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參數(shù)資料
| 型號： | WM9703 |
| 廠商： | Wolfson Microelectronics |
| 英文描述： | TVS UNIDIRECT 400W 22V SMA |
| 中文描述： | AC97音頻編解碼器2.1版 |
| 文件頁數(shù)： | 22/30頁 |
| 文件大小： | 239K |
| 代理商： | WM9703 |
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WM9703
Production Data
WOLFSON MICROELECTRONICS LTD
PD Rev 3.4 January 2001
22
Support for the MSB of the volume level is not provided by the WM9703. If the MSB is written to,
then the WM9703 detects when that bit is set and sets all 4 LSBs to 1s.
Example: If the driver writes
a 1xxxxx the WM9703 interprets that as x11111. It will also respond when read with x11111 rather
than 1xxxxx, the value written to it. The driver can use this feature to detect if support for the 6th bit is
there or not.
The default value of both the mono and the stereo registers is 8000h (1000 0000 0000 0000), which
corresponds to 0dB gain with mute on.
MUTE
0
0
0
1
MX4...MX0
0 0000
0 0001
1 1111
x xxxx
FUNCTION
0dB attenuation
1.5dB attenuation
46.5dB attenuation
∞
dB attenuation
Table 10 Volume Register Function
MASTER TONE CONTROL REGISTERS (INDEX 08h)
Optional register for support of tone controls (bass and treble). The WM9703 does not support bass
and treble and writing to this register will have no effect. Reading will result in all don
’
t care values.
PC BEEP REGISTER (INDEX 0Ah)
This controls the level for the PC-beep input. Each step corresponds to approximately 3dB of
attenuation. The MSB of the register is the mute bit. When this bit is set to 1 the level for that
channel is set at -
dB.
WM9703 defaults to the PC-beep path being muted, so an external speaker should be provided
within the PC to alert the user to power on self-test problems.
MUTE
0
0
1
PV3...PV0
0000
1111
xxxx
FUNCTION
0dB attenuation
45dB attenuation
∞
dB attenuation
Table 11 PC-beep Register Function
ANALOGUE MIXER INPUT GAIN REGISTERS (INDEX 0Ch - 18h)
This controls the gain/attenuation for each of the analogue inputs. Each step corresponds to
approximately 1.5dB. The MSB of the register is the mute bit. When this bit is set to 1 the level for
that channel is set at -
dB.
REGISTER 0Eh (MIC VOLUME REGISTER)
This has an extra bit that is for a 20dB boost. When bit 6 is set to 1 the 20dB boost is on. The default
value is 8008, which corresponds to 0dB gain with mute on.
The default value for the mono registers is 8008h, which corresponds to 0dB gain with mute on. The
default value for stereo registers is 8808h, which corresponds to 0dB gain with mute on.
MUTE
0
0
0
1
GX4...GX0
00000
01000
11111
XXXXX
FUNCTION
+12dB gain
0dB gain
-34.5dB gain
-
∞
dB gain
Table 12 Mixer Gain Control Register Function
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| WM9712L | AC97 Audio and Touchpanel CODEC |
| WM9712LEFL | AC97 Audio and Touchpanel CODEC |
| WM9712LEFT | AC97 Audio and Touchpanel CODEC |
| WM9712LEFV | AC97 Audio and Touchpanel CODEC |
| WM9712LSEFL | AC97 Audio and Touchpanel CODEC |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| WM9703CFT/V | 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:AC97 Revision 2.1 Audio Codec |
| WM9704CFT/V | 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:4-Channel Surround Sound Codec |
| WM9704M | 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:AMC97 Audio and Modem Codec |
| WM9704Q | 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:4-Channel Surround Sound Codec |
| WM9705 | 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:Multimedia AC97 CODEC with Integrated Touch Screen Controller |
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