0dB gain with mute on.
MUTE
0
0
1
Table 8 Record Gain Register Function
GX3...GX0
1111
0000
xxxxx
FUNCTION
+22.5dB gain
0dB gain
-
∞
dB gain
GENERAL PURPOSE REGISTER (INDEX 20h)
This register is used to control several miscellaneous functions of the WM9708.
Below is a summary of each bit and its function. Only the MIX, MS and LPBK bits are supported by
the WM9708. The MS bit controls the Mic selector. The LPBK bit enables loopback of the ADC
output to the DAC input without involving the AC-link, allowing for full system performance
measurements. The function default value is 8000h which is all off.
BIT
FUNCTION
WM9708
SUPPORT
Yes
No
No
No
No
No
Yes
Yes
Yes
POP
ST
3D
LD
LLBK
RLBK
MIX
MS
LPBK
PCM out path and mute
Simulated stereo enhancement, on/off 1 = on
3D stereo enhancement on/off, 1 = on
Loudness (bass boost) on/off, 1 = on
Local loop back - for modem, line codec
Remote loop back - for modem, line codec
Mono output select 0 = Mix, 1 = Mic
Mic select 0 = Mic1, 1 = Mic2
ADC/DAC loopback mode
Table 9 General Purpose Register Function
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