WM9705_06 WOLFSON [Wolfson Microelectronics plc], WM9705_06 Datasheet - Page 32

• Manufacturer Part Number: WM9705_06
• Manufacturer: WOLFSON [Wolfson Microelectronics plc]

WM9705
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Table 11 Record Select Register Function
RECORD GAIN REGISTERS (INDEX 1Ch)
1Ch sets the stereo input record gain with each step corresponding to 1.5dB. The MSB of the
register is the mute bit. When this bit is set to 1, the level for both channels is set at -
The default value is 8000h, which corresponds to 0dB gain with mute on.
Table 12 Record Gain Register Function
GENERAL PURPOSE REGISTER (INDEX 20h)
This register is used to control several miscellaneous functions of the WM9705.
Below is a summary of each bit and its function. Only the POP, 3D, MIX, MS and LPBK bits are
supported by the WM9705. 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.
3D CONTROL REGISTER (INDEX 22h)
This register is used to control the centre and/or depth of the 3D stereo enhancement function
built into the AC’97 component. Only the depth bits DP0 to 3 have effect in the WM9705.
Table 13 3D Control Register
POWERDOWN CONTROL/STATUS REGISTER (INDEX 26h)
This read/write register is used to program power-down states and monitor subsystem readiness.
The lower half of this register is read only status, a 1 indicating that the subsection is ready.
Ready is defined as the subsection able to perform in its nominal state. When this register is
written the bit values that come in on AC-link will have no effect on read bits 0- 7.
MUTE
LPBK
SR2 TO SR0
POP
MIX
MS
BIT
3D
0
0
1
DP3…DP0
0
1
2
3
4
5
6
7
15
0
1
8
-
-
PCM out path and mute, 0 = pre-3D, 1 = post-3D
3D stereo enhancement on/off, 1 = on
Mono output select 0 = Mix, 1 = Mic
Mic select 0 = Mic1, 1 = Mic2
ADC/DAC loopback mode
GX3...GX0
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
FUNCTION
+22.5dB gain
0dB gain
-
∞
dB gain
Typical value
DEPTH
100%
0%
SL2 TO SL0
0
1
2
3
4
5
6
7
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 August 2006
Production Data
∞
dB.
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