wm9701acftv Wolfson Microelectronics plc, wm9701acftv Datasheet - Page 17

• Manufacturer Part Number: wm9701acftv
• Description: Power Ac97 Multimedia Audio Codec
• Manufacturer: Wolfson Microelectronics plc

Production Data
WOLFSON MICROELECTRONICS LTD.
Table 3 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 -
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.
Table 4 Mixer Gain Control Register Function
RECORD SELECT CONTROL REGISTER (INDEX 1Ah)
Used to select the record source independently for right and left. (see Table 5 for legend). The
default value is 0000h, which corresponds to Mic in.
Table 5 Record Select Register Function
RECORD GAIN REGISTERS (INDEX 1Ch AND 1Eh)
1Ch is for the stereo input and 1Eh is for the optional special purpose correlated audio Mic channel.
Each step corresponds to 1.5dB. 22.5dB corresponds to 0F0Fh and 000Fh respectively. 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 -
The default value is 8000h, which corresponds to 0dB gain with mute on.
Table 6 Record Gain Register Function
0
0
1
0
0
0
1
0
1
2
3
4
5
6
7
0
0
1
MUTE
MUTE
SR2 -SR0
MUTE
00000
01000
11111
xxxxx
dB.
0000
1111
xxxx
GX4...GX0
Mic
CD in (R)
Video in (R)
Aux in (R)
Line in (R)
Stereo mix (R)
Mono mix
Phone
1111
0000
xxxxx
GX3...GX0
PV3...PV0
RECORD
SOURCE
RIGHT
+12dB gain
0dB gain
-34.5dB gain
-
0
1
2
3
4
5
6
7
+22.5dB gain
0dB gain
-
FUNCTION
SL2-SL0
dB gain
dB gain
0dB attenuation
45dB attenuation
dB attenuation
Mic
CD in (L)
Video in (L)
Aux in (L)
Line in (L)
Stereo mix (L)
Mono mix
Phone
FUNCTION
LEFT RECORD SOURCE
FUNCTION
PD Rev 3.2 January 2001
WM9701A
dB.
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