WM9710

Production Data

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PD Rev 4.0 December 2003

21

MUTE

PV3...PV0

FUNCTION

0

0000

0dB attenuation

0

1111

45dB attenuation

1

xxxx

Table 6 PC-beep Register Function

ANALOGUE MIXER INPUT GAIN REGISTERS (INDEX 0CH - 18H AND 72H)

This controls the gain/attenuation for each of the analogue inputs and mixer PGA. 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 -

channels is fixed at 0dB. Writes to the gain control bits for these channels are ignored, and the

value of readback for these registers is always the default, with the exception of the mute bit 15

which may be written to and read from.

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

GX4...GX0

FUNCTION

0

00000

+12dB gain

0

01000

0dB gain

0

11111

-34.5dB gain

1

xxxxx

-

Table 7 Mixer Gain Control Register Function

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 8008h, which corresponds to 0dB gain with mute on.

RECORD SELECT CONTROL REGISTER (INDEX 1AH)

Used to select the record source independently for right and left (see Table 8). The default value

is 0000h, which corresponds to Mic in. Setting Bit ADCNDAC in Register 5Ch selects a stereo mix

WITHOUT DAC when (5 x 2 – 5 x 0) is 5.

SR2 TO SR0

RIGHT RECORD SOURCE

SL2 TO SL0

LEFT RECORD SOURCE

0

Mic

0

Mic

1

CD in (R)

1

CD in (L)

3

Line in (R)

4

Line in (L)

4

Stereo mix (R)

5

Stereo mix (L)

5

Mono mix

6

Mono mix

6

Phone

7

Phone

Table 8 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.

MUTE

GX3...GX0

FUNCTION

0

1111

+22.5dB gain

0

0000

0dB gain

1

xxxxx

-

Table 9 Record Gain Register Function

GENERAL PURPOSE REGISTER (INDEX 20H)

This register is used to control several miscellaneous functions of the WM9710.