Production Data

WM9701A

WOLFSON MICROELECTRONICS LTD.

PD Rev 3.2 January 2001

17

MUTE

PV3...PV0

FUNCTION

0

0000

0dB attenuation

0

1111

45dB attenuation

1

xxxx

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.

MUTE

GX4...GX0

FUNCTION

0

00000

+12dB gain

0

01000

0dB gain

0

11111

-34.5dB gain

1

xxxxx

-

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.

SR2 -SR0

RIGHT

RECORD

SOURCE

SL2-SL0

LEFT RECORD SOURCE

0

Mic

0

Mic

1

CD in (R)

1

CD in (L)

2

Video in (R)

2

Video in (L)

3

Aux in (R)

3

Aux in (L)

4

Line in (R)

4

Line in (L)

5

Stereo mix (R)

5

Stereo mix (L)

6

Mono mix

6

Mono mix

7

Phone

7

Phone

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.

MUTE

GX3...GX0

FUNCTION

0

1111

+22.5dB gain

0

0000

0dB gain

1

xxxxx

-

Table 6 Record Gain Register Function