wm9707scft-v Wolfson Microelectronics plc, wm9707scft-v Datasheet - Page 26

• Manufacturer Part Number: wm9707scft-v
• Description: Ac?97 Revision 2.1 Audio Codec With Spdif Output
• Manufacturer: Wolfson Microelectronics plc

WM9707
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Table 8 Record Select Register Function
RECORD GAIN REGISTERS (INDEX 1Ch)
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. 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 9 Record Gain Register Function
GENERAL PURPOSE REGISTER (INDEX 20h)
This register is used to control several miscellaneous functions of the WM9707.
Below is a summary of each bit and its function. Only the 3D, MIX, MS and LPBK bits are supported
by the WM9707. 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 0000h which is all off.
Table 10 General Purpose Register Function
3D CONTROL REGISTER (INDEX 22h)
This register is used to control the centre and/or depth of the 3D stereo enhancement function built
into of the AC’97 component. Only the depth bits DP0 to 3 have effect in the WM9707.
MUTE
SR2 TO SR0
(DECIMAL)
DP3…DP0
0
0
1
RLBK
LPBK
LLBK
POP
MIX
MS
BIT
ST
3D
LD
15
0
1
2
3
4
5
6
7
0
1
8
-
-
GX3...GX0
(BINARY)
xxxxx
1111
0000
Mic
CD in (R)
Video in (R)
Aux in (R)
Line in (R)
Stereo mix (R)
Mono mix
Phone
RIGHT RECORD SOURCE
FUNCTION
PCM out path and mute, 0 = pre-3D, 1 = post-3D
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
Typical value
DEPTH
100%
0%
FUNCTION
+22.5dB gain
0dB gain
-
∞
dB gain
SL2 TO SL0
0
1
2
3
4
5
6
7
∞
dB.
LEFT RECORD SOURCE
Mic
CD in (L)
Video in (L)
Aux in (L)
Line in (L)
Stereo mix (L)
Mono mix
Phone
PD, Rev 4.4, March 2009
SUPPORT
WM9707
Production Data
Yes
Yes
Yes
Yes
Yes
No
No
No
No
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